Go Back   Rangefinderforum.com > Cameras / Gear / Photography > Leicas and other Leica Mount Cameras > Canon Leica Screw Mount Film Rangefinders

Canon Leica Screw Mount Film Rangefinders For classic Leica Screw Mount Canon Rangefinders.

Reply
 
Thread Tools Search this Thread Display Modes

RF calibration
Old 08-03-2006   #1
rogue_designer
Reciprocity Failure
 
rogue_designer's Avatar
 
rogue_designer is offline
Join Date: Jun 2006
Location: Atlanta, GA
Age: 44
Posts: 2,489
RF calibration

I have a Canon P that took a short fall, and I think got knocked a bit out of alignment. No other damage luckily.

I know where the adjustment screws are... what I don't know (and don't laugh) is how I know when it's back in alignment. What am I looking for - and how do I test as I go. Is there an easy way, or do I need to make a makeshift optical bench and target? And run test rolls to see how it's coming along?

*feeling really stupid... I would usually send out, but if it's an easy process, I'd like to know.
__________________
Si hoc legere scis nimium eruditionis habes.
Usually using: Rolleiflex 3.5E, Fuji X Pro 1/X100S, Horseman VHR, Horseman 45LX

---
My Flickr | StreetLevel Photography
  Reply With Quote

Rangefinder calibration
Old 08-03-2006   #2
airds
Registered User
 
airds's Avatar
 
airds is offline
Join Date: Feb 2005
Location: Oban, Scotland
Posts: 388
Rangefinder calibration

The info under the Canon P section of Karen Nakamura's website should help - approx halfway down
  Reply With Quote

Old 08-03-2006   #3
Reprosteve
Steven
 
Reprosteve is offline
Join Date: Jun 2006
Location: Randolph,Ma.
Posts: 8
Talking to my camera repair person,you align the rangefinder at
infinity.Once that is done ,and nothing is Stuck(your rangfinder)everything
should fall in place.There is only one adjustment.

An example.If you have a 70-200mm zoom lens.If you focus in manual on a subject at 200mm, when you zoom back to 70mm theoreticaly everything should be in focus.It's the same pricipal as
adjusting the rangefinder
  Reply With Quote

Old 08-03-2006   #4
John Shriver
Registered User
 
John Shriver is offline
Join Date: Jan 2005
Location: Arlington, MA, USA
Posts: 1,226
There are other adjustments, but they're not likely to be messed up by dropping the camera. The effective length of the cam follower arm is adjustable in some way, either by bending it, or by the roller being mounted on an eccentric stud. This adjusts the "rate" of the rangefinder. (Consider the infinity setting the "zero intercept", and the arm length the "slope".)
  Reply With Quote

Old 08-03-2006   #5
rogue_designer
Reciprocity Failure
 
rogue_designer's Avatar
 
rogue_designer is offline
Join Date: Jun 2006
Location: Atlanta, GA
Age: 44
Posts: 2,489
Quote:
Originally Posted by John Shriver
There are other adjustments, but they're not likely to be messed up by dropping the camera. The effective length of the cam follower arm is adjustable in some way, either by bending it, or by the roller being mounted on an eccentric stud. This adjusts the "rate" of the rangefinder. (Consider the infinity setting the "zero intercept", and the arm length the "slope".)
I think I see...

Can I set it via the viewfinder and lens distance setting only then, and not have to worry about the ground glass/tape along the film rails stuff?

Do I gain anything by doing an optical set up with ground glass at a closer distance?
__________________
Si hoc legere scis nimium eruditionis habes.
Usually using: Rolleiflex 3.5E, Fuji X Pro 1/X100S, Horseman VHR, Horseman 45LX

---
My Flickr | StreetLevel Photography
  Reply With Quote

Old 08-04-2006   #6
venchka
Registered User
 
venchka's Avatar
 
venchka is offline
Join Date: Apr 2006
Age: 73
Posts: 6,212
Quote:
Originally Posted by rogue_designer
I think I see...

Can I set it via the viewfinder and lens distance setting only then, and not have to worry about the ground glass/tape along the film rails stuff?

Do I gain anything by doing an optical set up with ground glass at a closer distance?
I bounced my IV-S? off the marble floor of the Heidelberg train staion one might running to catch the last train back to Worms. The top plate got a nasty ding and the rangefinder was knocked out of alignment. Not having a clue as to how to fix it, I bought an auxilliary rangefinder. I got brave one day and removed the top cover. Found the adjustment screw. I put the camera and 50mm lens on a tripod. Set the lens at infinity. Pointed the rangefinder at a light pole about 100+ yards away. Turned the screw until things were lined up. Worked like a charm. I still have the rangefinder. I sold the camera and lens.
__________________
Wayne
Deep in the darkest heart of the East Texas Rain forest.
Quote:
"Leave me alone, I know what I'm doing" Kimi Raikkonen
My Gallery
My Blog-Reborn
FlickrMyBookTwitSpaceFace

Last edited by venchka : 08-05-2006 at 16:56.
  Reply With Quote

Old 08-04-2006   #7
AndersG
Registered User
 
AndersG's Avatar
 
AndersG is offline
Join Date: Dec 2004
Location: Göteborg, Sweden
Age: 41
Posts: 252
Quote:
Originally Posted by John Shriver
There are other adjustments, but they're not likely to be messed up by dropping the camera. The effective length of the cam follower arm is adjustable in some way, either by bending it, or by the roller being mounted on an eccentric stud. This adjusts the "rate" of the rangefinder. (Consider the infinity setting the "zero intercept", and the arm length the "slope".)
[Sorry, this is a bit off topic]

On the Canon 7 the cam follower roller is mounted on an eccentric stud and I think it might be the same on the P. Do you or anyone here know where I could find the sort of tool needed for changing this adjustment?
I did mess with this adjustment on my 7 and discovered that using a screwdriver it can be adjusted in one direction only - and that was the wrong one...

(The Canon 7 service manual identifies the proper Canon tool as a T06A-C151-747A/B, but that doesn't help finding the right equivalent tool.. It ought to be some kind of very thin spanner.)

/Anders
__________________
My Gallery

Last edited by AndersG : 08-04-2006 at 07:57.
  Reply With Quote

Old 08-06-2006   #8
John Shriver
Registered User
 
John Shriver is offline
Join Date: Jan 2005
Location: Arlington, MA, USA
Posts: 1,226
The "try this at home" RF adjustment is to mount a known good lens on the camera, focus it at infinity, and then get the RF image to align when looking at something at least 1/4 mile away. The more "official" thing is to use a special jig "lens" that is machined from a billet of metal, and has exactly the right 7.5mm cam projection. (Canon used to make one.) But a normal lens in good condition should be fine. (Just don't use an Elmar with a worn focusing helical!)

As for the eccentric cam follower on the Canon 7, make your own tool. Tomosy's approach is to make a custom wrench from a peice of hacksaw blade, using a Dremel (TM) tool and a cutoff disk. Any sort of spring steel would actually be suitable, but a hacksaw blade is very easy to source.
  Reply With Quote

Old 08-06-2006   #9
rogue_designer
Reciprocity Failure
 
rogue_designer's Avatar
 
rogue_designer is offline
Join Date: Jun 2006
Location: Atlanta, GA
Age: 44
Posts: 2,489
Thanks for all the help gents! Worked a treat, and the P is sharper than ever.

I put on the old 50/1.8 that was so sharp before and used the infinity method (focus on the moon) and got that as close as I could. Then checked the results at closer range using a tripod, a point light source a meter away, and a bit of groundglass on the rails. Image was perfect, and on checking new negs tonight, all seems to be well again.

Much obliged to this forum. What a great resource you all are.

Cheers,
Liam
__________________
Si hoc legere scis nimium eruditionis habes.
Usually using: Rolleiflex 3.5E, Fuji X Pro 1/X100S, Horseman VHR, Horseman 45LX

---
My Flickr | StreetLevel Photography
  Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Photo Mythbusters - Does R-D 1 RF patch move in the frame? jlw Epson R-D1 Leica M mount Digital Rangefinder 6 08-08-2006 05:39
WTSee: image of Hexar RF inside Kameraleder case akptc Konica RF / Zeiss Ikon ZM Leica Mount Rangefinders 2 07-28-2006 21:03
amusing SLR versus RF issue mdelevie 120 / 220 film RF's 8 07-27-2006 20:04
Fast or compact lenses, the RF way fitzihardwurshd Rangefinder Photography Discussion 56 07-07-2006 10:03
Is this due to RF misalignment? ent2b Voigtlander Bessa Leica Mount Cameras 5 07-01-2006 01:53



All times are GMT -8. The time now is 15:43.


vBulletin skin developed by: eXtremepixels
Powered by vBulletin® Version 3.6.8
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.

All content on this site is Copyright Protected and owned by its respective owner. You may link to content on this site but you may not reproduce any of it in whole or part without written consent from its owner.