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#11
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MF resolution question
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#12
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MF resolution question
Generally, prints from MF negative look better. The lenses for 35mm and MF
(these days) have similar resolutions, and you get effectively about 50 lines per millimeter (1270 dpi) with reasonable contrast. An 8X enlargement from 35mm is about 160 dpi, while a 5X enlargement from a small MF negative is about 250 dpi. That's quite a difference. The actual resolution you get (or need for sharp looking pictures) may vary with the camera, lens, technique, film, or circumstances, but these figures are typical and representative. The bigger negative is an advantage, even for an 8X10 print. "Faisal Bhua" wrote in message om... Hello, I have a question for the folks using medium format. My question is, does 35mm give identical result to MF up to 8R (8x10) prints? The math seems to point that way - here's how: 35mm frame size = 24x36 mm sq = 1.339203 sq inch Given, a 300 dpi print is considered to be a "museum quality" print. 8x10 print = 8x10x(300)^2 = 7,200,000 Therefore, scan dpi for 35 mm film = sqrt (7,200,000 / 1.339203) = 2319 dpi Now, 35mm film is supposed to have a theoretical resolution of 4000 dpi. That may be a matter of opinion, but it's certainly more then 2319 dpi. So is there any justification for using MF if 8R is the maximum size you print? I've read MF guys claiming that old Yashica TLRs outperforming Nikon SLRs, so I'd like to see some hard evidence behind this. Feel free to point out any errors I've made - I'm new at this :-) Also, is film grain a factor? About me: beginner, shooting b&w in Minolta X-700, I make my own prints. Eying MF (esp. TLRs) gear recently. |
#13
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MF resolution question
Hi
Again total system detail inputs are 1. Focal length 2. Resolution 3. Distance Film size has nothing to do with image detail. Example, take two wedding photographers photographing a wedding party at 20 feet. One using a Hasselblad with a 50mm lens and 160 ASA film. The other photographer using a Nikon with a 50mm lens and that same 160 ASA film. The detail in the dress will be exactly the same. The only real difference is the Hasselblad photographer images more people in the wedding party because of the wider angle. So now play with the math. Larry |
#14
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MF resolution question
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#15
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MF resolution question
No, it won't.
Sorry but yes it will. Equal lens, equal distance, equal resolution means equal detail. Larry |
#16
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MF resolution question
Hemi4268 wrote:
No, it won't. Sorry but yes it will. Equal lens, equal distance, equal resolution means equal detail. Larry Absolutely. An example, take an 80 mm lens for a Hasselblad, and use a mount adapter to place it onto a Nikon SLR. Using the same film in the 35 mm Nikon, and the Hasselblad, an identically sized slice from either film (24 by 36 mm) should show exactly the same resolution (detail). However, in practice not even all 50 mm lenses for various 35 mm systems have equal resolution, nor do all 80 mm lenses for medium format have the same resolution. While the differences might be slight, or barely perceptible, they will always be there. Outside of using your medium format lenses on 35 mm cameras via mount adapters, the problem is that there are not equal lenses. Only Contax has an easy solution of using the same 645 lenses on their N body for 35 mm. All other companies lenses are not equal, and comparing focal length only is overly simplistic. Ciao! Gordon Moat Alliance Graphique Studio http://www.allgstudio.com |
#18
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MF resolution question
However, in practice not even all 50 mm lenses for various 35 mm systems have
equal resolution Actually they do. What you mean to say is not all 35mm bodies have the exact same mirror focus position. A perfect lens will have the following resolution and depth of focus in noon summer sun. f-1 2000 lp/mm 1 micron of DOF f-2 1000 2 f-4 500 16 f-8 250 64 f-16 125 256 You can see that at f-4, the mirror must be within 16 microns to be perfect. A human hair is 400 microns. Typical standard for most good camers is about + or - 50 microns for the mirror position. You have to get to about f-8 for everything to be equal. Larry |
#19
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MF resolution question
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#20
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MF resolution question
Gordon Moat wrote in message ...
Hemi4268 wrote: No, it won't. Sorry but yes it will. Equal lens, equal distance, equal resolution means equal detail. Larry Absolutely. Absolutely false An example, take an 80 mm lens for a Hasselblad, and use a mount adapter to place it onto a Nikon SLR. Using the same film in the 35 mm Nikon, and the Hasselblad, an identically sized slice from either film (24 by 36 mm) should show exactly the same resolution (detail). False However, in practice not even all 50 mm lenses for various 35 mm systems have equal resolution, nor do all 80 mm lenses for medium format have the same resolution. While the differences might be slight, or barely perceptible, they will always be there. True, contradicting the two prior statements. Outside of using your medium format lenses on 35 mm cameras via mount adapters, the problem is that there are not equal lenses. Only Contax has an easy solution of using the same 645 lenses on their N body for 35 mm. All other companies lenses are not equal, and comparing focal length only is overly simplistic. Ciao! Gordon Moat Alliance Graphique Studio http://www.allgstudio.com |
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