Peter Figen wrote: MAubrey wrote: Peter Figen wrote: mmm55 wrote:
Trying to sort things out. I understand how the Kipon 0.8x adapter affects focal length, fov and dof. But ... what would be the effect on the 1:1 reproduction ratio of the Contax 645 120mm?
Can't imagine why you'd need to change the effective focal length of that wonderful macro. Just use it without any extra glass and enjoy it. I'm going to guess that if you use that Kipon adapter you're going to lose your 1:1 as the image is going to be twenty percent smaller at the same distance. At least that's how my brain is working at the moment.
I suppose it depends on whether your goal is magnification or to get as close as you can to the original 645 experience of the lens. The latter can only be achieved with the focal reducer.
You're not shooting 645 anymore, so what does it matter. The only thing that matters is if that focal length works for your shot, and so far, in the last little over a year, I have not once said to myself, "oh crap, I wish I had a 96mm lens rather that this 120". Not for a macro anyway. And for the Contax 350mm f/4, well, that's exactly where I want it to be - at 350mm and not an effective 280.
If you really want the experience of shooting a Contax or Pentax or Mamiya 645, there are plenty of them out there and affordable too. You're the very first person I've heard try and make the argument of staying "true" to the original film camera that those lenses came from. I had no idea it was even a thing, and it's probably not, but hell, go and buy that adapter and have fun with it. Show us the results.
All of the compressors from the metabones speedboosters to this kipon 0.8x will increase effective MTF and light gathering capacity.
If one desperately needs the 96mm f/3.2 t/4.0 (in FF terms) of using the lens without the 0.8x then you can have that. If you want the sharper 77mm f/2.5 t/3.2 equiv of using this lens with the 0.8x adaptor that is available to you also.
Many tools exist for many people to get the results they want. None are invalidated simply because you personally haven't found the need.
Jun 12, 2023 at 08:10 PM
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