TT&H Cooke lens

[IanG]

If I was a betting man I'd say that wasn't a triplet and put my money on it, the rear element cell of Triplets are usually much smaller. Also it is a Series II Cooke Anastigmat.

Ian

[seawolf66]

One there is not a shutter only iris in brass and glass lenses, if you look at the fourth photo it shows the barrel without rear lens

PS The whole back may screw out of the shutter, not just the glass. You don't need to take out the retaining ring holding the glass in the brass sleeve cell. ( if I have interpreted your scratch comment correctly)

[seawolf66]

ok with Iris shut down to F-16 I get four reflections. as for the two series two from Cooke the second on page 23 is a portrait lens so they say , because it starts with a 10 1/2inch lens and goes to 18inch lens
which is what they call their series II portrait lens. On page 11 of the same booklet they state their series II is a fast lens and that one starts at F-4 1/4 inches going to 8 inches
that's the only difference I can find between them two :

Cooke nomenclature seems very confusing with two series ll lenses at the same time.
I have an 10.4 inch Series ll anastigmat which is a triplet.
If you close the aperture down and look at the back with a ceiling light above you, you will see either two reflections of the light (triplet) or 4 reflections (Aviar).
I am sure others will chime in with a more refined technique.
It does look like there are two cells on the back

[cowanw]

Four reflections is an Aviar. There will be four on the other side of the iris as well.
Have a look at this site.
http://www.cookeoptics.com/cooke.nsf...amera2002.html
About a third of the way down you will see the part on the Aviar describing the
"The Cooke Aviar Series II f/4.5 ... lenses are of what lens designers call the dialyte type of lens construction. This consists of two air-spaced achromatic doublets, the two outer ones double convex, and the two inner ones double concave."

[IanG]

The Cooke website is a little wooly on dates. They mention the new range of Series II Aviars as being 1924 on one page and 1921 on another, the BJP Almanac Cooke adverty for 1921 lists the Aviars. There was an earlier Series II Cooke same f4.5 aperture and focal lenghts as well.

Nice lens Lauren

Ian

[Steven Tribe]

This is not a hijack!
I was cleaning a aviar 6 5/8" for listing when I realised this was a slowed down version F6.3.
It is a dialyt design.
I can only find this type post WW2 and coated? serial number is 112080.
Have I missed something in VM?

[IanG]

Your 6 5/8" f6.3 Series IIIb Aviar lens is listed in the BJP Almanac 1927 TTH Adverts, want me to scan the page ?

Too late the scanner was next to me so I've done it



It appears from a 1951 advert that both series of Aviars were improved and passed a series of Government tests with regards to their sharpness and definition. I'm sure I've something about this and their coatings in a post WWII BJP Almanac.

Ian

[cowanw]

way cool

[Steven Tribe]

Thanks Ian!
I found the Aviaric in VM but was puzzled by the clearly engraved Aviar designation.
It is very well put together for a mass produced item.

[IanG]

Thanks Ian!
I found the Aviaric in VM but was puzzled by the clearly engraved Aviar designation.
It is very well put together for a mass produced item.

If people called the lenses of any make by their order codes it'd be a nightmare Meyer lenses of about the same era had a different order code depending on which FL as well as shutter.

TTH never made an Aviaric.

Ian