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Focus Scales for 80mm & 65mm?

 
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DWAYNE



Joined: 13 Jan 2009
Posts: 4

PostPosted: Wed Jan 14, 2009 1:23 am    Post subject: Focus Scales for 80mm & 65mm? Reply with quote

My Crown Graphic (23) has a 101mm with a 30882-3 focus scale, but I would like to use 80mm & 65mm lenses with focus scales.

Does anyone know what number scales I should be looking for?
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Henry



Joined: 09 May 2001
Posts: 1442
Location: Allentown, Pennsylvania

PostPosted: Wed Jan 14, 2009 5:48 pm    Post subject: Reply with quote

This doesn't answer your question, for I don't know whether Graflex even made a focusing scale for the 65 on a 2x3, but if they did (here comes an "IMO"---feel free to disregard!) I don't think it could be relied upon to give anywhere near an accurate, satisfactory result. Focusing the 65 on the ground glass with a loupe is an exercise in frustration because the focusing scale is so short, i.e., a tiny movement of the front standard makes a huge difference in the focus shift, therefore I'm having trouble believing that such a crude device as a focusing scale, even one (if it exists) that's specified for your 65 lens and 2x3 format, would give good results. But I'm prepared to be proven wrong!
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DWAYNE



Joined: 13 Jan 2009
Posts: 4

PostPosted: Thu Jan 15, 2009 12:44 am    Post subject: Reply with quote

Henry, Thank you for your thoughts, a valid point and I agree, there is not much movement to focus the 65mm. My idea was to use the scale as a guide and use the 65mm stopped down. I would like to have 65mm and 80mm focus scales only and keep the range finder calibrated to the 101mm. Then I could use the scales with the other lenses, and stop them down enough to get more in focus. Maybe I'm crazy, but I'd like to try it out to see if I can make it work for me.
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tsgrimm



Joined: 04 Apr 2004
Posts: 158
Location: SE Michigan

PostPosted: Thu Jan 15, 2009 4:58 am    Post subject: Reply with quote

DWYNE, You might think about making your own scale for the 80mm lens.
I have a Century with the 80mm Schneider and the scale is very fine.
Sorry, but I don't want to remove the scales to look for numbers.
I "measured" the distance between the markings on the scales and I hope that they may be of some help to you.

Bed Scale
4'-6' 2mm
6' 8' 10' 15' 25' all less than 1mm
25'-50' 7.5mm
50'-100' <3mm
100'-Inf <3mm

Moving Index
Index -50' 7.5mm
50'-100' <3mm
100'-Inf <3mm


Last edited by tsgrimm on Thu Jan 15, 2009 5:07 am; edited 1 time in total
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alecj



Joined: 09 May 2001
Posts: 853
Location: Alabama

PostPosted: Thu Jan 15, 2009 5:06 am    Post subject: Reply with quote

That is indeed the correct scale for your 101mm.

Graflex made 5 different scales for 80mm lenses. The numbers range from 30882-35 through 39.

They only made one scale for the 65mm lens, 30882-27.

Hope that helps.
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DWAYNE



Joined: 13 Jan 2009
Posts: 4

PostPosted: Sat Jan 17, 2009 3:16 am    Post subject: Reply with quote

Thank you much, I will keep my eyes open for those numbers.

It's funny I have one that is close to the number that's for the 65mm, it is 30882-26, but, it's not close.

Thanks again!
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alecj



Joined: 09 May 2001
Posts: 853
Location: Alabama

PostPosted: Sat Jan 17, 2009 3:54 am    Post subject: Reply with quote

That's the longest of 4 scales for a 10mm lens.
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DWAYNE



Joined: 13 Jan 2009
Posts: 4

PostPosted: Tue Jan 20, 2009 11:28 pm    Post subject: Reply with quote

OK, so if they made 4 scales for the 100mm and 5 scales for the 80mm and only one scale for the 65mm, I may be a very old man before I find one for the 65mm.

How about a 75mm? Did they make more than one for it?
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alecj



Joined: 09 May 2001
Posts: 853
Location: Alabama

PostPosted: Wed Jan 21, 2009 3:53 am    Post subject: Reply with quote

More than one? Sorry - not even one. On the low end, there was one for 47mm, and one for 65mm. The rest were for 80 and above.
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