View Full Version : Dumb question - crown graphic 2 lenses
:o My Crown Graphic Special came with 2 lenses, a Xenar 100mm and a Xenar 135mm. There are two rear elements. One seems a bit more zoomed in. How do I know which front element goes with which rear element?
Thanks.
Brian C. Miller
5-Mar-2011, 01:05
If the lenses focus correctly, then the elements are paired correctly. If not, swap the rear elements.
You might get some interesting effects by swapping them
Well all combos seem to focus fine that is why I am confused. One set focuses closest at 5". The other combinations focus further.
Jack Dahlgren
5-Mar-2011, 08:00
5 inches is about 100mm so that would seem to correspond to the 100mm lens. The 135 should focus at a bit over 6 inches.
John Koehrer
5-Mar-2011, 10:34
25.4mm = 1"
100/25.4 = 3.93"
135/25.4 = 5.31"
at infinity
Hmmm......would the 'wrong' combo vignette incredibly bad at infinity? :D
Jack Dahlgren
19-Mar-2011, 02:06
The 100mm xenar is a lens for 6cm x 9cm format. It would vignette badly at infinity on a 4x5. If that is what you are seeing it is likely the "right" combo.
Well I had the 135mm front element on with what I had previously thought was the correct rear element. The corners on the negative are nonexistent. And the fov is much wider than I would expect the 135 to be. I can see the rails of the camera O_o. I'll get a scan up.
Disregard crappy photo:
http://img840.imageshack.us/img840/3620/img159d.jpg
I guess I wasn't at infinity either....
Dan Fromm
19-Mar-2011, 05:51
large with large, small with small
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