Thanks to all for help in its indentification!
But what about "Dallmeyer Finder Anastigmat"? I have found nothing in Google apart from a few photos taken with it with its unusual/amazing rendering (some of the last at the site):
http://jorson.dyndns.org/ognn/viewth...id=37&page=164
The 5" f4 Ross WA Xpres was designed for 5x4 and 5x5 (aerial film format), it doesn't cover 5x7 and has an angle of view of 70º, at one time Ross claimed it would cover 6½x4¾ with an Angle of view of 80º but they later reduced this.
The AM military version was an aerial camera lens optimised for Infinity, unlike the standard Xpres WA it was restricted to f4-f11 rather than the f4-f32 of the regular version, Ross subcontracted some of the AM lenses so although based on a Ross design it may have been made elsewhere. The quality of some of the AM lenses isn't always as high as the regular production lenses.
Ian
A.M. lens serial numbers starting with UU or WW are Dallmayer, WW are Ross AFAIK.
http://www.jeffbridges.com/perception.html "Whether you think you can, or think you can't, you are right."
I saw someone say they used a Dallmeyer Aerial lens recently - bought it in the UK for apparently 70 GBP - I was quite surprised to see a dallmeyer being so cheap - I thought they were all expensive!
So I suppose there were a lot of aerial lenses as well?
I sold an old brass Dallmeyer 1aa, for less than that not long ago, but yes, unless they had something that made them special, a lot of A.M. lenses, no matter who made them, as well as many aerial Dallmeyers go cheap these days (and rightly so).
http://www.jeffbridges.com/perception.html "Whether you think you can, or think you can't, you are right."
Ian The lenses were used on Torpedo cameras which took four 6cm x 18cm photographs on 120 roll film. 18cm is a smidge over 7 inches. Stopped down past the marked f11 they will cover 5x7.
Roger, sqrt(60^2 + 180^2) = 190. The diagonal of 5x7 is 210 mm. Are you sure that the 5"/4 Ross will cover 5x7?
FWIW, I had one of those beasties years ago. I bought from Surplus Shed, who offered it as an enlarging lens. I shot it for trial on a Nikon since only central sharpness mattered for my application. Very sharp, even wide open, also very flary.
Roger, the image circle required for 6x18 is less than for 7x5 (as Dan points out), but it's only slightly larger than the 5x5 format Ross claim the lens covers at full aperture. One feature of the lens is it's sharpness at wide apertures.
Ian
Just to be precise - the Torpedo camera back makes negatives of full 186 mm length.
My apologies to you all. Firstly for the tardiness of my reply. I have been engaged organising care for my Mum who came out of hospital yesterday and also for misleading you. The lens used on the torpedo cameras whilst made by Ross and having a focal length of 5" was of a different design and had an f4.5 maximum aperture. Thank you Ian and Dan.
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