Angulon as a triple convertible lens - anyone tried it? :)

eumenius · Sep 30, 2007

Hello friends,

does anyone have an experience of using the Schneider Angulon 90/6.8 or 65/6.8 as a convertible lens, with one or another elements removed? As I can see, the Angulon's scheme is much like the one of reversed Dagor (ortho-protar), so both cells should have been corrected well (being of a different focal length like f:2 and f:1.5, I assume). So it should work fine, stopped down a bit - and the f/stops can be calculated easily from the practically found focal distance and the entrance pupil diameter equal to the used element diameter, right? Can't see much use for such a slow lens, but maybe there were some exploits in this field?

Cheers from Moscow,
Zhenya

Ole · Sep 30, 2007

I haven't tried it, but the Angulon was marketed as triple convertible in the 1930s. Somewhere I have seen a list of the focal lengths, but your assumption of 1.5x and 2x is correct unless I'm very much mistaken.

Check here: http://www.cameraeccentric.com/html/info/schneidera/schneidera.html

Jim Noel · Sep 30, 2007

The Angulon is convertible. but not a triple convertible. I occasionally remove the front element snd ude the rear. It must be used at small effective apertures to have reasonable sharpness. It is not as sharp as the original lens.

GeorgesGiralt · Oct 1, 2007

Zhenya,
With my 1950 90 mm vintage Angulon, removing the front cell gives a 150 mm focal lens lens. It is really soft, at f:6.8 (I can't tell the actual F-stop with the rear cell alone) and do not get better when stopping down.
Removing the rear cell is quite difficult in the field because the cell does not protude and need a wrench to be removed. So you will have only two focal lens availlable with this Schneider lens.
IMHO, getting a 150 mm so soft is of very limited use as the standard lens can be get cheap second hand and will prove better than the convertible whatever brand/model you get. It would also be faster.

Samuel Hotton · Oct 1, 2007

Greetings Zhenya,
I have experience with this lens as a triple convert. Heres the specs:
At 90mm, ALL elements together. - coverage f 6.8 3 1/4"x4 1/4"
f 11 4"x5"
f 22 4 3/4"x6 1/2"
FRONT ELEMENT, Suitable for PORTRAITS, ADD exposure factor 4X, focal length is 185mm, coverage 4" x 5".
REAR ELEMENT, Suitable for GROUPS,LANDSCAPES, ADD exposure factor 2X, focal length is 140mm, coverage is 4" x 5".

Lens is usually mounted in a size 0 shutter.

I used to use this lens during the 1970s. Mostly for prints no larger than 8"x 10". OR about 2 1/2 time enlargement. It has a very nice look.
I now use the 120mm Angulon convertable with the 185mm rear element and 250mm front element, and really like it.
Hope this helps

eumenius · Oct 1, 2007

Georges,

removing a rear cell would be quite impractical, I agree - but maybe the dim and not too sharp lens would be able to deliver something interesting in pictorial terms? Of course, I have a couple of "real" 150s, including two convertible Symmars, so the Angulon is just a potential fun, not much more.

GeorgesGiralt said:
Zhenya,

With my 1950 90 mm vintage Angulon, removing the front cell gives a 150 mm focal lens lens. It is really soft, at f:6.8 (I can't tell the actual F-stop with the rear cell alone) and do not get better when stopping down.
Removing the rear cell is quite difficult in the field because the cell does not protude and need a wrench to be removed. So you will have only two focal lens availlable with this Schneider lens.
IMHO, getting a 150 mm so soft is of very limited use as the standard lens can be get cheap second hand and will prove better than the convertible whatever brand/model you get. It would also be faster.

eumenius · Oct 1, 2007

Greetings Samuel,

thank you for sharing a great knowledge! I knew that someone would be using this tiny lens that way, too I am very pleased with the 90 Angulon (I have actually two of these - one recent, and one pre-war made), and I am also hoping to find a 120 one day, too - the very quality of picture it gives on a ground glass is outstanding, and the movements are also okay for me - if I need more, I have got 90/6.8 Grandagon-N

I would give the convertible setup a try soon

Cheers from Moscow,
Zhenya

Samuel Hotton said:
Greetings Zhenya,
I have experience with this lens as a triple convert. Heres the specs:
At 90mm, ALL elements together. - coverage f 6.8 3 1/4"x4 1/4"
f 11 4"x5"
f 22 4 3/4"x6 1/2"
FRONT ELEMENT, Suitable for PORTRAITS, ADD exposure factor 4X, focal length is 185mm, coverage 4" x 5".
REAR ELEMENT, Suitable for GROUPS,LANDSCAPES, ADD exposure factor 2X, focal length is 140mm, coverage is 4" x 5".

Lens is usually mounted in a size 0 shutter.

I used to use this lens during the 1970s. Mostly for prints no larger than 8"x 10". OR about 2 1/2 time enlargement. It has a very nice look.
I now use the 120mm Angulon convertable with the 185mm rear element and 250mm front element, and really like it.
Hope this helps

GeorgesGiralt · Oct 2, 2007

Zhenya,
This tiny rear cell is (in my Angulon) difficult to remove and so tiny it is difficult to handle in the field with my quite big hands... So I refrain to remove it.
But, yes, you may like the pictorial results you get from this little gem !

Angulon as a triple convertible lens - anyone tried it? :)

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