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Rick A
Argentum aevum
BTW: the big kid in my avatar is my hero, my son, who proudly serves us in the Navy. "SALUTE"
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There we go. Thanks, Rick!
- Thomas
421-915 Plate for 150mm EL-Nikkor
"...the heart and mind are the true lens of the camera".
- Yousuf Karsh
"We are what we repeatedly do. Excellence, then, is not an act, but a habit".
- Aristotle
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Rick beat me too it  . Except as I look again, I realize that you said that yours is a D2, not a D5.
So I think you need to go to the "Lens Mount" section on here instead: http://www.khbphotografix.com/omega/.../D2.htm#Mounts
Based on that, I think you need a 4 1/2" cone, and either a 42mm, 52mm or 62mm Flat Lens Disc (where the size corresponds with the size of the hole).
The link that Rick posted makes it seem most likely that the lens has a 53mm thread.
Matt
“Photography is a complex and fluid medium, and its many factors are not applied in simple sequence. Rather, the process may be likened to the art of the juggler in keeping many balls in the air at one time!”
Ansel Adams, from the introduction to The Negative - The New Ansel Adams Photography Series / Book 2
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I indeed posted the link to find the thread size.
Rick A
Argentum aevum
BTW: the big kid in my avatar is my hero, my son, who proudly serves us in the Navy. "SALUTE"
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THanks, guys. I'm going to have to check exactly what I have at home to be sure, bring out the calipers to see what the thread is.
I'll check in here tonight again.
Appreciate your time!
- Thomas
"...the heart and mind are the true lens of the camera".
- Yousuf Karsh
"We are what we repeatedly do. Excellence, then, is not an act, but a habit".
- Aristotle
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Does the lens have a locking ring? I've used a 6" lens on a D2 and 4x5 with no trouble.
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 Originally Posted by Thomas Bertilsson
...bring out the calipers to see what the thread is.
To properly identify the thread you also need to know the pitch (the distance from one crest to the next).
It's probably 0.75mm, but no guarantee.
- Leigh
“Wise men talk because they have something to say; fools, because they have to say something.” - Plato
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Originally Posted by E. von Hoegh
Does the lens have a locking ring? I've used a 6" lens on a D2 and 4x5 with no trouble.
From what I can recall, yes there is a locking ring, but I'd have to double check. If there isn't, it might get tricky to find one...
If all else fails, I can always have someone machine a piece for me, with the correct thread, and hopefully then eliminate the need for the locking ring.
Thanks for confirming that 6" on a D2 will work.
"...the heart and mind are the true lens of the camera".
- Yousuf Karsh
"We are what we repeatedly do. Excellence, then, is not an act, but a habit".
- Aristotle
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Originally Posted by Leigh B
To properly identify the thread you also need to know the pitch (the distance from one crest to the next).
It's probably 0.75mm, but no guarantee.
- Leigh
I don't know how to find out the pitch, but it might not be necessary since I believe the lens came with the locking ring. I'd have to head home and into the darkroom to find out, though... Thanks for the tip.
"...the heart and mind are the true lens of the camera".
- Yousuf Karsh
"We are what we repeatedly do. Excellence, then, is not an act, but a habit".
- Aristotle
-
OK. If you already have the ring then the pitch is irrelevant.
I checked the El-Nikkor catalog and the thread is in fact 53mm x 0.75mm. So you need a 53mm hole.
For future reference...
Pitch is normally measured with a gauge designed for the purpose. Relatively inexpensive, but not for a one-shot use.
- Leigh
Last edited by Leigh B; 08-24-2012 at 02:21 PM. Click to view previous post history.
“Wise men talk because they have something to say; fools, because they have to say something.” - Plato
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