Just saw a Radar Anastigmat 12" F6.3.
It is mounted in an Ilex #5.
Huge lens. It appears that at some point the front rim of the lens which carries the name and SN, had the original Max F stop marking rooted out, and instead the "6.3" stamped in the cavity.
Google does not know about a Radar 12" 6.3 - can anyone point to a camera centric page that covers this? Or perhaps otherwise direct to info?
Is it possible this is in fact a 4.5? If so, what would be a simple way to test this?
Originally Posted by koh303
Dont see any reference to 6.3 on that page...
An image would help, but usually a 12" Tessar-type lens fit in a #5 shutter is a f4.5 lens (eg; The 12" f4.5 Ektar). A 12" lens fit in a #4 shutter is a f6.3 lens (eg; The 12" f6.3 Commercial Ektar). A #5 shutter marked at f6.3 is possibly from a 14" lens (eg; The 14" f6.3 Ektar). So, perhaps someone put a 12" f4.5 Radar into a shutter for a 14" f6.3 lens?
Gundlach Radar? Mine was a 12" f4.5.
Measure the aperture through the front element. An f/4.5 will be around 2.7 inches, an f/6.3 around 1.9 inches.
"I love my Verito lens, but I always have to sharpen everything in Photoshop..."
It is 2.7".
This brings up the question of why the lens is so marked - is it because of the available shutter markings? It seems that i would be the same trouble to re etch the lens as it would the shutter...???
I'd guess that Jason is right, that shutter was originally for another f/6.3 lens, likely a 14-inch like a Commercial Ektar or Caltar. But re-labeling an f/4.5 lens as an f/6.3 doesn't make it one. Used with those markings, all the exposures would be one stop over. (Personally, I would have re-engraved it as a Dallmeyer 4B...)
"I love my Verito lens, but I always have to sharpen everything in Photoshop..."
Weird. An Ilex #5 has a 63mm maximum iris. Other 12" Radars mounted in #5 Alphax shutters have f/4.5 apertures and the Alphax has a 58mm maximum iris. Your should be f/4.5 despite the wonky marking.
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