There are Dagors that fit that description. I have an 8.25" f:6.8 in an Ilex 3 shutter, and I've seen a 180mm.
I'd quite like a new multicoated lens that doesn't have the dagor tax on it...
Lachlan, Dagors and Aldis Unos are the two anastigmats that would benefit least from multicoating. Each has only four air-glass interfaces.
If you want Dagor types that don't have the Dagor cachet and price, look into Boyer Beryls and f/6.8 Berthiot Eurygraphes.
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[TD="colspan: 1"]Along with the Verito in 1911, Wollensak introduced the Velostigmat Series II lens with a speed of f/4.5. This lens was marketed as a "high speed Anastigmat." It was produced in sizes with coverages ranging from 3.25x4.25 inch to 11x14 inch, with a diffusion feature on the three largest sized lenses (6.5x8.5, 8x10, 11x14). The user was able to twist the front part of the barrel causing the front element to move out of position to add diffusion. There is a scale marked with 5 settings on the front barrel edge to denote the various diffusion amounts. This feature allowed Wollensak to market this lens as a sharp general purpose lens that also allowed diffusion to be added at any f stop. This differed from the Verito where the aperture selected determined the amount of diffusion. The August 1911 issue of Camera Craft Magazine wrote, "The Wollensak Optical Company had a most complete exhibit of photographic lenses and shutters in their booth at the St. Paul Convention. The line included several new and interesting lenses and shutters. The Series II Velostigmat, F-4.5, recently perfected, is a remarkable lens, having all the good qualities of an Anastigmat. The three larger sizes are equipped with an ingenious device whereby the operator is enabled to obtain any degree of softness or diffusion he may desire. As this lens has a field that is absolutely flat, any diffusion introduced by means of the diffusing device will result in an equal diffusion or softness over the entire plate. This diffusion is by no means what is termed "fuzzy" and no ghosts, or double outlines result, as is the case with some lenses intended for soft focus." By 1911, Wollensak was able to offer photographers the Vitax, Verito, and Velostigmat Series II lenses, all with distinct purposes and with various types of diffusion methods, and as such, the three lenses were frequently advertised together.[/TD]
I saw this info about an interesting lens today:Wollensak Velostigmat Series II f/4.5
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I would like a lens like this as well. A 12" lens did cover 8x10" and a 15 1/2" lens did cover 11x14".
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Bert, can you spell Tessar? That's what it is.
Moving the front element of a Tessar by a small amount will have an impact on spherical aberration... Which I am assuming "diffusion" = soft focus = spherical aberration.
Moving the front element of a Tessar by a small amount will have an impact on spherical aberration... Which I am assuming "diffusion" = soft focus = spherical aberration.
Or, given that this is LF we're talking about, move the front element in/out to your desired level of softness, then focus by moving the standards as per normal (as long as you don't make it so soft that you can't see well enough to focus it).
The adjustable diffusion is one of the more interesting features of the Velostigmat Series II, and one that sets it apart from the many other Tessar lenses available. The adjustment was a rotating front ring that allowed the front element to be unscrewed one rotation, giving it slightly more distance from the other elements. There is some confusion as to how it should be used, but the 1916 Wollensak Lenses and Shutters Catalog explains:
“The amount of diffusion is variable at will and so places in the hands of anyone artistically inclined, a powerful means of expressing their individuality. It is by no means difficult to manipulate this attachment, by turning the front mount around to the marks 1, 2, 3, 4, or 5, as desired, then focus. When the indicator is set at 0, the lens is ready for general work, producing negatives with snap and life; set at 1, you have a slight diffusion, at 2, a greater degree of diffusion, and so on, the higher the number, the greater the diffusion.”
In actual use, very little diffusion is evident, even at setting 5. This has led some to try focusing at the 0 (sharp) setting, then dialing in the softness. The rotation, however, causes the focal length to shorten slightly, so the focus-then-adjust method results in an out-of-focus rather than soft-focus image. But the Wollensak catalog makes it clear, set the diffusion, then focus. So what is the “artistically inclined” photographer to do?
There is a “cheat” possible that allows one to adjust the diffusion far past the factory limited setting of 5, to a setting that would be (by counting the rotations) of 40 or so. At that setting, the Velostigmat Series II has an obvious and (at least in my eyes) lovely soft-focus signature. (...)
So what do you think? Is it possible to make ultra light but wide coverage contact lenses that are also ultra sharp in those extreme formats?
It has been done. Go here: http://cnum.cnam.fr/CGI/redir.cgi?M11121 , click on Exports, click on PDF, go to p. 43. For another example, http://books.google.com/books?id=cnkWAAAAYAAJ&dq=zeiss+unar&source=gbs_navlinks_s Click on the little starry wheel in the upper right corner of the screen to download as a PDF. See pp. 68-9 Page numbers refer to pages in the PDFs, not to page numbers in the documents themselves.
Quite long focal lengths are cataloged. How many of them were made is an interesting question. Used long ones come to market rarely and command high prices.
I'm puzzled by what contact lens means in this context. Did you mean compact?
And what exactly do you mean by ultrasharp? I ask because discussions with ULFers about what coverage means makes it clear that many, not all, of them contact print. Contact printing demands less sharp negatives than enlargement does.
I'm sure it's entirely possible. I'll add it to the list.
One thing I have to ask is that you define "lightweight".
For me at work, that means a few ounces. For the 165 mm It's looking to be less than a pound total. For someone else it may be 5 lbs. So feed the designer numbers. Realistic numbers of course.
And yes I will cross-link. Hoping to start that thread tonight.
Sorry, yes, that means Compact, not contact...
I understand that many of them contact Sprint and sharpness is not as valuable, but still if you're using one lens for multiple formats for example, I may use that "900mm C" lens on my 8x10 with a 4x5 reducing back (as an example only) shooting .... I don't know the moon or Empire State Building from Brooklyn. I might also want to use that to make a 16x20 image on a 16x20 camera of a landscape, or even the entire city skyline, but wall enlarge it for a mural. The edges also need to be sharp, as does the center for the greater enlarging of 4x5.
One such photographer that recently has been looking for something similar to the 550mm (something) hard to find lens that covers 16x20 but wants ultra sharp edges personally for his work is Dan (Kodachrome) and is just one example of a photographer who is unhappy with anything that is actually attainable and available at a reasonable price for ULF images.
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