Go Back   Rangefinderforum.com > Cameras / Gear / Photography > Classic Film RangeFinders & Other Classics > SLRs - the unRF

SLRs - the unRF For those of you who must talk about SLRs, if only to confirm they are not RF.

Reply
 
Thread Tools Search this Thread Display Modes

A12 back - light leak or user error
Old 09-13-2019   #1
nickthetasmaniac
Registered User
 
nickthetasmaniac is offline
Join Date: Jul 2011
Posts: 1,209
A12 back - light leak or user error

G'day everyone,

I just ran a test roll through a 'new' A12 back on my SWC/M. The first 11 frames were all good, but the final one was like this... Any ideas what's going on?

User error my end?

User error with development?

The only issue I can think of with the back itself is that the spacing seems excessive compared to my other A12's. But if that's the case why would half the last frame be over-exposed? Wouldn't it just reach the end and prevent me from fully winding on the last frame?

Thanks!

Ektar100679 by Nick Clark, on Flickr

Ektar100639 by Nick Clark, on Flickr
__________________
Ricoh GRII | Pentax SV, SP-F, MX & LX | Leica M2 | Olympus Pen F + 35RD | Minolta Autocord | Hasselblad 500cm + SWC/m

Instagram @other_strange_creatures
  Reply With Quote

Old 09-13-2019   #2
charjohncarter
Registered User
 
charjohncarter's Avatar
 
charjohncarter is offline
Join Date: Dec 2006
Location: Danville, CA, USA
Posts: 8,834
I hate light leaks. They come from the most unusual places. This looks like a loading, spacing, or dark slide error. I'm not a Hassy expert, so I'll just kick this to the front as nobody responded.
  Reply With Quote

Old 09-13-2019   #3
CharlesDAMorgan
Registered User
 
CharlesDAMorgan is online now
Join Date: Apr 2018
Location: South East UK
Posts: 1,077
Dark slide error would manifest on the side, not top I would have thought. Check play there though. Same with end of reel too. Unless you were shooting on its side (unlikely!).

I wonder if it is light seals in the film back. The last frame is most vulnerable as the back is removed for final winding and film removal - the rest of the frames are protected within the back and by the camera body.
__________________
De-gassing progress:

Leica M2, Nikon D700, Bronica RF645, Leica CL, Summicron 40mm, Rolleicord Va, Hasselblad 500 CM Zeiss Planar all gone.
  Reply With Quote

Old 09-13-2019   #4
Richard G
Registered User
 
Richard G's Avatar
 
Richard G is offline
Join Date: Feb 2009
Location: 37,47 S
Posts: 5,252
If the spacing was increased you may have wound on a bit too far on the magazine insert, beyond the two arrows on the film, before inserting it into the A12 casing. That might lead to one less shot on the roll: did you get 12? Indeed it looks like maybe you just lost the last bit of the film emulsion cutting off the bottom of the last frame (which is the top of the last image). I don’t know anything about malfunctioning backs and what they produce but I agree it would be odd with a light leak to get only one frame affected. I’d say it’s just how you set up the magazine insert.
__________________
Richard
  Reply With Quote

Old 09-13-2019   #5
Richard G
Registered User
 
Richard G's Avatar
 
Richard G is offline
Join Date: Feb 2009
Location: 37,47 S
Posts: 5,252
Loading a Hasselblad seems to have only two possible errors: where you place the roll in relation to the start arrows on the film. And forgetting to wind on ten revolutions to get the emulsion to the film gate. The latter often leads to losing a frame if you’ve accidentally exposed the film paper before realising. The back now wants you to advance one frame, wasting the first frame now in the exposure position.
__________________
Richard
  Reply With Quote

Old 09-13-2019   #6
Bill Clark
Registered User
 
Bill Clark's Avatar
 
Bill Clark is offline
Join Date: Dec 2004
Location: Minnetonka, Minnesota
Age: 71
Posts: 2,558
I leave the dark slide out of the film back. Seal at max expansion.

My reasoning:

The dark slide, when installed, compresses ever so slightly the rubber gasket. At some point, the gasket gets tired, hard with age, doesn’t expand after dark slide removal, causing a light leak.

When in business, I had several Haselblad cameras and changed camera rather than film back. Another person would reload and film back doesn’t need to be removed from the camera for that to take place. The day moves too fast. I concentrated on what’s happening in front of the lens.

I’ve nrver had a light leak and never replaced any seals. Some of my cameras are from the late 1950’s - early 60’s.

Maybe I’m due for a light leak issue!
__________________
I make photographs as a return ticket to a moment otherwise gone.
  Reply With Quote

Old 09-13-2019   #7
mpaniagua
Registered User
 
mpaniagua's Avatar
 
mpaniagua is offline
Join Date: Nov 2011
Location: Tijuana, Baja California, Mexico
Age: 46
Posts: 1,099
I think it is dark slide error. Dark slide wasn't probably pushed all the way in.


Marcelo.
  Reply With Quote

Old 09-13-2019   #8
Richard G
Registered User
 
Richard G's Avatar
 
Richard G is offline
Join Date: Feb 2009
Location: 37,47 S
Posts: 5,252
If this is colour negative film then the band of white at the top of the affected image is not from a dense negative exposed to light, it's from something much denser still: black backing paper of the film roll. The short chromatic line of the last colour is also consistent with the end of the emulsion. This is not a light leak.
__________________
Richard
  Reply With Quote

Old 09-13-2019   #9
nickthetasmaniac
Registered User
 
nickthetasmaniac is offline
Join Date: Jul 2011
Posts: 1,209
Quote:
Originally Posted by Richard G View Post
If the spacing was increased you may have wound on a bit too far on the magazine insert, beyond the two arrows on the film, before inserting it into the A12 casing. That might lead to one less shot on the roll: did you get 12? Indeed it looks like maybe you just lost the last bit of the film emulsion cutting off the bottom of the last frame (which is the top of the last image). I donít know anything about malfunctioning backs and what they produce but I agree it would be odd with a light leak to get only one frame affected. Iíd say itís just how you set up the magazine insert.
I got 12 frames, and the burnt section was the last part (1/3?) of the 12th frame.

I'll try another roll and be as careful as possible loading.

Quote:
Originally Posted by mpaniagua View Post
I think it is dark slide error. Dark slide wasn't probably pushed all the way in.
I don't think it was the dark slide. First, it was definitely pushed all the way in. Second, it's across the top of the frame, not the side.
__________________
Ricoh GRII | Pentax SV, SP-F, MX & LX | Leica M2 | Olympus Pen F + 35RD | Minolta Autocord | Hasselblad 500cm + SWC/m

Instagram @other_strange_creatures
  Reply With Quote

Old 09-13-2019   #10
nickthetasmaniac
Registered User
 
nickthetasmaniac is offline
Join Date: Jul 2011
Posts: 1,209
Quote:
Originally Posted by Richard G View Post
If this is colour negative film then the band of white at the top of the affected image is not from a dense negative exposed to light, it's from something much denser still: black backing paper of the film roll. The short chromatic line of the last colour is also consistent with the end of the emulsion. This is not a light leak.
I think you might be right. I'll try another roll and see how it goes.
__________________
Ricoh GRII | Pentax SV, SP-F, MX & LX | Leica M2 | Olympus Pen F + 35RD | Minolta Autocord | Hasselblad 500cm + SWC/m

Instagram @other_strange_creatures
  Reply With Quote

Old 09-14-2019   #11
gbealnz
Registered User
 
gbealnz is offline
Join Date: Jan 2012
Location: Hamilton, New Zealand
Posts: 177
Have a decent look inside the mag as well, just in case it's s segment of backing paper.
Gary
  Reply With Quote

Old 09-14-2019   #12
Rob-F
Likes Leicas
 
Rob-F's Avatar
 
Rob-F is offline
Join Date: Mar 2007
Location: The Show Me state
Age: 78
Posts: 6,123
Quote:
Originally Posted by Richard G View Post
If the spacing was increased you may have wound on a bit too far on the magazine insert, beyond the two arrows on the film, before inserting it into the A12 casing. That might lead to one less shot on the roll: did you get 12? Indeed it looks like maybe you just lost the last bit of the film emulsion cutting off the bottom of the last frame (which is the top of the last image). I donít know anything about malfunctioning backs and what they produce but I agree it would be odd with a light leak to get only one frame affected. Iíd say itís just how you set up the magazine insert.
Quote:
Originally Posted by Richard G View Post
If this is colour negative film then the band of white at the top of the affected image is not from a dense negative exposed to light, it's from something much denser still: black backing paper of the film roll. The short chromatic line of the last colour is also consistent with the end of the emulsion. This is not a light leak.
Seems a lot depends on whether it really is at the end of the roll. If it is, I believe Richard has nailed it. Nick, is that "false chromatic line" all the way to the end of the film? I'm puzzled because that area doesn't look evenly spaced from the top of the frame in your picture. If it's the end of the film, it ought to be. Still, the wide frame spacing really does suggest you ran out of film.
__________________
May the light be with you.
  Reply With Quote

Old 09-14-2019   #13
Godfrey
somewhat colored
 
Godfrey's Avatar
 
Godfrey is offline
Join Date: Dec 2011
Location: Silly Valley, California, USA
Posts: 9,193
User error? Mechanical fault? Hard to say.

Carefully Load and expose another roll of film. See if the frame spacing is still too wide, and if the last frame is cut off again. If it is on either count, the back needs servicing.

G
  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



All times are GMT -8. The time now is 09:19.


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.