Gundlach Radar 8x10 Ext. W.A. Anastigmat f16

[ImSoNegative]

then there must be a third one, mine has a 7 on the back of it, i looked closely to see if there was a 1/2 that maybe got rubbed off but all it has is a 7 in quotation marks. interesting.

[cyberjunkie]

then there must be a third one, mine has a 7 on the back of it, i looked closely to see if there was a 1/2 that maybe got rubbed off but all it has is a 7 in quotation marks. interesting.

I got mine.
It's exactly the same you own. It's a 7 inches.
Everything semm to confirm that a lens with the same name was made in at least three different focals: 6 1/4", 7" and 7 1/2". I doubt that they were made at the same time.
I wonder if the optical prescription was changed at some time, or if the basic design was kept the same for all versions.
In my example each cell shows two very close big reflections, and two very weak ones (one is so small and weak that's quite difficult to see).
That would make three cemented elements on each cel. The two cells are NOT symmetrical, the front element has a much smaller diameter than the back one.

Any further observation is more than welcome.
I will put the lens in shutter very soon, and i'll see how it performs (i am a little concerned about focusing, it's my slowest lens!).
I would be happy to date the lens, the serial is 2110xx

have fun

CJ