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Forum: Pentax Medium Format
05-22-2018, 12:26 PM
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Had you merely mentioned the words "on film" in your original post, I would not have been confused. Got it.
In this film-based investigation, you are limited by what your eyes can see on a paper print.
I would suggest a better crop vs TC comparison would occur by inspecting digital images at the pixel level. I understand now that was not your intent.
no worries.
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Forum: Pentax Medium Format
05-22-2018, 11:05 AM
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printing? old days? enlarger? :eek:
OK, you are seeking to answer a different question altogether. I thought you were attempting to test whether it is better to use a TC versus cropping pixels on the SAME lens. Re-reading this, that is not your intent here.
If I read this right, you are asking whether a hypothetical 215mm lens fitted with a 1.4x TC compares favorably to a 300mm lens. Why?
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Forum: Pentax Medium Format
05-22-2018, 09:34 AM
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Rick, thanks for this but can you elucidate you process a little more re: your Question#1?
Wouldn't you need to be upsampling the 300mm image to match the larger image size obtained by the 300mm+TC configuration? In a real world situation requiring a teleconverter, you would be discarding half of the pixels of the 300mm file and would need to upsample that to match the resulting image square of the 300+TC, no?
I have done this testing as well and arrived at a very different result. Though it is surely rig-specific, I have concluded that optics win over cropping and magnifying pixels. Help me understand. thanks!
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