Canon LTM A puzzlement - Help please

Canon M39 M39 screw mount bodies/lenses
S

Stanton

Guest
I loaded a roll of Fuji Superia ISO 400 print film into my faithful Minolta SRT 101 and took about 9 photos. I then received my new (to me) Canon 7. I dry fired it a number of times, check the light seals which seemed to be satisfactory I decided to finish the Minolta roll in the Canon as a test. I carefully rewond the film in the Minolta leaving the tongue out. I loaded the roll into the Canon. I when into a very dark room, and at 1000, f22, lens cap on, fired off 14 or so shots. There is a clear space on the film indicating that this did not expose the roll. I then took a series of shots with the Canon and took the roll in for processing.

When the film was returned, SOME, but not all, of the negatives from BOTH cameras, there are a series of wavy horizontal lines, about 2mm thick, whitish, but not solid in color. All of the negatives, both without the lines and with the lines from both of the cameras appear to be propertly exposed.

The processor says she doesn't think it is her machine (a Fuji processor) becasue she noticed the issue on my roll and checked the rolls before and after mine, all of which were fine.

This doesn't look like light leaks to me. If the trouble were with one camera, especially the Canon, I could understand that it is likely a camera problem. If all of the negatives were affected, I could say bad film or development. But it affects just some negatives on both. That is to say, I have good negatives without the lines from both cameras. Bad film (I have never had a defective roll in probably 50 plus years of photography)?

Any ideas?

Dave
 
Are the lines lengthwise with the film strip? Do any of the non-exposed (i.e. middle portion) of the film strip have these lines?

The easiest way to verify both cameras is just to get two rolls of the cheapest color print film you can get, and expose each roll through its respective camera, and get them processed. These don't have to be award winning shots, just any old normal exposure to verify the integrity of both cameras.

~Joe
 
Inspect the emulsion for light scrapes and the pressure plate of the Canon 7, and the rest of the film compartment. Look for burrs or anything else that could damage the film as it is advanced. I've had this happen on a couple of cameras, and cleaned/filed down the offending spot.

Just a thought.
 
If you do the test with the cheap film take a picture of yourself in the mirror to confirm which camera the film is from...just another thought...
 
Thanks for all the help, fellers.

I don't think it is scratches. First, if the cannister felt or the inside of the cameras had a burr, the lines would tend to be sharp and straight. They are wavy and fuzzy edged. Second, I carefully inspected teh emulsion side of the film and even under magnifcation could not find any scratches which remotely resembled the wavy lines. A scratch which caused a 2mm or so line should be visible. On the non-emulsion side there are a couple of fine, sharp parallel scratches running lengthwise, But they do not remotely correspond the wavy lines.

I think it has to be either the film or the development.

I will run separate rolls of Kodak through each of the cameras to see what happens. I think I will also contact Fuji and see if Fuji has any thoughts.

Again, thanks -- I really appreciate the help.

Dave
 
I'd vote for processing. The Fuji machines are roller transport systems and film dragging through a set of rollers will exhibit wavy scratches. I used to run a color lab in the early 80's and we used 11" RT machines doing 6 rolls of 35mm across. Slipping gears, the tape from the end of a roll (if the tech didn't remove as it should have been), or a piece of film from a damaged roll (people often ripped film off the cassette spool) would jam the transport briefly and scratch the film. The Fuji machines can two rolls side by side.

You may not see the damage again.
 
Just to "close the loop," I loaded the Canon 7 with Kodak film today and shot a roll. (I have a lot of Fuji on hand and wanted to be certain I was using a different batch.) When it was developed, same processor and machine, no scratches, no wavy lines, no light leaks, good exposure. I am compelled to think it was the processing.

I have not retested the Minolta at this point because it has been faithful for some time. The Canon was new to me.

I e-mailed Fuji regarding the problem. Almost instanteously I had a reply, "We are sending you a postage paid mailer so that you can send us the film for analysis." That's real cusomer service and I am impressed!!

Dave
 
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