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06-22-2016, 04:12 PM   #31
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QuoteOriginally posted by stevebrot Quote
I don't have a K-1, but I do have a long history of using the genuine Pentax M42 adapter on both APS-C digital and K-mount film bodies. With practice, adapter removal should become easier and should take no more than a second or so. As for mounting, I strongly suggest putting the adapter on the lens first and mounting the assembly to the body as a regular K-mount lens. When doing a lot of lens changes, using two adapters this way will allow lens change times with mirror box exposed only marginally longer than with a regular K-mount.


Steve
I used to own a K3ii and a K5. Indeed, using a M42 adapter on the K1 is exactly the same as it was on these two APS-C cameras.

I certainly agree that the preferred M42 mounting method is as you describe (put adapter on lens and THEN put the lens on the camera). I didn't do that during today's testing because I had 7 M42 lenses to test and only one genuine Pentax M42 adapter.


Last edited by Fenwoodian; 06-22-2016 at 04:41 PM.
06-22-2016, 07:54 PM - 1 Like   #32
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Well, I'm studying the images from today's test shoot. I photographed a landscape, focusing on a specific subject about 30 yards away.

For each of my 13 50mm lenses, I took 6 photos - wide open, two stops closed from wide open, 5.6, 8, 11 and two stops from fully closed. A total of about 90 photos - or 90 RAW/DNGs and 90 JPGs.

Tomorrow, I'm going to be testing these 13 lenses again, but this time I will be photographing a subject that's about 10 feet from the camera. I'll shoot each lens from wide open to 2.8. I'm intending to see if I can determine which of these lenses offers the best "3D Subject Rendering". I'll post my conclusions in a few days after reviewing the JPGs from tomorrows test if there's enough interest from you in seeing my conclusions.

I will be keeping all of the image files from all of these tests. By the time I'm done with doing the distance test, 3D rendering test, and bokeh test on just my 13 lenses I'll have over 400 image files. At this point, I don't know if (or how) I can best share image files with you all. I can't do it here on the forum. The largest image file size that I can post to my Flickr page is severely restricted in size, and I do have a Drop Box account but I really don't care to post hundreds of images there. If any of you have a recommendation on how and where and what image files I might post from these tests that is practical and not all that time consuming please let me know.

Maybe tomorrow I'll finish my review and my initial test results and post my rankings of my 13 50mm lenses based upon today's distance tests. Stay tuned...

Last edited by Fenwoodian; 06-22-2016 at 09:02 PM.
06-22-2016, 11:21 PM - 1 Like   #33
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Below are my "sharpness" ratings from 1 to 10 (10 is perfection on a non-pixel shift shot). Ratings are based on the sharpness of each lens at its' optimum aperture.

Click here to see a photo of each lens.

13. MC Zenitar - M2s 50/2 = 4
12. Steinheil Munchen Cassar S 50/2.8 = 6.5
11. Auto Chinon MC 50/1.7 = 8
10. KMZ Zenitar-M 50/1.7 = 8
9. Auto Mamiya Sekor 55/1.4 = 8.5
8. Carl Zeiss Jena DDR Pancolar 50/1.8 = 8.5
7. SMC Pentax-A 50/1.4 = 8.5
6. SMC Pentax-D FA 50/2.8 Macro = 8.5
5. Revuenon 55/1.2 = 8.5 overall & 9.0 center
4. Cosina MC 55/1.2 = 8.5 overall & 9.0 center
3. Voigtlander Color-Ultron 50/1.8 = 9
2. Carl Zeiss Planar 50/1.4 ZK = 9
1. Helios 44-2 58/2 = 9.0 overall & 9.5 center

Pixel Shift using SMC Pentax-D/2.8 Macro = 15-20 ("off-the-charts" sharpness, makes the best lenses I tested in the "non-pixel shift mode" look like they were out of focus!)

As we all know, sharpness is only one characteristic of a photo. There are many other characteristics (e.g. bokeh, color, contrast, vignetting, accurate f stops, subject isolation, ergonomics, etc) that must be considered when giving an "overall" rating to a lens. Anyone want to see my "overall" rating on the above lenses when used on a Pentax K1 camera?

Last edited by Fenwoodian; 06-23-2016 at 12:05 AM.
06-23-2016, 01:53 AM   #34
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This is just great. I'm really looking forward to your detailed results. Thanks so much for your efforts!

However, I don't understand what you mean when you say,
QuoteOriginally posted by Fenwoodian Quote
The largest image file size that I can post to my Flickr page is severely restricted in size
I see people posting full size images all the time on Flickr. Where's the problem?

06-23-2016, 04:15 AM   #35
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QuoteOriginally posted by wkraus Quote
This is just great. I'm really looking forward to your detailed results. Thanks so much for your efforts!

However, I don't understand what you mean when you say,


I see people posting full size images all the time on Flickr. Where's the problem?
One can upload giant files, up to 200MB to Flickr; however Flickr will resize all of your mages for display to 2048 pixels in the longest dimension or smaller.

OK, I'll give Flickr another try. I will upload some images later today to Flickr and see how you like them.

Last edited by Fenwoodian; 06-23-2016 at 04:44 AM.
06-23-2016, 06:05 AM - 1 Like   #36
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I have just uploaded some full-sized images to my Drop Box. If you would like to download and view these full sized files just click here.

Last edited by Fenwoodian; 06-23-2016 at 06:29 AM.
06-23-2016, 06:26 AM   #37
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Strange... I can upload to my flickr full sized images jpeg or tiff and it shows full resolution to be downloaded but I restricted original size.

see screenshot
06-23-2016, 07:54 AM   #38
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QuoteOriginally posted by Fenwoodian Quote
1. Helios 44-2 58/2 = 9.0 overall & 9.5 center
I included my Helios 44M 58/2 in a casual shoot-off against a few other of my "fast 50s" using the USAF resolution target. For center sharpness it came in second to the XR Rikenon 50/2 and a small notch above the Pentax-M 50/1.7, Pentax-K 55/1.8, and DA 50/1.8 in that order.

Edit: This was with my K-3. No K-1 now or in the immediate future.


Steve


Last edited by stevebrot; 06-23-2016 at 10:12 AM.
06-23-2016, 08:13 AM   #39
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QuoteOriginally posted by stevebrot Quote
I included my Helios 44M 58/2 in a casual shoot-off against a few other of my "fast 50s" using the USAF resolution target. For center sharpness it came in second to the XR Rikenon 50/2 and a small notch above the Pentax-M 50/1.7, Pentax-K 55/1.8, and DA 50/1.8 in that order.


Steve
Tested with K-1 or K-3?

Maybe there is difference in regards of that...
06-23-2016, 10:11 AM   #40
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QuoteOriginally posted by RAART Quote
Tested with K-1 or K-3?

Maybe there is difference in regards of that...
K-3...and yes, the additional sensor resolution may broaden the spread somewhat.


Steve
06-23-2016, 11:14 AM   #41
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QuoteOriginally posted by Fenwoodian Quote
Below are my "sharpness" ratings from 1 to 10 (10 is perfection on a non-pixel shift shot). Ratings are based on the sharpness of each lens at its' optimum aperture.
i understand your still testing but that list makes no sense without the optimal apertures listed for each lense

oh and thank you for taking the time to do this test
06-23-2016, 02:38 PM   #42
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QuoteOriginally posted by RAART Quote
Strange... I can upload to my flickr full sized images jpeg or tiff and it shows full resolution to be downloaded but I restricted original size.

see screenshot
This is because as the owner you have unrestricted access rights. If you log out or view the image from another computer the full download option will not be there.

---------- Post added 06-23-16 at 11:40 PM ----------

QuoteOriginally posted by Fenwoodian Quote
... however Flickr will resize all of your mages for display to 2048 pixels in the longest dimension or smaller.
But you can always allow us to download the full resolution files.
06-24-2016, 05:01 AM   #43
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QuoteOriginally posted by Fenwoodian Quote
Below are my "sharpness" ratings from 1 to 10 (10 is perfection on a non-pixel shift shot). Ratings are based on the sharpness of each lens at its' optimum aperture.

Click here to see a photo of each lens.

13. MC Zenitar - M2s 50/2 = 4
12. Steinheil Munchen Cassar S 50/2.8 = 6.5
11. Auto Chinon MC 50/1.7 = 8
10. KMZ Zenitar-M 50/1.7 = 8
9. Auto Mamiya Sekor 55/1.4 = 8.5
8. Carl Zeiss Jena DDR Pancolar 50/1.8 = 8.5
7. SMC Pentax-A 50/1.4 = 8.5
6. SMC Pentax-D FA 50/2.8 Macro = 8.5
5. Revuenon 55/1.2 = 8.5 overall & 9.0 center
4. Cosina MC 55/1.2 = 8.5 overall & 9.0 center
3. Voigtlander Color-Ultron 50/1.8 = 9
2. Carl Zeiss Planar 50/1.4 ZK = 9
1. Helios 44-2 58/2 = 9.0 overall & 9.5 center

Pixel Shift using SMC Pentax-D/2.8 Macro = 15-20 ("off-the-charts" sharpness, makes the best lenses I tested in the "non-pixel shift mode" look like they were out of focus!)

As we all know, sharpness is only one characteristic of a photo. There are many other characteristics (e.g. bokeh, color, contrast, vignetting, accurate f stops, subject isolation, ergonomics, etc) that must be considered when giving an "overall" rating to a lens. Anyone want to see my "overall" rating on the above lenses when used on a Pentax K1 camera?
Looking at your order of lens sharpness what I see is the two premium 50mm lenses (The Ultron and the Zeiss) up at the top of the list, while (in general) the 55mm and 58mm lenses join them there. You do realize that a longer focal length lens shows more detail at the same camera to subject distance while showing less of the subject - don't you? I'm sure that if you were to test the fairly crappy 80-320mm lens at the same distance it would handily out resolve all of the lenses you've just tested - simply because of its focal length.
06-24-2016, 07:52 AM   #44
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QuoteOriginally posted by HoustonBob Quote
Looking at your order of lens sharpness what I see is the two premium 50mm lenses (The Ultron and the Zeiss) up at the top of the list, while (in general) the 55mm and 58mm lenses join them there. You do realize that a longer focal length lens shows more detail at the same camera to subject distance while showing less of the subject - don't you? I'm sure that if you were to test the fairly crappy 80-320mm lens at the same distance it would handily out resolve all of the lenses you've just tested - simply because of its focal length.
Right.

Last night I tested my latest lens - a Zeiss ZF 21mm f/2.8 .2 lens that I just purchased. Intend to do a Leitax conversion to it so I can use it on my K1. Anyway, tested it on my 24MP Nikon D7100. Just might be the sharpest lenses I've ever owned. Even better than my Sigma 18-35mm f/1.8 which I thought was very sharp. And hey, this Zeiss is 21mm yet it was sharper than any of the 50mm - 58mm lenses in the above test?? I guess that my sharpness criteria/protocol is independent of focal length after all?
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