Re: GFX100S worth it if ONLY planning to use adapted lenses?
ruthenium wrote:
I have taught university students for the last 30 years; thus, I know that an average human being regularly makes mistakes, and when this happens, this is normal.
Basically, it is best to treat others with the understanding that no one is perfect, rather than with the unrealistic expectation that my neighbor should never make mistakes.
Another human problem is the difficulty of expressing thoughts clearly and unambiguously. This problem might be behind the present discussion and disagreement.
Assuming that what Dan meant from the start was about the crop factors (when he referred to the "differences") and not about the mathematical "difference", then I agree with him on "the meaningful difference when it comes to sensor size comparisons the one expressed by crop factors".
For example, the GF500MM lens on a GFX has the FL equivalent to near 400mm on FF. However a 500mm FF cropped to the APS-C format is equivalent to 750mm. The focal length "differences" are about 100mm between the GFX and FF, and 250mm between FF and APS-C. The latter being considerably larger.
If this is what Dan referred to, then I agree with him.
The crop factor is indeed the single photographic parameter behind the equivalence calculations. It is the crop factor that tells me that my GFX can capture one stop more light at the base ISO when compared to my A1 at its base ISO.
That is exactly what I meant. “Difference” can be expressed in more than one way (e.g. as a percentage) and not all scales are linear. Since I had already decided not to “beat that horse” in this thread any longer, I’ll leave it at that… except to thank you for the reply that I might have written concerning “meaningful differences.”
(As i wrote earlier, beyond confirming yiur hunch about that pointI in my earlier post, won’t continue that factual discussion in this thread.)
As a sometimes user of adapted lenses on a different system — lenses that are also used by some on GFX — depending on the sort of use you put them to they can sometimes be fine options. (In my case I use a Mirex TS adapter with Pentax MF zoom lenses on a FF system for some landscape work where movements are useful and where I’m happy to manually focus and deal with manual aperture control.)
Regarding my distinctly non-first-person experience with GFX lenses (which is admittedly very limited but not zero), a friend of mine has spoken to me in very positive terms about his experience with the GFX 100-200mm lens for his landscape photography, FWIW. (If you are a landscape photographer and don’t know about him, you might look into him, his work, and his background a bit.)
Jun 04, 2026 at 05:09 AM
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