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- Jul 14, 2011
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- 8x10 Format
If you are going to do a lot of close-up work with a 8x10 camera get one where focussing is done by moving the back not the front.
Front focussing changes the distance between the lens and the subject which in turn changes the framing and the magnification.
There are combinations of subject distance and lens focal length where racking the front of the camera back and forth never finds focus at all. Most frustrating!
Hey, you don't have to be a 8x10 shooter to appreciate the benefits of REAR focus. Admittedly, most 4x5 cameras lack this feature (although some do move FORWARD, at least), but it sure makes matters a lot easier.
I'm jumping in with what is likely a very basic question. Let's say I'm photographing a Quarter. They are just shy of 1" diameter (24.26mm I think) If I wanted the quarter to be 2" diameter on the ground-glass is that 2:1 or 1:2 ?
Years ago I bought a Wollensak Micro Raptar, 115mm, f12.5. Tiny little barrel lens that supposively covers 8x10. I'll use it one of these days...I'd have to whip up a lensboard and a good reason to do it.
Otherwise, there are many process lenses in barrels to play with.
There are also countless small format and movie camera lenses that can be mounted to a thin metal plate via the filter threads, and the plate mounted to a lens board. The thin metal plate might be eliminated by epoxying the filter (perhaps with the glass removed) directly to a lens board. One problem with doing this for many view cameras is the front of the camera blocking appropriate light from the subject. A reflector around the lens might help with this.
more on the softer side
Fujinon lens maybe?
Something badly scratched on the front element perhaps?
Apart from actual soft focus lenses and very crude, simple optics, pretty much everything made for large format over the past century or so is pretty sharp pretty much all of the time. Opening up the aperture helps of course.
I don't think they're particularly soft, really.
This is large format. Lens imperfections esp. w.r.t. sharpness drop away *fast* against the sheer surface area you're working on.
Fujinon 5.6/250 SF
Regarding post #42: The Fujinon 5.6/250 SF (Soft Focus) might be the lens you were asking about.
The Fujinon 5.6/250 SF is a modified Cooke triplet that’s quite soft wide open. These are mounted in a Copal 3S shutter. It’s softness is variable from f/5.6 and is fully sharp by about f/11 or so. Of course, altering the aperture also varies the depth of field. It’s most used for soft focus portraits and misty-renditions of landscapes and so forth on the 4” x 5” and 5” x 7” formats.
It has a 300 mm infinity-focus image circle and 58º coverage angle. It will cover the 314 mm diameter diagonal of an 8” x 10” holder beginning at magnification m = 0.133X (subject distance of 19 meters and closer).
The Fujinon SF lenses are originally supplied with two modifying discs—Fuji called then “grids”—that attach to the rear of the front cell. The front cell is easily unscrewed from the barrel for grid changes. The lens is useable with either of the two grids, or without a grid attached, depending on the effect you want.
https://www.pacificrimcamera.com/rl/00910/00910.pdf
The following was transcribed from a Fuji SF lens data sheet:
How to use Fujinon SF lenses
“ The spherical aberration of these lenses has been retained to enable them to produce the desired effects. Thorough acquaintance with the effects they will produce is therefore necessary in order to make the most of what they can offer because the picture will turn out differently depending on how they are focused or defocused as well as on the aperture used and on whether or not the picture is taken with the grid on or off and the type of grid used.
Focusing
The intended effects may not be possible if the lens is first focused with the aperture fully open then afterwards closed down to take the picture. The correct focusing procedure is outlined below.
1. Focusing the lens with the aperture set for exposure. With soft focus lenses the case is not the same as other type of lenses in terms of focusing. It is advisable to adjust lens while watching the soft effect it will produce.
2. Focusing the lens with the aperture closed down. The aperture is set for exposure then closed down by 1 or 2 stops for focusing the lens on a vital point of the picture, e.g. on the catchlight in the case of portraits. The aperture is then reset for making the exposure.
How to use grid
The grid enables the Fujinon SF Lenses to yield maximum soft effect picture
1. To mount a grid on the lens
2. Normally, the standard soft effect is produced at F9 using the Yellow grid or F10 using the Red grid
3. The grid requires the use of aperture differing from those for normal aperture.”
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