Odd light leak in RB67 6X4.5 film back

Larry the sailor

Member

Joined

Feb 3, 2016

Messages

333

Location

NE Oklahoma

Format

Multi Format

• Oct 23, 2016

• #1

I've got an odd light leak in my 6X4.5 back. It only shows up in "landscape" position. On this back normal is portrait and rotated is landscape. Any image taken with it in normal or portrait orientation is fine but when rotated "some" of the images have a streak from the left side of the image.
It's an original Pro back I thin with foam light seals but I can't figure out why the problem only shows up with it rotated. Any ideas?

 

MattKing

Moderator

Moderator

Joined

Apr 24, 2005

Messages

53,106

Location

Delta, BC Canada

Format

Medium Format

• Oct 23, 2016

• #2

It probably has something to do with the connection between the back and the rotating back adapter.

 

shutterfinger

Member

Joined

Feb 25, 2013

Messages

5,020

Location

San Jose, Ca.

Format

4x5 Format

• Oct 23, 2016

• #3

The light seals are likely bad. Check the rotating adapter for seals. The darkslide slot is the most common failure and the top plate around the wind lever is the second.
Post a picture of the negative as it will help.

 

OP

OP

Larry the sailor

Member

Joined

Feb 3, 2016

Messages

333

Location

NE Oklahoma

Format

Multi Format

• Oct 23, 2016

• #4

I probably ought to get a set of seals for the back but It just seems odd only in one rotation and only on this back.
Now if I can just find the link to the light seals

 

shutterfinger

Member

Joined

Feb 25, 2013

Messages

5,020

Location

San Jose, Ca.

Format

4x5 Format

• Oct 23, 2016

• #5

The image at the film plane is upside down and reversed left to right SO place the negative over the film gate with the back in correct orientation to see where the leak is. They can be a pain to solve sometimes.

 

Sirius Glass

Subscriber

Joined

Jan 18, 2007

Messages

50,389

Location

Southern California

Format

Multi Format

• Oct 23, 2016

• #6

Larry the sailor said:

I probably ought to get a set of seals for the back but It just seems odd only in one rotation and only on this back.
Now if I can just find the link to the light seals

Click to expand...

ONLY one back ==> likely light leak
ONLY one rotation ==> likely light leak

likely light leak + likely light leak ==> most likely light leak

 

paul ron

Member

Joined

Jan 22, 2004

Messages

2,706

Location

NYC

Format

Medium Format

• Oct 24, 2016

• #7

can you put up a pic of your light leak?

inspect all the seals n see if they are gummy or crmbeling?

the foam material can be bought from microtools or a very nice kit is available from jon goodman on ebay... im sure some here will post his contact info.


seals are easy to do yourself and cheap enough to justify not sending it out.