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02-24-2012, 08:43 AM   #1
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Pentax Q + 200mm f/5.6 Tele-Takumar

Just a nice excercise. The 200mm Tele-Takumar is not APO and of course f/5.6 is well beyond the diffraction limit of the Q. But it's nice to see what's possible with very old glass.
I used the Q on a very sturdy tripod, a C mount to Q adapter and on that a M42 to C mount adapter.

Don't forget that this is 1120mm equivalent compared to FF, or 750mm on APS-C.

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02-24-2012, 11:56 AM   #2
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An interesting exercise, thanks. I would like to see the results with a faster lens, like the 300/4 or the 200/2.5. I remember seeing someone post some pretty decent shots with the 100/2.8 WR Macro.
02-24-2012, 12:10 PM   #3
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QuoteOriginally posted by Asahiflex Quote
............ and of course f/5.6 is well beyond the diffraction limit of the Q. But it's nice to see what's possible with very old glass.
Please educate me here. What does it mean that f5.6 is beyond the diffraction limit of the Q? Is the limit something to calculate from the sensor size?
thank you.
02-24-2012, 12:24 PM   #4
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Good little article from RiceHigh on the subject for you, but which I don't quite agree with.

RiceHigh's Pentax Blog: When the Diffraction Limit is Reached..

After reading that, have a look at this link which explains diffraction in respect particularly to digital camera sensors. The diffraction can actually be larger than a single pixel pitch without too much effect due to the nature of camera sensors.

Diffraction Limited Photography: Pixel Size, Aperture and Airy Disks

This part in particular is of interest

QuoteQuote:
Recall that a digital sensor utilizing a bayer array only captures one primary color at each pixel location, and then interpolates these colors to produce the final full color image. As a result of the sensor's anti-aliasing filter (and the Rayleigh criterion above), the airy disk can have a diameter of about 2-3 pixels before diffraction limits resolution (assuming an otherwise perfect lens, when viewed at 100% on-screen). However, diffraction will likely have a visual impact prior to reaching this diameter.


02-24-2012, 12:38 PM   #5
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The second sentence in RH blog cleared it up. Thanks for the reference.
02-24-2012, 01:17 PM   #6
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QuoteOriginally posted by kenafein Quote
An interesting exercise, thanks. I would like to see the results with a faster lens, like the 300/4 or the 200/2.5. I remember seeing someone post some pretty decent shots with the 100/2.8 WR Macro.
Thanks for your comments! Unfortunately I have only a M42 to C-mount adapter right now, I'm still not sure which PK to Q adapter is the best for me. Especially after seeing the nice original Pentax PK to Q adapter with built-in shutter and tripod mount.
02-24-2012, 01:20 PM   #7
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Peter, how about showing us what does that combo look like?
02-24-2012, 02:18 PM   #8
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QuoteOriginally posted by Raffwal Quote
Peter, how about showing us what does that combo look like?
Sure! As you can see the whole set-up is actually quite small and light. It would be the bird photographer's wet dream if it delivered FF results

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02-24-2012, 02:33 PM   #9
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Thanks. That looks ... interesting. Did you shoot hand held?
That's actually approaching the NEX system where one inserts a "digital back" to an optical lens.
02-24-2012, 02:38 PM   #10
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I wouldn't dare to use that combo hand-held. Not without an optical finder and not with those low shutter speeds thanks to the bad weather. The first photo was taken at 1/4s.

The Q is definitely growing on me...
02-24-2012, 04:06 PM   #11
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I thought all those 3rd party PK/Q adapters had a tripod holder but i'm also waiting on Pentax's OEM but the longest lens i'm planning to use is a 50 for shooting sports on the sidelines.
02-24-2012, 05:14 PM   #12
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Same here... I got my Pentax M 50 1.4 I cant wait to use on my Q, just waiting for the official adapter to come out. I plan on using it for nature and traveling...
02-25-2012, 12:44 PM   #13
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A little moon through the clouds:

02-26-2012, 07:26 PM   #14
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QuoteOriginally posted by Asahiflex Quote
I wouldn't dare to use that combo hand-held. Not without an optical finder and not with those low shutter speeds thanks to the bad weather. The first photo was taken at 1/4s.
Some nice examples of what we can get with some of the very compact screw mount teles. The 135 f3.5 Super Takumar and 200 f4 S-M-C Takumar were some of the first lenses I tried since they're so compact, even though they're pretty dense.

Handholding, considering that I don't have the advantage of SR, is not as bad as I had thought it would be. I've shot my S-M-C Tak 200 f4 with the Q handheld, but you do need reasonably good light to keep shutter speeds up to faster than 1/125.

https://www.pentaxforums.com/forums/pentax-q-forum/164530-some-q-shots-k-m42-lenses.html

The last 3 bird shots are with the 200/4. I probably could do a little better now that I have a bit more experience with the focusing. . .

Also, I've had one opportunity to shoot the Q with the D FA 100 Macro in the field, totally unsupported handheld from between @ 60-30 ft when I saw a Red Tailed Hawk grab a squirrel and carry it off to an area just off the road. These are only two of about 30 shots I was able to get from different distances as I carefully stalked closer. I was wishing that I had my K-5 and FA* 300/4.5 at the time, but am certainly glad I had the Q with the 100/2.8 with me. With the f2.8 max aperture, and at 360mm EQ to APS-C, I had just enough light to get 1/100 at 160 ISO and enough reach to get these shots.





I think that if they release the K to Q adapter with the tripod foot as pictured, and if it has a shutter in the adapter, (and, of course, the aperture control ring as shown) then it will be easily the best adapter of this kind. I'm a bit afraid to see the price though, but if it has the shutter, then I'll have to get one so I can use flash practically with adapted lenses. The 1/13 flash sync is just too slow to work around with any level of ambient light.

Scott
03-03-2012, 11:12 PM   #15
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QuoteOriginally posted by imtheguy Quote
The second sentence in RH blog cleared it up. Thanks for the reference.
You can also see the effect of diffraction in the photozone reviews. There's a fall past f/4.
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