300mm lens comparison on x-ray film

[Ian Grant]

I agree, very odd indeed. The coating on my 300/4.5 Xenar looks factory fresh.

Ian, please share some pictures made with your version of this same lens. Let’s see the results you’ve got. Thanks.

I will, maybe a landscape, though.

Ian

 

[Ian Grant]

According to Hartmut Thiele's _Großes Fabikationsbuch Schneider-Kreuznach Band II_, 300 mm Xenar s/n 4445979 is one of a batch of 19 with a date of 7 November 1955.

Wanting to get some sense of when Schneider stopped marking their coated lenses with a red triangle I took a look at today's ebay listings of the Angulon (because there are always a lot of this particular Schneider lens on ebay.)
The highest serial number with the triangle was 4352603; its batch of 240 is dated 5 September 1955. The lowest serial number without the red triangle is 4475083, one of a batch of 203 with a build date of 1 December 1955.

So I think we can say this 300 mm Xenar is coated and made right around the time that Schneider stopped marking coated lenses with a red triangle.

David

Well you didn't spot the White Triangle coated 90mm f6.8 Angulon, with a 1949 serial number I have an older Uncoated pre WWII 90mm Angulon.

Schneider reformulated their lenses in the very early 1950s as they switched optical glass from CZ Abbe in East Germany, to Pilkington in the UK.

Ian