Question about Canon EOS Rebel Ti / 300V 35mm SLR Camera
I have had no problems since getting the camera over 10 years ago. All of a sudden though I have been getting photos with a terrible line down the centre. It shows up clear on the negative and doesn't always show up on every photo once developed. Any ideas?
This looks as if the negative has been scratched by the minilab processor. It could be scratched in tha camera but with this camera there are only two places this could happen resulting in this kind of scratch.
One is the film cassette itself, the other is the take-up spool, where the film is wound onto itself. However this would not be likley to create a scratch affecting more than one or two negs.
Colour film has a built in orange filter which compensates for the excess sensitivity of colour papers to blue. If this is scratched away, then more blue get's through which prints yellow.
The processing machine uses sqeegee's to prevent carry-over of chenicals form one bath to another, and damage or contaminaton of any one of these can scratch the negative. This is much more likely during processing, as the emulsion is softer when wet.
Films usually have a protective anti-scratch layer, but the protection is not 100%. Also develelped emulsion is generally harder than undeveloped as the last development stage often contains chemical hardeners designed to give extra protection to the negative.
The reason it may not show on all the prints is simply that these days many colour film is printed by digital scanning. Many scanners can detect scratches by viewing the negative in infrared light. Photographic dyes are transparent to infrared in order to reduce heat absorption from enlarger lamps, so there should be no image visible in infrared, anything that is must be dust or a scratch. The image can them be processed to compensate for the scrathes making them virtually undetectable.
A thin scratch may be filled in by using pixesl just either side of the scratch to fill the scratch in. With a wider scratch, if there is some residual image then the software can use that and nearby unscratched areas as a guide to make an acceptable guess as to what was supposed to be there. If the scratch is too wide and too deep it will just give up. A bodged attempt may end-up worse than the scratch. (Often a skilled touch up artist can make it dissapear, but machines on their own are not that smart yet.)
So the good news is that your camera is unlikely to be at fault.
If this shows on one film or a batch of films processed at the same time, take them back to the processor. (I have done this before and been paid a fair amount of compensation. If they printed them at the same time it should be obvious that the negs were scratched before you took them home.)
On the other hand if this is showing on films processed at the same place over a period of time then don't use them again.
If this is happening no matter where you get the film developed, then you might need to check you camera!
Posted on Jan 22, 2009
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Posted on Jan 02, 2017
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