Graflex.org Forum Index Graflex.org
Get help with your Graflex questions here
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Top rangefinder with secondary distance scale

 
Post new topic   Reply to topic    Graflex.org Forum Index -> Speed Graphic Help
View previous topic :: View next topic  
Author Message
bitbybitphoto



Joined: 24 Apr 2020
Posts: 3
Location: Texas

PostPosted: Fri May 01, 2020 8:10 pm    Post subject: Top rangefinder with secondary distance scale Reply with quote

I'm looking to get a Crown Graphic which has a top rangefinder. From what I've read here (on graflex.org), the top ones may be a little easier to use, if it in good condition, but are overall harder to work on and require custom cams if using a lens other than the one that came with the camera (in the case of the one I'm looking at a Schnieder Xenar 135mm/f4.7).

But I also read one can use a secondary distance scale on the focusing rails to compensate. This was in the Kalart rangefinder adjustment article ([url="https://graflex.org/speed-graphic/kalart-adjustment.html"]here[/url]). Which of course is not the same as the top RF. However, the principle should be the same, correct? Copy/pasting the paragraph specifically:

Leave the camera set up as is, but add a second distance scale to the focusing rail. View through the rangefinder, and read the distance on the existing scale, which corresponds to the rangefinder setting. Then, refocus until the same distance is read off on the second scale.

I realize this is a stupid question As long as the RF is accurate to that distance scale, regardless of which type of RF it is, the above trick should work correct? All I have to do is make a distance scale for the lens I want?

Or I suppose another way to look at it is it's like using an uncoupled RF where I'd match the distance read by the RF, focus using the groundglass for the same subject, and then note the position of the lens.

Right?
_________________
bitbybitphoto.com
IG: @bitbybitphoto
Back to top
View user's profile Send private message
Dan Fromm



Joined: 14 May 2001
Posts: 2057
Location: New Jersey

PostPosted: Sat May 02, 2020 1:38 pm    Post subject: Reply with quote

Close but not quite a cigar. You'll need a distance scale for lens B and also a pair of bed stops.

You could mark the bed rails to indicate where the standard should be when lens B is focused to infinity, but without stops you'll have difficulty making the standard square on the bed.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Graflex.org Forum Index -> Speed Graphic Help All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group