At 8:1 magnification, 35mm format lenses will cover.
A point that many don't realize! And not much bellows is needed.
With a negative the same size, or larger than your subject you will always be fighting with limited depth of field.
But, you many know that and intend to use that to your advantage.
In terms of lenses, your choices are plentiful. For example, at 1:1, all 4x5 format lenses cover 8x10. At 8:1 magnification, 35mm format lenses will cover.
The answer will depend on the range of subject distances you will use.
For very close focusing, you’d likely need a relatively short focal length lens designed for excellent resolution within the subject distance range you intend to use. The projected image must fully cover the corners of the film at the farthest subject distance at which you’d use it (where the image is smallest).
A lens made specifically for close-up photography might be the best choice. One of the best such lens is the 210 mm f/5.6 Nikkor AM ED (AM = Apochromatic Macro lens). It is intended for high grade macrophotography on the 8” x 10” format at around 1:1 or greater magnification
https://www.mr-alvandi.com/downloads/large-format/nikon-large-format-lenses.pdf
Due to its short focal length, it has limited far-distance use on the 8” x 10” format. Using 310 mm as the diagonal of the film visible in the holder, the far limits of magnification and subject distance are:
0.974 X and 425.5 mm at f/5.6 (41º coverage angle)
0.547 X and 593.6 mm at f/22 (51º coverage angle)
Subject distance is measured from the subject plane to the first nodal point of the lens. On this lens, the first nodal point is 11.9 mm forward of the flange (the flange is positioned the same as the front surface of the lens board).
If a 210 mm macro lens is too limiting, you’d need a longer focal length lens to project an image sufficiently large to cover the corners of the film. A good choice would be a 300 mm lens, such as the 300 mm f/5.6 Nikkor W. It too can produce fine results at relatively close distances and has no far distance limit, as it can be used all the way to infinity focus on the 8” x 10” format. It might be difficult to use in very close photography because that would require moving the lens rather far from the film to focus.
For example, if you wanted to photograph at 1:1 magnification, a 300 mm lens would require placing it so that its second nodal point is 600 mm from the film plane. The 210 mm macro lens would achieve 1:1 magnification with its second nodal point at 420 mm from the film.
Whether or not a 300 mm lens would work in your situation is determined by the bellows limit of the camera. Can you place the lens far enough from the film to focus at the magnification you require?
It might be the case that you’d need two lenses, a short focal length macro lens for very close focusing, and a second longer lens for shots at greater distances.
by 1:1 what exactly do you mean?
For 8x10", 1:1 (1X) = 8x10". The subject is the same size as the film.
A subject about 4x5" -- like the two pictures above -- is about 2:1 or a 2X magnification. As koraks also mentioned, a 150-250mm lens will work fine for you, and there are many process/macro/close-up lenses in that range to choose from.
1cm in reality = 1cm on the negative.
I'd use a relatively short lens for the kind of work you have in mind. Something in the range of 150-250mm focal length. I sometimes do close-ups (around 1:2, half life-size) with a 300mm lens and the bellows draw is already quite long when doing so. For even larger magnifications as in the examples you posted, I'd definitely resort to shorter lenses as it'll make life overall a lot easier. I've occasionally used a Symmar-S 210/5.6 for this kind of thing and it works fine. Evidently it doesn't even begin to cover 8x10" focused at infinity, but for close-up work, that's not an issue.
What does that mean exactly? the 8x10 negative will not be fully used in an instance where focused to infinity?
For close ups i can cover the whole 8x10 negative with a frame?
if you're just talking about the scale of potted plants or floral arrangements, many 8x10's have plenty enough of bellows draw to accommodate 300 and even 360mm lenses for that kind of distance range.
close-ups, not moderate distance tabletop shots
monorail cameras like Sinar make a lot of sense because the length of rail and bellows sections can be so easily reconfigured to anything necessary.
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