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 

Graphic 23 Back on 2 x 3 Crown Graphic?

 
Post new topic   Reply to topic    Graflex.org Forum Index -> Film Help
View previous topic :: View next topic  
Author Message
Negative Energy



Joined: 14 Sep 2005
Posts: 17
Location: Philadelphia

PostPosted: Tue May 01, 2007 1:15 am    Post subject: Reply with quote

I recently picked up a 2 x 3 Pacemaker Crown Graphic and also a Graphic 23 back. I shot one roll and everything was out of focus, even the shots I did in the studio only using the ground glass to focus. It looks like the rangefinder and groundglass are in sync and focusing correctly. I suspect the bugbear is the distance to the film plane on the roll holder. Is this the wrong one? I checked the depth to the ground glass versus the film holder and the ground glass is almost twice as far back.
Back to top
View user's profile Send private message Send e-mail Visit poster's website
45PSS



Joined: 28 Sep 2001
Posts: 3207
Location: Mid Peninsula, Ca.

PostPosted: Tue May 01, 2007 7:59 am    Post subject: Reply with quote

Quote:
I recently picked up a 2 x 3 Pacemaker Crown Graphic and also a Graphic 23 back. I shot one roll and everything was out of focus, even the shots I did in the studio only using the ground glass to focus. It looks like the rangefinder and groundglass are in sync and focusing correctly. I suspect the bugbear is the distance to the film plane on the roll holder. Is this the wrong one? I checked the depth to the ground glass versus the film holder and the ground glass is almost twice as far back.

I assume that the camera has a graflok back. Is the ektalite screen (fresnel) is in place? Focus should be approximately the ground edge of the ground glass, which you will have to approximate with the ektalite screen in place. The ground glass could have been shimed back futher by someone else for a special purpose or film back that they were using.
The Top RF Pacemaker service manual at http://www.southbristolviews.com/ covers all sizes of pacemakers and the only difference between the side and top RF is the Rangefinder.
_________________
The best camera ever made is the one that YOU enjoy using and produces the image quality that satifies YOU.
Back to top
View user's profile Send private message Visit poster's website
Dan Fromm



Joined: 14 May 2001
Posts: 1883
Location: New Jersey

PostPosted: Tue May 01, 2007 10:07 am    Post subject: Reply with quote

The roll holder should be on spec. Three possibilities:

Graflok focusing panel set up for a fresnel, fresnel missing. If there's no fresnel, the bosses the GG sits on should be, um, high.

Graflok focusing panel not set up for a fresnel, fresnel there anyway. If there is a fresnel, the bosses it sits on (the fresnel goes in front of the GG), the bosses it sits on should be, um, low.

All correct BUT GG in backwards OR GG in front of fresnel. The ground side of the the GG should face the lens. The fresnel, if present, should be in front of the GG and the grooved side should face the GG.

There's just one focusing panel casting, so casting number won't help you decide whether yours has high or low bosses.
Back to top
View user's profile Send private message
Negative Energy



Joined: 14 Sep 2005
Posts: 17
Location: Philadelphia

PostPosted: Mon May 28, 2007 2:42 pm    Post subject: Ground Glass Whackiness: Reply with quote

Dann appears to be right, but I'm not sure exactly how to interpret what he wrote. It's clear someone took it apart (not me!).

It looks like this is the current configuration; there are two elements, a conventional ground glass and a fresnel lens to make the image brighter.

Here is the order of the surfaces if you start from the "inside the camera" side and work your way back to the side you see when you pop open the viewing hood.

1. Fresnel
Side facing lens: ridged
Side facing viewing hood: smooth

2. Groundglass
Side facing lens: smooth
Side facing viewing hood (outermost surface) opaque

I'm sure this is wrong.

Correct order?

Thanks!

RA Friedman
http://rafriedman.com
Back to top
View user's profile Send private message Send e-mail Visit poster's website
troublemaker



Joined: 24 Nov 2003
Posts: 715
Location: So Cal

PostPosted: Mon May 28, 2007 3:34 pm    Post subject: Reply with quote

Ground side of glass faces lens, clear side faces hood or back.
Clear smooth side of freznel faces lens, ribbed side faces ground side of glass.

Freznel goes down first into panel and then GG as above.

Also, lookin thepanel and see if the bosses havebeen milled so the panel will properly accept the added depth of the fresnel. I think the fold up hood will not fit very well if not milled. May be a clue. Someone may have tried to drop one in, or according to your list of sequence, took everything out and improperly reassembled. While you've got it apart, clean with windex and soft cloth.
Back to top
View user's profile Send private message
Dan Fromm



Joined: 14 May 2001
Posts: 1883
Location: New Jersey

PostPosted: Tue May 29, 2007 9:52 am    Post subject: Reply with quote

Hmm. Yes, the fresnel goes in front of (lens side, not film side) of the GG. But the ground side of the GG should face the lens, not the film.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Graflex.org Forum Index -> Film 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