Forum: Pentax Full Frame
11-22-2016, 02:20 PM
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My 2 cents...
You seem partial to the 35mm lens and at your core you want that. You want the FA 31, but it has CA. You like the Sigma 35, but it isn't a Pentax and has its own faults.
I think you should pick up a DA 35 f2.4, Why you might ask...
It is cheap, you can buy the replacement to the 31mm when it arrives.
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Forum: Pentax SLR Lens Discussion
10-21-2016, 07:58 PM
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The pentax FA31 is a remarkable lens, it's a weird focal length, with a weird optical design, but it produces superb images. I have only had two copies of the DA35mm f/2.8 Limited macro lens on my test bench and from what I have seen it is an incredible lens, but it tends to be a bit clinical in its rendering compared to the FA31.
Pentax K-1 - SMCP-FA31mm f/1.8 ASPH Limited - ISO 100 @ f/11 30s -
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Forum: Pentax K-1 & K-1 II
10-09-2016, 01:06 PM
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K3 and K5 were much easier to handle with grip with any lens in my opinion. K1 is fine without grip. K1 gives room for one extra finger for holding on to the camera grip.
With 24-70 I prefer no grip, with 70-200 i prefer no grip for walking around, but using the grip adds more stability. Grip always adds more stability and controls for vertical shooting.
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Forum: Pentax K-1 & K-1 II
07-20-2016, 10:58 AM
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On my K-5 I have set custom setting 24 to save the last menu location. Since I rarely go to the menus, and I always reformat the SD card after I've transferred the files, the menu button usually opens at the format function. I'm not sure if this is the best way to easily reformat on a K-1, but it works for me on the K-5.
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Forum: Pentax SLR Lens Discussion
05-11-2016, 05:33 AM
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That's exactly it. In more simple terms (just in case), a change in refractive index (determined by the nature and density of the material, be it glass, plastic, water, etc) brings a change in the path of light. Lens design involves taking rays of light and bringing them to a desired spot on the sensor. To achieve this, you play with the number of elements, their position, curvatures and materials. Talking about "groups" simply means that, for your design, you require some elements to touch.
There are so many!!! Literally hundreds of choices. Mainly their differences regard refractive indexes, but their light transmission also differs (not all glass transmit all colours in the same way), as well as their absorption , and so forth.
Lens design is a science and an art, and selecting the right glass types is a large part of that.
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