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Forum: Pentax Q
05-30-2020, 01:36 AM
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The Schneider-Kreuznach Makro-Tele-Xenar 75mm F2.8 is a C mount lens, unfortunately differently from the lenses in D mount his best aperture is not that wide but is 5.6 even if is not bad more open, because of that and the fact it is between my two sharpest K lenses as focal I put that with them.
The SMC Pentax 50mm F1.4 is very soft and with many color problem at F1.4 and so is completly unusable on this small sensor, at F2 is a bit less soft and don't have color problems, at f2.8 is good without color problem and quite sharp and at F5.6 is very good.
The Schneider-Kreuznach Makro-Tele-Xenar 75mm F2.8 is quite sharp at F2.8 but present some color problem, at F5.6 is very good.
The SMC Pentax-FA 100mm F2.8 Macro is soft at F2.8 and at F5.6 is very good.
As a Macro the Schneider 75mm reach only a 1:2 ratio and if compared with the Pentax 100mm at the same ratio both do their best at 5.6 but probably the Pentax is slightly better, at higer aperture (4 and 2.8) the Schneider 75mm is clearly better than the Pentax 100mm, at lower aperture they do not have many different optical quality.
A good thing of the Schneider is that is fairly small and so easy to bring in wathever occasion.
The photos are
1 and 2: Schneider 75mm at F5.6 and a crop at 100%
3, 4 and 5: Pentax 50mm at F1.4, F2 and F2.8
6: Schneider 75mm at F2.8
7: Pentax 100mm at F2.8
8 and 9: Pentax 50mm at F5.6 and a crop at 100%
10, 11 and 12: Schneider 75mm at F5.6 and two crop at 100%
13, 14 and 15: Pentax 100mm at F5.6 and two crop at 100%
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Forum: Pentax Q
09-09-2019, 01:28 PM
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A photo of the moon at 320mm.
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Forum: Pentax Q
09-08-2019, 10:35 AM
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About a month ago arrived my Q camera (a Q-S1), now I tried to test some optics including the 80-320mm and at his best aperture (the one that is 8 at 80mm and betwin 8 and 11 at 320mm) in my opinion did well for a not very expensive zoom lens.
Some test photo take on a tripod at the best aperture; the photos are from the raw witout post production.
The photos are at 320mm, 200mm, 100mm and 80mm, each one followed by a crop at 100%.
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