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Forum: Pentax SLR Lens Discussion
03-13-2018, 08:25 AM
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Generally with the old non-af tc's, the number of elements can indicate which is a better tc, 7 being probably better than 5.
If you intend to hand hold, use a suitable shutter speed. e.g. 1/600ths of a sec or faster for a Pentax-M 200mm.
As has been mentioned, the tc will multiply the lens's inherent problems.
This is an image taken with a Vivitar 300mm F5.6 and a Vivitar 1.5x tc. Colour fringing is evident in the high contrast areas above the squirrel.
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Forum: Pentax SLR Lens Discussion
03-13-2018, 06:50 AM
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You should expect the lens losing 2 stops of light, the amount of light reaching the camera is reduced so if you are shooting at F:8, you will get the amount of light you would have expected at F:16.
You will probably notice a marked reduction in image quality too when comparing results to those achieved without the tc.
However, you do have effectively a 400mm FL lens with the tc.
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