Does anyone know what formula the Aldis Anastigmat lenses actually are? I haven't been able to find any concrete info, the one I have is a triplet, but does that mean they are all triplets?
Does anyone know what formula the Aldis Anastigmat lenses actually are? I haven't been able to find any concrete info, the one I have is a triplet, but does that mean they are all triplets?
No, some are Uno types. Cemented doublet in front of the diaphragm, biconvex (and nearly flat) behind it. See Kingslake, History of the Photographic Lens, fig. 6.4
I have an f7.7 Uno, not been able to use it due to being in a broken shutter.
It's the later ones that intrigue me, 1930s and 1940s. I saw an f3.4 4 inch the other day from a 6x9 focal plane camera and there is an f8 10 inch on ebay now.
I guess the only way to really know is to examine them.
I can look in my BJPA's for you, photos would help. Their Telegraphic address was "Optical, Birmingham" but they were always a small manufacturer Houghton's used their lenses which fell between Beck/Bausch and TTH Cooke in terms of price/quality.
This may help
You should be able to find the Aldis Patents.
Ian
Thanks Ian. So Beck and B&L were the cheap stuff? I haven't got a particular lens n mind, I nearly bought that f3.4/4", but I already have more than enough 'normal' lenses for 6x9.
Just labelling everything Anastigmat is pretty unhelpful when trying to find out info such as coverage. For instanve, an f8/10" lens merely labelled Aldis Anastigmat, how to determine what format it was intended for or find out much else about it?
Depends on the exact lenses chosen by a camera manufacturer, Aldis made a range of lenses. Beck and Aldis were best known for quite pedestrian lenses but both companies tried to break out of that market, unsuccessfully, maybe because their major competitors had cornered the UK market. B&L's best lenses were made under license and they couldn't be sold in the UK (except with US made cameras) as Ross held the licenses here.Originally Posted by Ian Greenhalgh
This is where Aldis adverts can help, but they didn't advertise fully in the BJPA which is the main source in the UK.Just labelling everything Anastigmat is pretty unhelpful when trying to find out info such as coverage. For instanve, an f8/10" lens merely labelled Aldis Anastigmat, how to determine what format it was intended for or find out much else about it?
Ian
Ians, in the US B&L sold at a variety of price points.
Ian Greenhalgh, many makers used the designation anastigmat on lenses of many types. Consider the first lenses engraved Anastigmat. CZJ Anastigmats, to be exact, later renamed Protars after other makers started to use the designation anastigmat, and made under license by E. Krauss, Ross, Suter and, oh, yes, the bottom-of-the barrel B&L.
Why don't you buy all the mystery anastigmats you can afford and write an article about them? Design type, coverage (in degrees, please), how well they shoot, ... You might be able to economize by buying catalogs and then buying only the mystery lenses that aren't in them. The world's waiting, get to work!
And write an article that contains all you learn. Random posts on bulletin boards really won't do. The world wants a comprehensive article.
Thanks Ian. That f8/10" is a wartime item I think as it has a 14A/ code on it. I was intrigued because of the small max aperture as to what design it might be. I know Wray made some f8 Lustrars that were 4/3 tessar types, f8 wouldn't be unusual for a 4/4 dialyte, or it might be an updated version of the old f7.7 Uno. I doubt there's any way to find out what it is without buying it and examining it.
Most of them, perhaps? Mine is a triplet, it performs quite well, but it's a very ordinary lens and if I just want a sharp image, I have better lenses on hand.
Thanks Jody. I have a feeling most of them are triplets and nothing to write home about.
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