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Archive 2010 · Moon By Lens (100% crops)
  
 
sirimiri
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p.11 #1 · Moon By Lens (100% crops)


Bifurcator wrote:
BTW, is this the lens you used?
http://img265.imageshack.us/img265/6950/pentax645n12140710mbpr4.jpg
What a cool looking lens! Looks like it's sharp for birding too:

That's the lens. The carrying handle is a cool idea but adds lots of weight and frankly, bulks it up when you place it in a backpack.

In that image above, the 128mm (!) OEM protective Pentax filter is missing. The manual states: "...the filter is designed for part of the optical system, it is advisable to keep it on all the time."

Another great feature is the rotating portion of the lens tube. You don't rotate the barrel through the collar, you only twist the rear tube/camera through 360 degrees.



Feb 19, 2011 at 10:32 PM
Bifurcator
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p.11 #2 · Moon By Lens (100% crops)


Yeah, several lenses I have have a rear filter and all of them say that "it's part of the optical formula" but in my tests it does nothing other than add internal reflections. In both the FD 300/2.8L and the FD 300/4L for example I can see it plainly. If I set my camera to spot metering and then point it just off the edge of the full Moon the EVF amplifies the image (tryig to compensate for the blackness of space) and the internal reflections of the Moon surface show up very brightly. Slide out the rear filter and the reflection disappears leaving only clean black space and a white Moon. And all my resolution tests show that there's no detectable difference with or without it. Maybe it would matter for AF or something?

So IMO if you're shooting bright or high-contrast objects you're better off without it and otherwise it just doesn't matter either way.




Feb 19, 2011 at 10:58 PM
sirimiri
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p.11 #3 · Moon By Lens (100% crops)


Perhaps it's a soft element behind it? Soft, as in coating or glass type or otherwise? I don't know, I don't have a block diagram that says anything.

"merely conjecture"



Feb 19, 2011 at 11:05 PM
Bifurcator
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p.11 #4 · Moon By Lens (100% crops)


There's some more discussion about this with Ed Sawyer (who I do trust to know what he's talking about) starting here: http://www.fredmiranda.com/forum/topic/954103/1#9209081 although concerning a 18mm UWA lens.




Feb 19, 2011 at 11:09 PM
Bifurcator
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p.11 #5 · Moon By Lens (100% crops)



The Moon:


400mm, f/5.6, 1/20s, ISO 100


The Lens:


Tamron 200-400mm AF, IF, LD, f/5.6


That's through clouds in the day-time BTW... I'm waiting for a clear night to get a good shot with this tamron. I'm thinking it'll be pretty great cuz the lens is actually quite sharp for terrestrial imaging.



Jul 05, 2011 at 04:44 AM
 

Search in Used Dept. 



Bifurcator
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p.11 #6 · Moon By Lens (100% crops)


Here's a little better shot with this lens. It was still still hazy and the sky was dawn-ish but both less so than the previous image. With crystal skys this lens should be even better than this...

The Moon:


400mm, f/5.6, 1/20s, ISO 100


The Lens (again):


Tamron 200-400mm AF, IF, LD, f/5.6



Man, atmospheric conditions sure make a massive difference... :P





Jul 05, 2011 at 11:02 PM
tc95
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p.11 #7 · Moon By Lens (100% crops)


OK...here are my shots...

SD14 + Nikkor 800 5.6...





SD-14 + Nikkor 800 5.6 + Tamron 1.4 TC


The Set-up...





Great stuff everyone...!!!



Jul 06, 2011 at 04:39 AM
Dustin Gent
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p.11 #8 · Moon By Lens (100% crops)


Rokonion 85mm from the 4th.







Jul 07, 2011 at 03:47 AM
mpmendenhall
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p.11 #9 · Moon By Lens (100% crops)


Leica APO-Telyt 280/4 + Canon 2x II + Canon 1.4x II = 780mm/f11 (5D, 100% crop)





And, comparison between Canon 1.4x II and Leica APO-Extender-R 1.4x
100% crop, upper right corner, Canon 1.4x II first:





Leica APO 1.4x, upper right corner:





not perfectly APO in the far corners, but a lot sharper/more detailed than the Canon (the slight CA cleans up very easily with adjustment), and slightly more magnification



Jul 16, 2011 at 05:34 AM
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