![]() ![]() Assuming we have a 12" and a 16" lens, both giving a life-size repro at 1:1. I've read this statement a number of times, and it confuses me. The formula should tell you the right numbers but interpreting them can be very difficult. Since 35mm cameras don't usually use a bellows to focus and since the flange focal depth must always be the same, they are designed so the lens nodes are in strange places. ![]() View camera lenses aren't usually that far from a thin lens but a 35mm type lens is, as are tele design lenses for view cameras. In reality, this is almost never the case, though. These equations are for "thin lenses" which have the front and the rear node in the same place. These calculations won't work well for 35mm type lenses. If I plug in numbers for a 35mm camera, an 85mm lens gets you about the same magnification. It's been a while since I did any amount of optical math. That just doesn't sound right to me.Ĭhristopher's calculation of 2040 mm distance is correct. So, the general consensus is that 450mm would get me to head and shoulders on 11x14 with no distortion of noses, shot straight on? Using ViewFinder Pro, this tells me I would be 24" or so away from the subject to get a head and shoulders framing. I know the distortion seems LESS as you move up in formats, but at least in 8x10, I still did see distortion quite significantly when you came in close enough to get head and shoulders with a 14" lens. Look for shorter focal lengths and you also save on bellows reciprocity failure due to the lesser bellows extension to get to your desired 1:1 ratio, thus making your sitter less likely to move over long exposures. As you can see there is no distortion at all. ![]() This photo is bigger than he is I would say about 1 and half life size. 20 x 24 with the above mentioned Schneider 550 wide open f-11 about 20 inches from the my son's face. This old picture I've posted in several threads (please forgive the re-post) exemplifies the point. Many of the two times life size that you see done on the 20 x 24 Polaroid are done with a 355 G-Glaron inches from their face. All of my head and shoulders on my 20 x 24 are shot with 550 Schneider Fine Art lens. Wisner wrote an article years ago about the anomaly that you might find on line. One of the interesting things about the ULF is as you move up in format what is considered wide angle does not render distortion on faces as does in 35mm. ![]()
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