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Forum: Photographic Technique 05-26-2012, 04:14 PM  
APS-C does not increase focal length over FF, it decreases field of view.
Posted By JimJohnson
Replies: 135
Views: 14,883
:D With rare exception, I compose based on what I see in my viewfinder. When DOF is of importance (fairly often), I shoot Av or manual and have my green button set to duplicate my old Super Program's stop-down lever. Even there, I care based on what I see, not what the math tells me is happening. So while most of this esoteric discussion is true, how many of us think about this as we are pushing the shutter release?

I remember the medium format fans explaining the same thing to 35mm camera users. This is one of those great discussions to have with fellow photographers over a pint at the pub on a dreary evening. And like a lot of those discussions, it really matters little outside those discussions.
Forum: Photographic Technique 05-25-2012, 09:42 PM  
APS-C does not increase focal length over FF, it decreases field of view.
Posted By Venturi
Replies: 135
Views: 14,883
It took me the better part of three years to get personal closure on this subject, and it didn't happen until I bought a 645 and developed that first roll of 120.

Here's the plain truth: APS-C doesn't "do" anything; it is a different format than 135 (a.k.a. full-frame).

That, in most cases, you are afforded the convenience of using 135 mount lenses on APS-C cameras is simply that - convenience.

Advanced Photo System (APS) format is the brain child of Eastman Kodak. It debuted in 1996 and is comprised of three sub-formats:
H - High-definition 16:9 aspect
C - Classic (not crop!) 3:2 aspect
P - Panorama 3:1 aspect
Calling APS-C format sensors "cropped" is quite simply marketing mumbo-jumbo.

As to magnification, well that's a matter of perspective.
I can safely argue that it isn't the lens that magnifies, but rather the recording medium - the sensor or film. 135 is approximately 2.4 times larger in area than APS-C, so doesn't it follow that the recorded image on 135 is of higher magnification than APS-C?
Or perhaps magnification doesn't pertain to the recording format at all?
Maybe it's the size of the print that defines magnification.
Or maybe it's the number of pixels in the raw digital image.
As Rico said earlier, magnification is fluid.

110, 126/127, APS-C/H/P, 135, and 120/220 are all fully independent formats. They require no legitimizing or justification to exist in the photographic world.

Once you can wrap your brain around the concept that APS-C is simply a different format, that happily often shares lens mount compatibility with 135, you will likely find more enjoyment in your photography.

More fun facts that provide zero qualitative measurement of what makes a great photograph:
  • Field of View is relative to format and distance.

  • Angle of View is relative to format and focal length.

  • Image Scale is bound to distance and focal length. It is constant across formats.

  • Snickers really satisfies.

Forum: Pentax SLR Lens Discussion 05-21-2012, 02:21 AM  
Photozone re-reviews FA 43 Limited
Posted By chesebert
Replies: 144
Views: 18,496
Some additional thought on lens sharpness: "Most Lenses are Better Than Most Photographers"

Sharp
Forum: Pentax SLR Lens Discussion 05-02-2012, 11:36 AM  
Lens compression effects on APS-C and full frame
Posted By Giklab
Replies: 56
Views: 12,249
Ahh, now I get what you all have been trying to tell me! Yes, I've mixed up some things /blush/.
Forum: Pentax DSLR Discussion 04-11-2012, 01:25 AM  
Is it possible to have a perfect RAW photo?
Posted By RioRico
Replies: 48
Views: 5,005
A RAW file is not an image; it is a mass of data that MUST be interpreted. It is the equivalent of a latent image on film -- it's nothing until it's developed. Any latent or RAW image can be developed in numerous ways. The data is there; YOU (or the design engineers) get to decide how to work with that data.

I shoot RAW-only almost exclusively with my K20D. Yes, I use various JPG settings, which carry-over as defaults into the RAW developer. Yes, sometimes I shoot images such that I needn't tweak those settings during development. Other times I'll develop numerous versions of an image to work with in PP|editing.

One of my rants: What you think you see, what you want to see, what the camera sees, and what is really there (if anything), are NOT the same. There is no photographic purity, no perfect translation from reality to presentation. Someone decides what data to capture and how captured data is to be processed. Is it you?
Forum: Troubleshooting and Beginner Help 04-29-2012, 09:43 AM  
Non-Pentax K bellows unit - lens won't stop down
Posted By pezmaker
Replies: 7
Views: 1,800
This definitely sounds like the issue, it sounds like the pins aren't being shorted by the bellows, thus the camera doesn't know anything is attached. Emphasis on "sounds like," as in most cases in life, I could very easily be wrong. :D
Forum: Troubleshooting and Beginner Help 04-29-2012, 07:47 AM  
Non-Pentax K bellows unit - lens won't stop down
Posted By newarts
Replies: 7
Views: 1,800
Two solutions come to mind:

1) The problem may be that the camera doesn't know a lens is mounted when the bellows is in place. To see if this is the case, short out all the camera mount electrical contacts with a piece of aluminum foil when mounting the bellows. If the green button now works, make sure the mount pins are touching bare metal when the bellows is mounted by removing finish, etc...

2) Counter-rotate the bellows so the lever is no longer activated then drill a new hole in the mount end of the bellows so the locking pin engages at that rotation. Then when you mount the bellows it'll stop and lock in the new location & allow the use of the lens' aperture ring.

I hope the first solution works. If so, you'll have a valuable bellows!

PS I'd like to see this bellows, unfortunately your link fails.
Forum: Post Your Photos! 04-24-2012, 06:22 AM  
Not Work-Safe Hollywood...1970's
Posted By slackercruster
Replies: 131
Views: 12,617
Sadly, as I go through my negs to scan, I realize I have lost some of my work. Some of these images are scans from old prints or reject proof prints. After 40 years and lots of moves, things get lost. Do better than I did and take care of your work.

These are rough scans, unspotted with some PP for contrast and tone. Taken with Nikon F / Hassy SWC / Ilford and Kodak films / D-76 and Dektol / Kodak Polycontrast and Dupont papers.



..."The camera is an instrument that teaches people to see without a camera." Dorthea Lange
Forum: Mini-Challenges, Games, and Photo Stories 04-20-2012, 03:58 AM  
Thematic Post your most 3-d looking pictures!
Posted By Digitalis
Replies: 365
Views: 43,784
I know this probably isn't the best place to discuss this, but I have spent over 14 years of being a photographer - and having used pretty much every production lens from Rodenstock, Schneider, Leica, Zeiss, Nikon, Pentax, Voigtlander, Canon, Sigma etc- in addition to having spent the past four years as a photographic instructor, I have never seen or made an image that gave me a sense that there was more than two dimensions to it. The fact that many people who post to this thread often state that the images they post have a 3D " feel" about them only highlights the subjectivity of the phenomenon.

To me they all look like ordinary photographs, though some images do have exceptional "pop" - derived from the photographer having used a reasonably fast aperture and the background being just the right distance behind the subject. You get Sigma photographers with their Foveon sensors raving about the same thing and for the life of me: I do not see it, at all.
Forum: Pentax SLR Lens Discussion 04-17-2012, 02:24 PM  
What's your best lens that you never use?
Posted By Lloydy
Replies: 73
Views: 7,198
My DA*50-135 has to be my nomination. There's nothing wrong with it, in fact I rate it as a superb lens. It's certainly a lens I won't part with, I've had such good results from it.
But I went to the dark side and found old manual focus lenses, and they are slow to use, some are just a pain in the butt ( Industar 50-2 :mad: ) to fiddle with. But they slow me down and make me think about what I want from the image, and I like that. I like the challenge of the process of getting a good sharp image from a lens. With the 50-135 I just point and shoot, my hit rate of sharp well exposed images is better, but the hit rate of keepers is way lower. ( But there are occasions when I want what it delivers ;) )
Forum: Weekly Photo Challenges 04-11-2012, 09:15 PM  
Caption Contest April 12-16.
Posted By crewl1
Replies: 28
Views: 2,898
See?! I told you not to use the hairdryer in the bath!
Forum: Weekly Photo Challenges 04-11-2012, 08:05 PM  
Caption Contest April 12-16.
Posted By MSL
Replies: 28
Views: 2,898
John, call the plumber!
Forum: Pentax Q 10-22-2011, 10:56 PM  
Pentax Q Review by PentaxForums.com (w/ micro 4/3 comparison)
Posted By pingflood
Replies: 43
Views: 18,919
I really do not think the camera "literally" yells at you to buy it though that would be a fun feature.
Forum: Pentax K-5 & K-5 II 09-10-2011, 04:28 PM  
Is Otis a Fool?
Posted By Colbyt
Replies: 156
Views: 20,492
Thanks for this post. I now understand you better. In another thread I thought it was me but now I see this is just your style. Not a good one IMO.

Just being honest, I personally consider your post to be really juvenile. Amazing how many of those who can dish it out can't handle any challenge. I am glad that I met many nicer people on my trip to Canada.
Forum: Pentax SLR Lens Discussion 07-11-2011, 12:36 PM  
Disappointed in the 18-135WR
Posted By Immunogirl
Replies: 121
Views: 16,137
Go back and read your posts to me vs. posts other people have made. In addition to your suggestions, there have been several comments like "If you would get this into your head" and a few other things that support the idea that you're berating me. I'm fully willing to accept constructive criticism and fully admitting that setting the camera on P and using picasa isn't the path to great photography, but I don't need the commentary on whether or not I'm thickheaded. And I'm reading everything you're saying and researching it. I'm sure there must be 80 million people that post the same typical problems and questions over and over again, and it must get tiresome for you and people blaming their lens or camera must be a pet peeve. But when you're feeling aggrieved by them, maybe take a break and let someone else do the helping for a while instead of letting it come through in the tone of your reponses.



If I was absolutely convinced that this was the lens and absolutely blaming the lens, it'd have been sent back to amazon on Thursday, the day after I took the pics and I wouldn't have posted this thread. Which is why I'm not entirely sure why I keep being accused of refusing to consider that it's not the lens that is bad or assuming that it is. Because really, while it's cheaper for me to return the lens, the WR features of the lens would make it a lot easier and I'd be far less worried about taking my camera out on the water... Now I have judgement calls about is this shot actually worth having to buy a new camera body if I flip or drop the camera? Now, quite possibly if I flip the kayak with a WR lens, it'd still ruin the camera, but I'm gonna pretend it's less of a risk. I have it tethered to my pfd when it's out, so it's just gotta be okay the 10 seconds or however long it takes me to roll back up.






When you go out on a photo shoot, how do you select which lenses you take? Do you grab such and such lens, because in the past, it's done better with low light? Or some other lens, because it does a nice job at bright lights? I'm assuming alot of your decisions on which lens you're using is what has worked well in the past and not necessarily a direct comparison of all the lenses. Use lenses for a while and you get an idea of when they shine, when they struggle, when whatever. So instead of assuming that I have absolutely no idea about any of my lenses & their performance in various conditions, how about assuming that I have used my camera before?

I can of course continue to show you 80 million pics that I've taken in a kayak and hope that eventually one of them will convince you that I actually have taken photos from a kayak before fairly regularly with various lenses in all different sets of conditions and that I might have some sense of what my lenses can do. Or if you're really bored, you can root through my picasaweb - I'd probably advise you not to bother, 'cause most of the time it bores me looking through it.

I posted cave pics, because you asked if I've ever used the other lenses in a kayak, as an example of low light, movement in the boat, and being able to get pics that had enough detail, freezing motion, etc... If with the rest of my lenses, I can shoot in far worse conditions than what I was out in the other day and get acceptable results, a lens that I can't get a good pic on a bright sunny day to me is suspect. And yes, there are probably some settings that I could change on the camera to force it to take a better picture... And when I walk around with my camera, I look at the image playback, check the highlights/shadows, histograms, etc., and I adjust my exposure for that to improve it and I put it on manual focus, and blah blah blah. And when I'm in a kayak, I don't, because I usually don't have that luxury. I shoot on P. I'm fully willing to accept that, okay, for this lens, it's happier on -2 on Tav mode instead of P at 0. But it's just gonna sit at that setting instead of me constantly changing it. So I'll look into the setting changes on P mode that Skog suggested.

You guys also have to realize that I took 600+ photos with that lens that day. Most of them were far worse than what I posted on here. What I posted on here, I took out of the reasonably good pics. So when you tell me that they aren't that bad, I'm still considering all the other far worse ones that I took. So when I
say that I consider the pics horrible, I'm taking in account that there's another 400-500 pics that are horrible.

I didn't have time to post all the exif data yet, but looking back at the pics the 18-135 wr took that day, it was usually ISO 200, sometimes Iso 400. When looking at all the pics of moving birds, aperature varied between f5.6, 10, & 18. Exposure times were between 1/200 secs & 1/1500 of a sec for moving birds, most around 1/500.

Looking at the 80-320 bright sunny day pics of people in kayaks, I posted here, iso was 200-400, usually aperature around 5.6, and exposure times were between 1/200 and 1/2000 of a second. I went back to some pics I took with that lens out on the water on an overcast misty morning and exposure times were about 1/320 with motion stopped and an in focus image. The 80-320 is far longer than the 18-135 and probably similar in weight (i can weigh them later), so I don't think weight of the lens is that much of an issue - but maybe I had too much caffeine that morning and had shaky hands.

Right now, I think the easiest/laziest way for me to test the camera out on the water is to go through the diff modes that Skog/Clinton/and everyone else suggested, and tell the camera to auto bracket and see whether I like some of those shots, and then get more meticulous to dial it in. I can switch back and forth between a couple lenses on the water, but want to limit that to a certain extent. if after all that, I'm still not convinced of the lens - I can try the tripod thing. Or I can just exchange it and see if I'm happier with another copy of it.
Forum: Pentax Q 06-23-2011, 07:01 PM  
Pentax Q in the Flesh
Posted By junyo
Replies: 1,310
Views: 223,684
Please get over yourself. The criticisms have nothing to do with wanting Pentax or the camera to fail, and everything to do with the reasonable fear that it will, and thus damage their access to products they enjoy. Uncritical fanboy-ism and pretending not to have doubts doesn't make the camera any more or less viable than stating an honest impression. People are mostly stating rational objective concerns, and if you can't voice an opinion without being accused of malice, then maybe this should be changed from a forum to a marketing newsletter.
Forum: Pentax DSLR Discussion 01-21-2011, 12:18 PM  
Give up SR and get a thinner camera?
Posted By Ron Kruger
Replies: 25
Views: 4,682
That's ironic. I find my wife to big when I'm walking with my K20D.
Forum: Pentax SLR Lens Discussion 12-21-2010, 01:17 AM  
DA Limiteds vs. FA Limiteds
Posted By simico
Replies: 120
Views: 22,055
Simply put: people buy FA Limiteds to boost their e-*****, DA Limiteds to actually take photos :lol:
/joke

Kidding aside, there are some people who buy FA Limiteds only to show off and for bragging rights, and they take every opportunity to tell they have these lenses. Of course you never see any pictures from these people, the lenses are just a status symbol to boost their ego.

I don't care about FA or DA Limited label in general. I always check the individual lens and don't care about the label on it. If it does what I need and does it good then I buy it regardless of what label (or brand name) is on the lens & box. If it doesn't do what I need or doesn't do it good enough for me than I don't buy it and don't care about that lens anymore even if it's the praised FA31 Limited.
Forum: Photographic Technique 12-28-2010, 01:33 PM  
RAW - Is it just me, or did I mis something along the way?
Posted By RioRico
Replies: 140
Views: 18,058
Actually, I don't watch TV, haven't for over a decade. And it was crap many decades ago, even before I got my FCC 2nd and 1st tickets in 1971. And I must apologize for 'delusional' -- I should have said 'misinformed'. But this is true: What we think we see, what we want to see, what a camera sees, and what is actually there (if anything), are not the same. So we use various tools to accommodate those varied visions.

My point is that we adopt new tools because they deliver. There's nothing wrong to refuse to use such tools -- just realize that tool-users will be more productive and will eventually devour non-tool-users. Digital devoured film; film devoured plates; plates devoured daguerreotypes. The older tools now exist in shrinking niches. Recreating those older vistas can be fun, which is why I like shooting with blue-violet filters to replicate the 'actinic' (UV-violet-blue) light that early photo-emulsions saw. But the demand for actinic-light photography is small. Ratz.

ObTopic: RAW is the equivalent of an unprocessed negative, a latent image residing in sensor data. Neither RAW files nor latent images are finished products. We shoot RAW 'cause it gives us many ways to generate finished pictures. I've processed some shots in dozens of ways, with various filter-contrast-saturation-density-speed-etc variations, with none being more or less 'real' than any others.

The image is a map; the map is not the territory. RAW lets us use different maps to view the territory in various ways, starting with a larger set of data than will be contained in any single map. Much data is discarded to make a JPEG image, just as much geospatial data is thrown out in mapmaking. We can let the camera's wee little brain and its pre-packaged algorithms decide which data to throw away, or we can decide for ourselves. Sometimes I can outsmart the camera's wee little brain. If I'm lucky...

So RAW is all about control. Who controls the image, me or the factory?
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