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Forum: Pentax SLR Lens Discussion 10-09-2015, 09:30 PM  
FREE Pentax M50 f2
Posted By jwc77
Replies: 27
Views: 3,433
About a month back or so Dlanor Sekao gave away a free lens on here. I like his style and so I will follow suit. I have an M50 f2 in great shape collecting dust (too many 50s...not enough time to use them all).

Like Dlanor I'd like it to go to someone who needs it and will use it and not someone with too many lenses already that it sits like it does in my collection. Tell me why you need it and I'll decide in the next couple days who gets it...I will ship it free of charge to you on Monday.

And who knows...I may throw in additional swag like Dlanor did when I go through my equipment to box it up and ship it out!
Forum: General Talk 09-10-2015, 05:33 PM  
Solve the problems surrounding the creation of a moon outpost.
Posted By DAZ
Replies: 13
Views: 1,426
Building a permanently manned outpost on the moon is not only an intriguing problem but quite possibly an imperative one for us. Just like many of the problems of Europe before the discovery of the Americas the answers were not discovered in Europe but in the Americas. Just as likely many of the solutions for today’s problems cannot be found here but only when we go someplace else. The solutions may be from someplace else or simply from the ability to look back and see the problems from a different perspective.

You really must decide why you are going there. Why determines what you will be doing and this will determine the how.

2 examples of this are if you’re going to mine HE3 or are you going to use it as a staging post to go further out into the solar system.

If you’re going to mine HE3 to help solve the world’s power problems you will probably want your outpost to be someplace along the lunar equator on one of its vast open dusty plains. This means you will have relatively 2 weeks of intense sunlight followed by approximately 2 weeks of near total darkness. At times the sun will be directly above your habitat. You will have to worry more about shielding from solar storms. There are basically 2 ways to do this the 1st would be to bury your habitat using the available materials. The 2nd would be to use some kind of magnetic shielding which would most likely require a great deal of power. Fortunately for the 2nd one at the time you would need the most power is also when you’d have the most direct sunlight.

For the other example, having a staging post to go further out into the solar system you would most likely be looking for a different material. The most useful material would be large quantities of water. The most likely source of this material would be at the lunar poles. Vast quantities of water have been located at these locations. This water could be turned into rocket fuel or just water to live off of. The advantage of being at the polls is that your shielding becomes much simpler. There are locations that are in perpetual darkness. These happen to be also the same places where the vast quantities of water are located. So very little additional shielding would be needed from the sun. As to where you get your power from you could use a nuclear power source or on some of the high mountain tops they are also in perpetual sunlight. You could build your solar collection station on one of these mountaintops.

For either solution your 1st habitats would probably be the Bigelow inflatable habitats. One of these habitats has been in orbit around Earth for years and shows no sign of any adverse leakage. A small test article for human habitation is scheduled to be launched soon to the international space station for multiyear tests.

The actual problems of long-term habitation on the moon are actually some of the simplest problems to be overcome. They are essentially engineering with multiple possible solutions primarily depending on your price points and time frames.

The real problems is getting the stuff up to the moon. Because of the nature of the rocket equation the farther up the gravity well you go there is an almost logarithmically increase in the costs and difficulties. This is why rockets have payloads are only 5 to 1% of their starting weights. To have a realistic chance of doing anything on the moon you must drastically bring down the costs of getting things into space. The costs of getting into orbit have been said to be about 70% of the costs of going anyplace in the solar system including the moon.

For decades many people have talked about reducing the costs of getting payloads into space. But like the weather it is something that is talked about quite a bit but very few have done anything about it. The closest and to date most successful of having any kind of radical reduction in cost has been the company SpaceX. They have already reduce the costs by approximately a factor of 2 and are looking to reduce those costs still further to approximately 10 times less. Using SpaceX present rock and the Falcon 9 it is just not reasonable to send a payload to the moon. Using their soon to be produced Falcon 9R heavy it would be possible to send payloads to the moon. Even with the reusable version of this rocket the payloads are still too small and the costs are still too great for any kind of realistic long-term manned lunar habitat.

SpaceX is looking further into the future than just their falcon 9 system. They wish to produce a much bigger rocket than even the mighty Saturn 5 for now only referred to as the BFR. B stands for big and are stands for rocket you can fill in the F for yourself. SpaceX’s intention for this BFR is to use it as part of their system for long-term colonization of Mars. There is no reason why this BFR can’t be used to put an outpost on the moon. In fact there are many reasons why the BFR would be even more suitable for this than the long-term colonization of Mars.

Once you have these large payloads in Earth orbit your next problem becomes how to get them to lunar orbit. For this you must break down your payloads into 2 distinct types. People would be one type of payload and all cargo that is not time sensitive would be the 2nd type. The 2nd type you could make solar electric tugs which could take months to get your payloads to the moon and back but would be very efficient. To get people you’d probably want to do this much faster and greatly reduce their radiation exposure so these would be smaller but faster chemical rocket systems.

So to recap you’ll need to start literally on earth with a rocket system to get into orbit. Than what you put on the moon will depend on what you intend to do their which in turn will determine what it looks like.
DAZ
Forum: General Talk 08-01-2015, 05:28 PM  
A discussion on what would be needed for interstellar travel.
Posted By DAZ
Replies: 156
Views: 10,381
I do believe I use the words “extremely expensive”. Everything that I was talking about either used existing technologies like the Orion spacecraft or predictable advances in existing technology. Even so none of the 3 proposals are guaranteed to succeed.

The part of the 3 proposals that seems the most difficult, the nuclear pulse detonation engine, is actually the easiest and is based on 1950s technology. This technology has been vetted by some of the best scientific and engineering minds on the planet. Not only could they find no significant flaws many advocate us actually building it today.

The proposal for the Orion spacecraft was actually on the president of the United States desk. He rejected it not for cost or technical but for political reasons. One “small” Orion spacecraft could lift in a single launch more weight than all of the previous launches into orbit that human race has done combined. We are talking a large battleship or aircraft carrier in one piece in one launch. Many of the details of the Orion project are still classified but a lot of it has been declassified and is available on the web.

From a technological point of view the building of the 3 ships that I mentioned is the simplest part of the problem. It would probably be impossible to produce the political will to build any of the ships unless the extinction of the human race was shortly eminent.

What we refer to as the human race has continued to change over its existence. If we were to look at our ancestors from 50,000 years ago we would have a difficult time recognizing them as human. If our ancestors from 50,000 years ago were to look at us they most likely would not recognize us as human.

Our intelligence gives us the ability to create and manipulate technology. This is accelerating the process of our change. It also allows us to go into environments that evolution has not equipped us to survive in. An example is we can go from the deepest oceans to the vacuum of space. No other creature on this planet can do that on its own.

Interesting enough intelligence has not yet be demonstrated to have an evolutionary survival advantage. If we survive 10,000 years the humans of that time may not recognize us as humans and we most likely would probably not recognize them as humans.

To survive another 10,000 years (or the next 100 years) the human race will most assuredly need to leave the cradle. It most likely won’t be to the stars (at least without some unforeseen advancements in science and technology) but there is definitely plenty we can and should do in the inner solar system.

If we do go to the stars to “save the human race” it will most likely will be the beginning of the end of the human race. It will force changes on us faster and more profoundly than any other changes that have happened to us in the past. This will be the end of the human race as we know it in and the beginning of something else. What that something else would be is impossible to say but it will replace the human race as we know it.

DAZ
Forum: General Photography 04-23-2015, 12:33 AM  
Technical quality vs just liking the overall appearance of a shot...?
Posted By manntax
Replies: 32
Views: 4,175
For me it is all about the moment. No matter how perfect the technical side of photo is - if it doesn't capture an unique moment - it is just another shot.. Yet I have seen and shot many somehow imperfect photos that are actually best from the whole bunch. And the reason was simple : an unique moment captured that makes the subject's appearance having special meaning, carrying much more than just the physical likeness of it.
Forum: Pentax SLR Lens Discussion 03-31-2015, 06:19 PM  
FREE ! Ricoh Rikenon XR 50mm 2.0 to someone that "NEEDS" it
Posted By Dlanor Sekao
Replies: 12
Views: 1,764
Ive been very blessed on the Pentax Forum since I joined about 18 months ago and would like to give back a bit to someone.
Have learned a huge amount about cameras , lenses , new products , and technical issues and challenges.....Thank YOU Pentaxian's !


I have a Ricoh Rikenon XR 50mm 2.0 "L" lens that I simply don't need. The glass is perfect , works perfect , and produces nice images. Its very very clean and nice looking....Its got a bit of paint flaking off the scale but that is common with this model and affects nothing. Front and rear caps are included.
It Does not have the dreaded Ricoh pin and also has no "A" setting.....strictly manual.

Ricoh XR Rikenon 50mm f/2.0 Lens Reviews - Ricoh Lenses - Pentax Lens Review Database



Would like to give this away for free ! Not just as an addition to someone's "Collection" , or as an addition to someone's "Bucket of Primes" that has LBA.....But to someone who actually "needs" it and will appreciate it and use it ! Maybe a student , aspiring amateur , or maybe to someone who simply cant afford to buy one on their own at the moment ?
That's who I want to get it......all you have to do is ask.......Its yours for FREE..... and shipping is on me.....FREE !


I will make the decision who gets it as I want it to go to someone who NEEDS it....so ask away. It will be shipped Friday about noon and I will PM and post here.


Thanks everyone.....
:)


Here are a couple real quick PS pics of the lens.....The last picture (Soda Can and Samyang 14mm) was taken with this lens @ f4
Forum: Mini-Challenges, Games, and Photo Stories 11-26-2014, 09:19 AM  
Thematic Useful re-purposed items you use with your camera kit.
Posted By BrianR
Replies: 38
Views: 5,974
I found a small lunch cooler with no lid discarded in the woods that I've re-purposed as a portable mini-studio. Just add light and it provides fill from all directions. It features a waterproof, easy to sterilize surface, and a convenient carrying handle. Here it is almost in use, a picture of a frog being held where the live subject normally sits:


Portable Frog Studio by Jelly Brain, on Flickr

And the result:


Blue Headed Green Frog by Jelly Brain, on Flickr

and another:

Young Snapping Turtle by Jelly Brain, on Flickr
Forum: Post Your Photos! 11-07-2014, 09:52 AM  
Black & White Crumbling Mansion in Petrolia, Ontario
Posted By rfaucher
Replies: 14
Views: 1,575
Back in September my brother and I grabbed our Pentax gear to do wander streets of Petrolia, Ontario. We came across the grand old Victorian Mansion that looks like it has seen better days. I know nothing of the history about this place, but it captivated me. I felt drawn by its majesty, the sense of a fading glory and former elegance and a sadness to see it in decay, but a glimmer of hope as it is being slowly restored.

I took the photo with my K-3 and the 21mm Ltd lens, which make for a great walk around system. I always shoot DNG and this photo was first developed in Lightroom and then converted to B&W in Silver Efex Pro 2.
Forum: Post Your Photos! 11-02-2014, 05:04 AM  
Landscape Which is your pick?
Posted By kengoh
Replies: 23
Views: 2,032
Sharing some shots of Shanghai Skyline featuring the Oriental Pearl Tower.

#1 Sunrise @6:22am

Another Shanghai Skyline sunrise by kengoh8888, on Flickr

#2 Morning @6:52am

Shanghai Skyline sunrise by kengoh8888, on Flickr

#3 afternoon

Oriental Pearl Tower by kengoh8888, on Flickr

#4 sunset

Shanghai Skyline sunset by kengoh8888, on Flickr

#5 and finally waited for the building lights to turn on

Shanghai Skyline @Blue Hour by kengoh8888, on Flickr

Which is your pick? :)
Forum: Post Your Photos! 11-01-2014, 09:58 AM  
Landscape Sunset on the Black Sea
Posted By Hattifnatt
Replies: 15
Views: 2,031
A nice sunset that I've seen on my way to some oil rig from the Black Sea. Sorry if the pictures feel kinda repetitive, but I wanted to capture the Sun all the way down. Some photos were X-posted on the DA Zoom Club.

Sunset on the Black Sea by Hattifnattar, on Flickr

Sunset on the Black Sea by Hattifnattar, on Flickr

Sunset over Black Sea by Hattifnattar, on Flickr

Sunset over Black Sea by Hattifnattar, on Flickr

Into the Light by Hattifnattar, on Flickr

Sunset over Black Sea by Hattifnattar, on Flickr

Black Sea Sunset by Hattifnattar, on Flickr

The Moon comes out at some point:

Sun and Moon by Hattifnattar, on Flickr

Black Sea Sunset by Hattifnattar, on Flickr

Going Down by Hattifnattar, on Flickr

Sunset on the Black Sea by Hattifnattar, on Flickr

... and it's finally over.

Sunset End by Hattifnattar, on Flickr
Forum: Post Your Photos! 10-30-2014, 02:46 PM  
Night Tarntula Nebula and the Large Magellanic Cloud
Posted By hjw
Replies: 10
Views: 1,229
In one of my previous posts a forum user, Bossa, pointed out that a bright region in the Large Magellanic Cloud is actually the Tarantula Nebula. Having my curiosity triggered, I spend the last two nights collecting 90 frames with 10sec exposure each. ISO varied between 3200 and 12800. I also took 20 dark frames the various ISOs. The first picture is the full frame resampled to 50%, the second is the nebula at a 100% crop. All I need now is a telescope and a proper mount :rolleyes:.
Forum: Post Your Photos! 11-02-2014, 07:41 AM  
Night Charles Bridge
Posted By Hattifnatt
Replies: 10
Views: 1,217
Some night shots of the Charles Bridge in Prague (x-posted on the mind control club)

Charles Bridge in Prague by Hattifnattar, on Flickr

Charles Bridge in Prague by Hattifnattar, on Flickr

Charles Bridge by Hattifnattar, on Flickr

Charles Bridge, Prague by Hattifnattar, on Flickr
Forum: Post Your Photos! 11-01-2014, 02:04 PM  
Landscape Closure
Posted By gildedfool
Replies: 12
Views: 1,205
Captured this week while visiting with family. Our favorite beach.
Forum: Post Your Photos! 11-02-2014, 07:52 PM  
Landscape Break Through
Posted By Bob Harris
Replies: 7
Views: 666
here comes the sun......
Forum: Post Your Photos! 11-02-2014, 10:07 AM  
Not Work-Safe Blue
Posted By redcat
Replies: 11
Views: 439
Forum: Lens Clubs 11-02-2014, 05:19 AM  
The Sigma Lens Club- All lenses
Posted By Digitalis
Replies: 3,224
Views: 497,583
Another image of the lightning storms:


Pentax K5IIs - Sigma 8-16mm f/4.5-5.6 EX DC @ 12mm f/11 ISO 80 30"
Forum: Mini-Challenges, Games, and Photo Stories 01-04-2011, 02:10 AM  
Thematic Post your Favourite Sunrises
Posted By sam1989
Replies: 801
Views: 68,320
Some fantastic colours.

Here's Bromo National Park in Java

Forum: Post Your Photos! 10-31-2014, 05:54 PM  
People AHS: Josephine
Posted By DonThomaso
Replies: 5
Views: 1,036
Second pic in my American Horror Story-inspired series, timely for Halloween as well! This time Josephine Caspari is both model and makeup artist. Photography and a bit of editing done by myself :)

Pentax K-3, SMC Pentax-FA 77mm F1.9 Limited. 1/180 sec at f/4.5, ISO 100


Pentax K-3, SMC Pentax-FA 77mm F1.9 Limited. 1/180 sec at f/4.5, ISO 100


More images in the AHS-series is available on my flickr

My page on facebook.
Forum: Post Your Photos! 10-31-2014, 01:21 PM  
Landscape Misty moring sunrise on the river
Posted By Korg
Replies: 10
Views: 1,551
Taken yesterday morning, thanks for looking.
Forum: Post Your Photos! 10-30-2014, 10:19 AM  
Landscape My first long exposure with P 645Z
Posted By Vitelle
Replies: 23
Views: 5,412
Hello everyone, I'm new to the forum. I finally had a chance to take my Pentax 645Z out last week. It was hard to shoot outside because we've been having so much rain everyday here. This image is from a single shot, taken with Lee Big Stopper and B+W polarizer and pretty much simple adjustment (adjusted shadow and white balance, reduced saturation and increased vibrancy).
Forum: Post Your Photos! 09-29-2014, 02:34 PM  
People ramo
Posted By florinlib
Replies: 8
Views: 1,378


Another one from the same shoot:



Forum: Post Your Photos! 09-28-2014, 10:36 AM  
Night First attempt at astrophotography w/K50
Posted By Bob Harris
Replies: 9
Views: 2,560
very nice efforts for sure here, I especially like in some how you've included trees or shrubs. yes about the stacking from "hjw", will be interested to see your continued success.
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