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Forum: Pentax SLR Lens Discussion
07-24-2020, 07:38 AM
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Forum: Pentax News and Rumors
07-21-2020, 10:01 PM
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Forum: Pentax K-1 & K-1 II
07-04-2020, 02:21 AM
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(DFA*50 @ f/4, ISO100, 1/30s)
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Forum: Pentax SLR Lens Discussion
08-04-2019, 11:02 AM
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During the years buying lenses and cameras on Marketplace I collected some standard lenses as colateral damage… :). This afternoon I had nothing to do so the ideal moment to compare them on 36 MP on center sharpness, corner sharpness and bokeh.
The wariors:
The M1.4 is my original, I bought this in the late 70-ies as kit lens on my ME-super. In the days of film my best results were shooting at F2.0 for nice bokeh and acceptable sharpness, and at F5.6 for tack sharp images. Shooting wide open was tricky, I always was very keen on precise focussing using my split screen, so I suspect the film was not always flat on the slider or the distance to film and mattglass was not exactly the same.
On the K1ii focussing is much more precise. Test scene again is my backyard on a sunny day. I focussed on the outer leaves of my oleander and checked the focus with live view. The DFA kit lens was the benchmark.
The test scene: (M1.4 wide open)
Center sharpness at F2.0:
Corner sharpness at F2.0: (I focussed right in the center with focus confirmation and turned my camera so the opbject moved to the right upper corner)
Bokeh at F2.0:
Center sharpness at F5.6:
My overall conclusion:
M1.7 is the best, A1.7 is very similar. A little bit CA around highlights. M1.7 is beautifull constructed, the A1.7 feels plastic with a horible aperture ring. Only usable in A-mode.
M1.4 is very good either, only corner sharpness at F2.0 stays a little bit behind the 1.7. You have a bonus for 1.4 for extra less DOF and extra dreamy bokeh. With live view focussing is very reliable nowadays. Beautiful lens even after 40 years of service.
M2.0 is the weaker one. Less sharpness at F2.0 but also at F5.6. At 2.0 it is ghosting in the far corners. It also clearly has a different coating than the others and one lens element less. This is a budget lens.
K1.8 is not as crisp as the 1.7 and 1.4 are, but decent sharp and good corner sharpness too. Almost no CA at F2.0. This lens is build like a tank and still working fine despite it is the oldest of all.
Bokeh is very similar at F2.0.
All these lenses have the advantage of a larger aperture so you can isolate your objects. The kit lens starts at F4.5 at 50mm.
Compared at F5.6 all lenses perform equal with the kit lens at F5.6, only the M2.0 still stays behind a little bit even then.
Cheers!
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Forum: Pentax SLR Lens Discussion
06-22-2020, 09:41 AM
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Ok a short opinion. I am lucky to get this early sample of the lens for a test. I will write down an longer first impressions in a few days when I have checked out all things I want to find out. But IQ wise this is a reference, not only in Pentax world. I did some night shots and from 1.4 on it feels you have around 85 to 90% of it's resolution.
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Forum: Post Your Photos!
05-13-2020, 05:41 PM
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Using a lensball to create a bit different composition.
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Forum: Post Your Photos!
05-23-2020, 12:34 AM
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Before i started an astrophotography session i got to see the sunset.
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Forum: Lens Clubs
03-17-2019, 08:44 AM
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At the Great Salt Lake Shorelands Preserve _KP05613.jpg by Michael Stahulak, on Flickr
To Murray: I promise to get this lens on a tripod, ASAP!!;)
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Forum: Lens Clubs
03-11-2019, 05:53 PM
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Sometimes I'm lucky enough to naturally wake up for golden hour on the river. Today was one of those glorious days. DA560 on KP.
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Forum: Lens Clubs
01-16-2019, 08:32 AM
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DA560 on K-70
Loving this new lens and camera !!!
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Forum: Lens Clubs
06-10-2019, 01:42 PM
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Not much traffic here ...
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Forum: Pentax KP
06-30-2019, 01:00 PM
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With the F 85mm Soft:
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Forum: Lens Clubs
06-17-2019, 10:13 PM
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Sigma EX 105/2.8 Macro
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Forum: Lens Clubs
06-17-2019, 08:56 PM
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Nice image, Walt!
---------- Post added 06-17-19 at 11:35 PM ----------
Butterfly Weed.
Got a Chinese Zhong Yi Freewalker 4-4.5x F2 macro from B&H around Christmas time. DOF is quite shallow. Most people (including me) will not get much in the line of usable images unless they focus stack.
This is one of the first stacks taken with the lens. Unfortunately I did not record the aperture value. Probably at 5.6 to 8. The manual recommends taking images at f2. This was taken at 4x on the K-1. Approximately 70 images. To really get a sharp image, one needs an automated rig. This is at the limit of what I can do with hand adjusted macro rail, so take that into account when you look at the image.
The second image (crop) is of a different butterfly weed flower with an ant approximately one-half cm long.
The third image is of the same flower as the first image, and shows what happens when an ant photo-bombs (ruins) my stack!
I knew I had a few dust spots. But not the extent of it. High Magnification lenses will highlight every single dust spot, and leave bad trails when stacked. I opened the stack in camera raw, healed 30-40 spots, synchronized spot removal, saved the stack then re-assembled in Zerene Stacker. I missed one spot that I had to clone out later.
Butterfly Weed
Ant on Butterfly Weed
Butterfly weed with photo-bomber |
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Forum: Pentax K-1 & K-1 II
05-29-2019, 08:35 AM
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This amazing lens works very well on K-1, I like the color and the bokeh. photo is jpeg direct output,resized only. |
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Forum: Pentax SLR Lens Discussion
05-17-2019, 01:12 PM
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Forum: Pentax SLR Lens Discussion
04-30-2019, 09:07 AM
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Kiron 105mm
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Forum: Pentax SLR Lens Discussion
05-06-2019, 08:52 AM
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Forum: Pentax SLR Lens Discussion
05-07-2019, 11:45 AM
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Forum: Pentax SLR Lens Discussion
05-06-2019, 11:07 AM
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Forum: Pentax SLR Lens Discussion
05-13-2019, 12:25 PM
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Forum: Pentax SLR Lens Discussion
05-15-2019, 12:29 PM
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Forum: Pentax SLR Lens Discussion
05-15-2019, 01:32 AM
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Forum: Pentax SLR Lens Discussion
05-14-2019, 01:21 PM
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