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Forum: Pentax DSLR Discussion 02-13-2012, 03:59 PM  
Why do people want a Full Frame sensor?
Posted By normhead
Replies: 98
Views: 11,799
That's not why I posted the link, I posted the link because of

And i would assume even tighter control of DoF, and professional appearance...
I'm just curious , most of the things people say they have to have FF for are done better by the 645D, so I'm curious, why pick FF as your stopping point. Why not go all the way?. God knows I've said forever it's not about the pictures.




Affordable is the problem. Apparently it's much easier to produce large size film than large size sensors, and it's pay up front. With digital you pay for all the "film" you will ever use when you buy the camera. Lose the camera and you've lost 100,000 exposures of film. With film the camera is relatively cheap and you pay for film as you go along. Probably more expensive in teh long run, but it never takes the huge bite out of your wallet.



Makes you wonder, given the above statement, exactly how much of the cost of 645D is the sensor? 1/3 to half would be reasonable guesses.



Class A

with all due respect... you can have all those "advantages" and it can make not one bit of difference to the image. It may be that if you shoot a certain style you may need all or one of those advantages...


HIgher than a K-5? wow,



No but you can get 85.1.4 for your APS-C but not the equivalent 135 1.4 for your FF. This kind of argument always pretends like FF is always at an advantage. Sometimes, my depth of field is perfect at 50 and 1.4 mm on an APS-c camera, and using the same lens on an FF system would simply mean cropping the image to APS-c size. No one has done any analysis to show whether you come out on top using an FF or APS-c system. Everyone who uses an FF system seems to like it, I'm not saying it has no value. But is it necessary?

jsherman pointed me to an argument that pointed out "your best lens on APS-c isn't as good as your wort lens on FF", a point the author demsontrated, with 1 on 1 pixel peeping. That's the only way to see the difference. Some of us would argue that's just not relevant.

Price is an issue.... for most of us.



In what way is that incorrect? DoF is measurable, there can be more or less of it, it is the distance between the nearest and furthest points in acceptable focus, distance, as in, there can be more or less of it. An FF can achieve less DoF, but you have to want less DoF to make that worth paying even 10 cents for. . That's just plain fact. Again, in any situation. Shooting with your renowned 50 1.4 on FF or APS-c you have the same DoF. The only issue is what camera's DoF is more appropriate to the picture being taken. Based on my shooting style, 95% of the time I would prefer more DoF to less, which would mean 95% of the time I would be happier using an APS-c camera. Your shooting style may differ, but, what I'm saying is there is no intrinsic advantage to FF, it's different not better, accept with pixel peepers. The fact that theoretically there could be an advantage to shooting FF, doesn't mean that there is, or that you'd ever run into a situation where there wasn't an acceptable workaround. You can get all caught up in theory and imagine things to be really important, that aren't.



In practical terms... if you can take the same image with an Optio W90... for that image, yes it makes my W90 equal to the 645D, and if that's the picture I need, taking it with a 645D instead of your optio 90 would border on insanity. Not in terms of the pride you take in your equipment, or oneupmanship in the forum... but in terms of that image at that size. I'm not at all concerned with theoretical minutiae. I will always make use of the best equipment I own for a specific shot, just on the odd chance I might need a better image quality of higher resolution or whatever. However if APS-c continues to be good enough...and no one can tell if my images were shot with APS-c, FF or MF for that matter, I'm not going more expensive. I'll bet that APS-c FF and MF at 1:2 crop are pretty much indistinguishable, for most images. And that the differences that are an advantage in one situation are a disadvantage in another.

There is just one valid question here.

Do I need less depth of field. If the answer is yes go FF although you should also look at MF too, if you need more DoF, save yourself the grief, stay with APS-c.
Do I need the maximum in sharp images at more than 2500 wide pixels on a computer monitor? If yes, go FF or MF. If 2500 or less, APS-c is good enough and the pictures will be indistinguishable.

Assuming you can get a good print at say 120 DPI.. which I'd go with, my own personal rule of thumb, but probably a bit conservative, .. am I going to print these images over 40 inches in width?
If the answer is yes, you may need to go FF or MF. By my rule of thumb an MF 645 D would get me to about 60 inches.

The parameters for actually "needing" FF are so small as to defy assigning a % to the numbers of photographers who need them.

ANd as well many times limitations of a particular system can be overcome. FOr example, meeting pixel count limitations by taking multiple exposures , stitching your images together and achieving sharpness by reducing the huge image size. Even thinking you "need" FF doesn't mean their may not be work around for the few times you actually do require it.
Forum: General Talk 08-12-2011, 01:08 PM  
Can Someone Please Explain To Me Why London Has Gone Mad?
Posted By Laurentiu Cristofor
Replies: 78
Views: 8,749
An article I've seen today:

London police say nearly 600 charged over riots

Instead of looking for the causes of this mess, the UK government is back to awarding itself more police powers. I got this image of a man amputating his limbs while insisting that he's perfectly healthy - it's only some of his limbs that were sick. Now that is sick.
Forum: General Talk 08-10-2011, 01:18 PM  
Can Someone Please Explain To Me Why London Has Gone Mad?
Posted By Talisker
Replies: 78
Views: 8,749
Fortunately things seem fairly quiet this evening. Yesterday we had to 'evacuate' our workplace by 5pm due to specific intelligence of serious unrest in the area (suburban north-west London) which fortunately didn't materialise. No trouble local to home, although the area round the corner from where I lived in the 90s was trashed on Monday night...

There's a whole melange of things going on. There are those in some communities who feel victimised by authority. There's an underclass who have, or more importantly, feel that they have been abandoned, and feel agrieved with society at large. The growing wealth gap between those at the top and the bottom doesn't help, even if much of it is a 'super elite' breaking away from the rest of us. Neither does the increasingly materialistic society where the concept of a 'status symbol' has been taken to ridiculous extremes, but the desperation for status and acceptance by peers drives the desires. There's the copycat opportunists who having seen what is happening in London think they can get away with a bit of acquisitive disorder. Couple this with the 'me, now', instant gratification, feeling of entitlement that has somehow permiated society and there's a bomb waiting to go off. There are no simple reasons and there will be no quick, simple answers.

Something else to throw into the pot. Notice the people who are now appearing in court. Not just the 'hoodrats' (many of whom will have got away because they are more practiced at this behavior!) and career criminals, but those with reasonable jobs who couldn't resist helping themselves when the opportunity arose, because they had to have that little bit more something for nothing and have probably blighted the rest of their own lives as a result. Maggie's little children have grown up – and it ain't pretty...
Forum: Lens Clubs 06-04-2011, 08:10 PM  
The Tammy Club!
Posted By BlackRockBacon
Replies: 2,923
Views: 558,014
Nice Photos christopherf....that first one is a very interesting angle...what car is that?

I have another photo of Antelope Canyon with my 17-50...this lens has really served me well since I bought it last December.

K-5
17-50 @ 28mm
ISO 80
f/11
5 bracketed exposures merged in Photomatix 4
Edited the .tif in LR 3.4


Untitled by BlackRockBacon, on Flickr

and Here is the same Photo, but with a B&W treatment.
Converted to B&W in Lr 3.4
took it into Silver Efex Pro to boost the structure and contrast a little
then made more little adjustments in LR 3 until I got this.


Lower Antelope Canyon by BlackRockBacon, on Flickr

More to come as I finish sifting through and editing all the photos from this outing.
Forum: General Talk 05-06-2011, 11:17 PM  
Running Thread of Catharsis
Posted By shooz
Replies: 54
Views: 6,954
For a while. Then it gets worse.
I prefer a nice bowl of mushrooms.
Those last ones made me feel funny though.
I hope it doesn't affect my photography.
Nice and sharp.
Something doesn't look right.
WTF?
Forum: General Talk 05-04-2011, 08:49 AM  
What is Fascism
Posted By audiobomber
Replies: 91
Views: 12,088
Fascism in America won't come with jackboots, book burnings, mass rallies, and fevered harangues, nor will it come with black helicopters or tanks on the street. It won't come like a storm, but as a break in the weather, that sudden change of season you might feel when the wind shifts on an October evening: Everything is the same, but everything has changed. Something has gone, departed from the world, and a new reality will have taken its place. All the old forms will still be there: legislatures, elections, campaigns, plenty of bread and circuses. But "consent of the governed" will no longer apply; actual control of the state will have passed to a small and privileged group who rule for the benefit of their wealthy peers and corporate patrons.
--------
The rulers will act in secret, for reasons of "national security", and the people will not be permitted to know what goes on in their name. Actions once unthinkable will be accepted as routine: government by executive fiat, state murder of "Enemies" selected by the leader, undeclared wars, torture, mass detentions without charge, the looting of the national treasury, the creation of huge new "security structures" targeted at the populace. In time, this will be seen as "normal", as the chill of autumn feels normal when summer is gone. It will all seem normal.

--Chris Floyd, November 10, 2001

____________________________________________________________________________

It appears to me the Bush/Cheney/Rumsfeld government was well on the way to fascism.
Forum: Photographic Industry and Professionals 04-28-2011, 08:08 AM  
My Shoot with Model-Actress Amber Anderson in Harper's BAZAAR & Video
Posted By benjikan
Replies: 16
Views: 7,835
If any of you are interested, I have posted my new 12 page fashion spread for Harper's BAZAAR en Español, May 2011 Issue, with Model-Actress Amber Anderson who is appearing with Natalie Portman in the new film coming out shortly, "Your Highness"

Benjamin Kanarek Blog | Benjamin Kanarek Blog.
Forum: Photo Critique 04-15-2011, 05:58 PM  
People Comic book/noir style
Posted By Metalwizards
Replies: 8
Views: 3,040
Let me know what you all think of this one. I am pretty happy with it. Taken with the dal 18-50 kit lens.

Forum: Mini-Challenges, Games, and Photo Stories 04-07-2009, 10:19 AM  
Post your: 'It's just so wrong' photos here
Posted By Nesster
Replies: 330
Views: 49,094
Hey, these are very artistic shots - yeah, I love that hubcap...

Here's something that was so wrong from the start: I had the wrong lens (DA70) and the wrong camera (ZX-10 with reluctant mode switch) set on auto focus... the idea would have worked better with a wide angle, prefocused shot. Who knows, maybe even a digital camera ;)

But, I like the strangeness of it

Forum: Maintenance and Repair Articles 04-03-2011, 05:35 PM  
Lubricants
Posted By pacerr
Replies: 6
Views: 17,043
I'm going to go out on a limb here and offer some generalities that have worked well for me over the years. I most certainly invite others to contribute their experience and opinion to this topic as I have only past personal success to rely on here. As usual, every ol' f@rt will have a conflicting opinion as to what's best but eventually we reach consensus.

I've divided lubricant applications into a few functional categories:

Slow moving parts (things you move with your finger like film advance parts and aperture rings) -- a light grease often recommended for firearms and fishing tackle. Less 'sticky' than Vasoline but does not flow or noticeably thin under the heat of a light bulb or get hard in cold weather..

Fast moving parts (things that 'snap' under spring pressure like shutter drive parts, but not aperture blades) -- A very light household oil like 3-in-1, watchmakers oils, sewing machine oil and rarely, powdered graphite slurry mixed with lighter fluid.

High friction parts (like latch engagements and gear teeth under spring pressure) -- Molybdenum paste.

Aperture blades (things not under pressure but which have 'drag' against adjacent surfaces) -- NO grease or oil! Dry graphite applied by brush or in a lighter fluid slurry. If you can see grain in the graphite it's too coarse. Might be applied directly to the blades using the tip of a very soft lead pencil or rub the pencil lead against a matchbook striker strip. Gently wipe/blow out as much excess as possible after operating the parts to spread the graphite.

Helical focus and zoom threads (a viscous automotive gear or bearing grease) -- ideally you'll have some old threaded barrels to experiment with to get the correct "feel"; it mostly depends on the tolerance in the threads. Something about like extra thick Vasoline usually works OK.

Plastic parts of any kind (you know, THOSE lenses) -- Caution! organic bases and solvents may affect plastics in undesirable ways, read instructions and experiment on junk parts. Plastic-to-plastic is the one area I can recommend silicon-based lubes but light grease is still better IMO.

If a lubricant smells or feels like it might give off volatile vapors of any kind as the solvent/carrier evaporates, or under high temperatures, you can expect that it will probably deposit haze on lens elements over time.

Grease that turns 'runny' under the heat of a light bulb will surely migrate to places you don't want it to when exposed to summertime temperatures. Some older lenses were infamous for this characteristic as revealed by sticky aperture blades and internal haze.

In my experience, WD-40 and similar pressurized fluids are NOT an answer to any camera lubrication problem unless used solely as a penetrating fluid for disassembling corroded parts to be cleaned later.

If you're uncertain as to what's available to you locally, a jeweler/watch/camera repairman, a machinist, gunsmith or a modeller may offer excellent advise regarding easily available products - although you might discuss the above categories with them to ensure they understand your intended application.

A little research on "lubricant-related" search strings including automotive, firearms, fishing tackle, lathes & machining metals, sewing machines, and cameras will be well rewarded.

H2
Forum: Post Your Photos! 03-20-2011, 08:22 AM  
People Double Exposures
Posted By kevinschoenmakers
Replies: 15
Views: 4,434
Yesterday I went along with the photography club of my university, which for me turned into an experiment with double exposures. You can do these in-camera with the K-5 (and probably other cameras too). Try it sometime, it's a very, very cool feature.

More on my website.

1


2


3


4


5
Forum: General Talk 03-23-2011, 02:31 PM  
Green Jobs
Posted By normhead
Replies: 32
Views: 5,234
If you want to talk about wasted spending, why not talk military spending? Spending money on the military is a total waste that does nothing for the economy. If 2/3 of the US military were working in factories, if the RD that went in to the military were spent on R&D for green technologies and health care. Nothing wastes money like putting money in to weapons.
Forum: General Talk 03-22-2011, 02:47 PM  
Green Jobs
Posted By Ratmagiclady
Replies: 32
Views: 5,234
Well, John, that's why China is trying to find ways to *not* go there, which is more than can be said for how the US has treated any notion of anything but increased consumption of Big Oil-profitable things as somehow 'not worth it,' ...Now, what, someone projects China to be 'worse' and it makes us "OK?"


There's a difference between 'cause' and blame.

Frankly, I was saying it a long time ago, when these *other* countries start industiralizing/using lots of power, we needed to be thinking about having better ways to go about it than what we've been 'expoting' all along. They do have a chance to be smarter about it, while the US keeps insisting 'We can't afford to' do more than drive full-throttle into the ground on the unsustainable.

Same people been saying that since long before what anyone else does was out of our hands. This isn't about 'blame' for what someone might do in the future, this is about fixing things. If CHina wants to depend on coal too long without building anythign else out of it, then they're screwed, too, three times as fast. Pointing fingers and doing nothing doesn't change that.


If you want to blame someone, blame the people that have insisted on setting up the world of money this way, while stepping on all the alternatives. They'll keep on laughing all the way to the bank, of course...
Forum: Post Your Photos! 03-18-2011, 01:09 PM  
Not Work-Safe Angel Marcy
Posted By cem.kumuk
Replies: 88
Views: 20,182
In my opinion K-5 proved itself as a wonderfull tool for model photography

Forum: Troubleshooting and Beginner Help 12-06-2010, 07:27 PM  
Absolute Beginner Needs Help With Necessities. I am about to buy a Kx. :) Thanks.
Posted By Wheatfield
Replies: 37
Views: 7,813
If you can live with a lowly A50/1.7 that I have no interest in keeping as your "fast 50", I'll send you one for the cost of postage from Canada to you.
It isn't autofocus though.

I don't even recall if I've ever used it. I have no idea where I got it from, but I assure you it isn't hot, I am the legitimate owner.
Anyway, PM me if you want it.
Forum: General Talk 11-24-2010, 03:57 PM  
politicizing thanksgiving
Posted By jeffkrol
Replies: 5
Views: 2,079
Dang, I had a really good attack on how it was the Puritans (numerically overwhelming the original colonists) that subverted the colonies and really screwed the Am-ind's over........





QuoteQuote:

After 1630, the members of Plymouth Colony found themselves becoming a minority, due to the growing number of Puritans arriving and settling near present-day Boston. Barely tolerant of other Christians denominations and viewing the native peoples largely as savages and heathens, the Puritans were also soldiers and traders who had little interest in friendship or cooperation with the Indians. Under this new leadership, the English expanded westward into the Connecticut River Valley. In 1637 they destroyed the powerful Pequot Confederation. In 1643 the Mohegan defeated the Narragansett in a war; with support from the English, they became the dominant tribe in southern New England.[12]

Between 1640 and 1675, new waves of settlers arrived and continued to force the native peoples westward. While the Pilgrims had normally paid for land, or had at least asked for permission, most Puritans simply took land for themselves[citation needed]. In 1665 the Indians of southern New England were simply in the way of the English, who had no desire to learn to survive in the wilderness. Catching fish and the trading of commodities had replaced the colonists’ trading of furs and wampum from previous years. The population of the native peoples continued to decline, due to recurring epidemics in 1633, 1635, 1654, 1661 and 1667.[12]



OR how the Politicizing" (and BTW propaganda) goes on today......
How Property Rights Saved the Pilgrims After the First Thanksgiving|OpenMarket.org

Or the myths..........
OUPblog Blog Archive Thanksgiving: Behind the Pilgrim Myth
Thanksgiving - Not the Pilgrims' feast - Pratt, KS - Pratt Tribune
The "indians" of thanksgiving, lest we forget (or more likely what do you know about "them")
Wampanoag people - Wikipedia, the free encyclopedia





QuoteQuote:

After 1640, John Eliot and other Puritan missionaries proposed a "humane" solution to the Indian “problem:” converting native peoples to Christianity. The converted Indians were resettled in fourteen "praying towns." The system of organization into sedentary townships was especially important because it demanded the renunciation of native practices such as migratory hunting patterns and their adoption of a more traditionally English way of life. By settling them into established towns, Eliot and his colleagues hoped that under the tutelage of Christian ministers, Native Americans would adopt English – and therefore “civilized” – practices like monogamous marriage, agriculture, patriarchal households, and jurisprudence.[16]

The motivations of New England Native American societies, to convert to Christianity were numerous and varied. The high levels of epidemics among the Native Americans after the arrival of the Europeans certainly contributed. In addition to bringing about a dramatic restructuring of political hierarchies, the massive death toll caused a certain level of disillusionment in Native American societies. It has been suggested that the survivors experienced a type of spiritual crisis because their medical and religious leaders could not prevent the epidemic.[17] Conversely, the English settlers were often unaffected by the sickness, which contributed to a belief that the English god was more powerful than their own.
"Old Indian Meeting House," built in 1684 in Mashpee, is the oldest surviving Native American church building in the United States

In addition, by the latter half of the seventeenth century, alcoholism had become rampant among males in some southern New England ethnic groups and inspired many to turn for help to Christianity and Christian discipline systems. Thus Christianity became a refuge of women from male drunkenness. With its insistence upon temperance and systems of earthly and heavenly retribution for drunkenness, Christianity held great appeal to natives attempting to fight alcoholism, especially to those women whose close male relatives were affected.

The level of conversion to not only Christianity but also English cultural and societal norms – conversions demanded of the Native Americans – depended on the town and region. In most of Eliot's mainland “praying towns,” converts were expected to follow English laws, manners, and gender roles in addition to adopting the material trappings of English life. Rather than a system in which those who did not conform were punished, however, Eliot and other ministers relied on praise and rewards for those who did.[18]

The Christian Indian settlements of Martha's Vineyard were noted for a great deal of sharing and mixing between Wampanoag and English ways of life. Wampanoag converts often carried over cultural attributes such as dress, hairstyle, and governance. These Martha's Vineyard converts were not required to attend church and often maintained traditional cultural practices such as mourning rituals.[19] The Martha's Vineyard Christian Indian settlements were much more a mixture of Wampanoag and English Puritan cultures than only English Puritan values.

Other than religious conversion, Eliot's “praying Indians” did not experience a high degree of cultural assimilation, especially in the area of law and justice systems. In pre-colonial societies, the sachem and his or her council were responsible for administering justice among their people. However, converts increasingly turned to religious authorities for help in resolving their legal quarrels as the seventeenth and eighteenth centuries progressed. Christian ministers and missionaries supplanted traditional leaders as the legal authorities among Christian Indians.

The conversion of Native Americans to Christianity had an especially great effect on female converts. As previously discussed, many Wampanoag women were attracted to Christianity because it offered a chance to free themselves and especially their male relatives from alcohol abuse. Christianity altered the gender power structure as well. English ministers such as John Eliot attempted to introduce a patriarchal society to their Wampanoag converts, both inside and outside the home. In many cases, however, these attempts failed because Wampanoag women – especially Wampanoag wives – were, in the majority of cases on the Vineyard, the spiritual leaders of their households.[20] Additionally, they were also more likely to convert than Indian males. Experience Mayhew, a Puritan minister, observed that there were “a greater number of their women appearing pious than of the men among them.” However, this tendency towards female conversion created a problem for missionaries intent on establishing traditional patriarchal family and societal structures among the Native Americans: in order to convert the men, these Puritans often had to place power in the hands of the women. In general, English ministers agreed that it was preferable for women to subvert the patriarchal model and assume a dominant spiritual role than it was for their husbands to remain unconverted. Experience Mayhew asked “[How] can those Wives answer it unto God who do not Use their utmost Endeavors to Perswade and oblige their husbands to maintain Prayer in their families [?]”[21] Thus, the lives of some Wampanoag women changed greatly after their conversion to Christianity because the gender roles prescribed by pre-colonial society were often altered or replaced by English customs, while others remained practitioners of traditional Christianity.



for later:
http://www.mediaite.com/online/rush-limbaugh-outraged-obamas-thanksgiving-de...ive-americans/
http://www.nydailynews.com/news/politics/2010/11/25/2010-11-25_rush_limbaugh...=news/politics
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