I have a medium format crop factor question I am hoping someone can explain to me like I'm a 5th grader. I don't want to get into the determination of crop factors, different aspect ratios, area or hypotenuse measuring, or sensor size. The web is full of incorrect information. I ran into the idea of applying this f-stop crop factor to the lenses maximum aperture. Probably everyone has noticed that medium format lenses have a more narrow DOF wide open, and maybe this was a way to try an explain it? On the Pentax 645Z the crop factor 0.785 - which makes all f2.8 lenses effectively f2.2 on medium format? My brain just can't accept this notion. The manufacturer made the lens for that format and rated it f2.8? It isn't letting more light in than it's rated speed. It only seems to describe an approximation of the 35mm equivalent dof. What am I missing?
James Markus wrote:
I have a medium format crop factor question I am hoping someone can explain to me like I'm a 5th grader. I don't want to get into the determination of crop factors, different aspect ratios, area or hypotenuse measuring, or sensor size. The web is full of incorrect information. I ran into the idea of applying this f-stop crop factor to the lenses maximum aperture. Probably everyone has noticed that medium format lenses have a more narrow DOF wide open, and maybe this was a way to try an explain it? On the Pentax 645Z the crop factor 0.785 - which makes all f2.8 lenses effectively f2.2 on medium format? My brain just can't accept this notion. The manufacturer made the lens for that format and rated it f2.8? It isn't letting more light in than it's rated speed. It only seems to describe an approximation of the 35mm equivalent dof. What am I missing?...Show more →
I may be reading your question wrong but exposure wise the lens is still an f2.8. I think with the crop factor they are saying the DOF is an f2 equivalent.
fotografur wrote:
I may be reading your question wrong but exposure wise the lens is still an f2.8. I think with the crop factor they are saying the DOF is an f2 equivalent.
Thanks Dennis. That must be it. I simply found another example of inaccurate info. The pre-release video referred to it as "equivalent light gathering ability" - when it was merely referring to DOF.
Jim
Creative Edge wrote:
Hi there Bruce. I was using the 100sII and the GF 500mm, I also have the Z9 and a 500 f4 FL but prefer using the Fuji.
I only use the Z9 when shooting sports, everything else I prefer the 100sII. I love the IQ of the Fuji, these were shot inside a dark canopy in the jungle and the ISOs were through the roof, yet they clean up incredibly well. Cropping was not much at all, I learned that if you stay still in the jungle for a while, it really comes alive and the birds can land pretty close to you. These were not taken in the Eco Lodge type settings where they put food out for the birds. ...Show more →
I meant to reply to this earlier...
Thanks for the gear info. I suspected that you were using the GF 500mm. You and Kalani appear to the be the two on FM who are using this pair for wildlife photography. I primarily rely on Nikon Z9/Z8 w/ a variety of telephoto opics and love what I can do with them, however, I do recognize the beautiful color depth and details one can get with the 100MP MF sensor.
With respect to Costa Rica, I have been many times and photographed the birds that you have shared. Even though I've taken 9 or 10 trips of photography, I've never shot on a photographic tour/workshop and thus sweated (literally and figuratively) for the shots I've taken. My work is not done around feeders, though I'll admit that I'd love to get a few "perfect" shots on rich mossy logs.
OwlsEyes wrote:
I meant to reply to this earlier...
Thanks for the gear info. I suspected that you were using the GF 500mm. You and Kalani appear to the be the two on FM who are using this pair for wildlife photography. I primarily rely on Nikon Z9/Z8 w/ a variety of telephoto opics and love what I can do with them, however, I do recognize the beautiful color depth and details one can get with the 100MP MF sensor.
cheers,
bruce
Beautiful work with stunning colors in Costa Rica, Michael! As Bruce points out, I also really enjoy the 100sii/500 for (large) wildlife, plus 1.4x TC in the summer, but am thrilled with the recent Boryoza GF-NZ adapter for added flexibility with the GF primes on the z8 when desired. I'm pleased after trading the x-h2s system for z8 with added cropability, DR, and now ability to adapt GF lenses. Too bad there's a physical limitation on adapting Z->G direction, but one way is still great.
Wish list for z8ii is pre-capture RAW, and 100iii/siii is Nikon's sensor protector while changing lenses (aside from higher fps and AF ofc). The magpie below is about as fast as I can react to a medium-sized bird on either system!
OwlsEyes wrote:
I meant to reply to this earlier...
Thanks for the gear info. I suspected that you were using the GF 500mm. You and Kalani appear to the be the two on FM who are using this pair for wildlife photography. I primarily rely on Nikon Z9/Z8 w/ a variety of telephoto opics and love what I can do with them, however, I do recognize the beautiful color depth and details one can get with the 100MP MF sensor.
With respect to Costa Rica, I have been many times and photographed the birds that you have shared. Even though I've taken 9 or 10 trips of photography, I've never shot on a photographic tour/workshop and thus sweated (literally and figuratively) for the shots I've taken. My work is not done around feeders, though I'll admit that I'd love to get a few "perfect" shots on rich mossy logs.
I agree about photo tours, I much prefer the challenge of planning and executing the shots myself. This was a family trip so I did limit the photography time. It is less than a 3 hour direct flight from me and I have a hook up at a really nice lodge so I will be going back in the next couple of months for just photography.
As I mentioned I have the Z9 and the 500 F4 but prefer the IQ of the Fuji. I do love the instant AF on the Z9 but that is about it.. lol.
kalani_kane wrote:
Beautiful work with stunning colors in Costa Rica, Michael! As Bruce points out, I also really enjoy the 100sii/500 for (large) wildlife, plus 1.4x TC in the summer, but am thrilled with the recent Boryoza GF-NZ adapter for added flexibility with the GF primes on the z8 when desired. I'm pleased after trading the x-h2s system for z8 with added cropability, DR, and now ability to adapt GF lenses. Too bad there's a physical limitation on adapting Z->G direction, but one way is still great.
Wish list for z8ii is pre-capture RAW, and 100iii/siii is Nikon's sensor protector while changing lenses (aside from higher fps and AF ofc). The magpie below is about as fast as I can react to a medium-sized bird on either system!
