Canon FD lens repair

[Stan Hesketh]

I have a Canon FD fit lens (1.8) which is a nice lens, except there is some aberration at certain apertures. Question is; should I have a look inside it? It wouldn't be a huge loss if I trashed it, I might learn something (i.e. don't dismantle lenses ) and there is an outside chance that I might fix it. I do wonder what is causing he aberration though; perhaps it has been dropped at some stage in its long career, although there are no signs of damage externally.

I found this for a similar Canon lens: Canon FD Lens Service

Anyone else managed a similar repair?
Many thanks.

 

[Hamish Gill]

Give it a go! Worth a try!! I'd do it!
have a look at my YouTube, tried similar ...

 

[Stan Hesketh]

Thanks for the encouragement and the Youtube links, Hamish. The EOS shutter video is interesting too. When I am released from the decorating at home, I will attempt a repair on the lens as there is little to lose. I believe something must be out of alignment to give the uneven focus effect.

As an aside, I used to have a book (photocopied) by an American camera repair technician which has sadly got lost over the years. It was full of interesting/useful repair information and I would like to get another copy. Does anybody know the book to which I refer, and could they please remind me of either the author or the title?
Many Thanks

 

[Pete Askew]

Was it these?

Camera Maintenance and Repair: Book 1 Fundamental Techniques - Thomas Tomosy, Michael McBroom - Google Books

http://www.amazon.co.uk/Camera-Maintenance-Repair-Advanced-Techniques/dp/0936262583

 

[Stan Hesketh]

I thank you, sir! I will add to my shopping list

 

[Adam Lewis]

I bought a pentacon 50mm 2.8 pancake off ebay which was ridden with mould and dust for dirt cheap, just to give lens repair a go, yes it's not quite a repair, nor did it involve re-aligning anything, but it was a fun little day and it turned out that it was only the 1st (backside) and 2nd (frontside) elements that were filthy, and similarly with the rear 1st and second. Though I did take apart the aperture blades to give them a wipe over (was a struggle to put back mind you) but it all works now, clean and clear.

- - - Updated - - -

I bought a pentacon 50mm 2.8 pancake off ebay which was ridden with mould and dust for dirt cheap, just to give lens repair a go, yes it's not quite a repair, nor did it involve re-aligning anything, but it was a fun little day and it turned out that it was only the 1st (backside) and 2nd (frontside) elements that were filthy, and similarly with the rear 1st and second. Though I did take apart the aperture blades to give them a wipe over (was a struggle to put back mind you) but it all works now, clean and clear.

 

[Stan Hesketh]

There's a thought. I might well look for a really rough same type lens on ebay and give that a go first Whilst I paid little for the lens in question, it is in good nick overall with this one annoying trait. I bet if used when making smallish prints that the efect wouldn't even be noticable.

Another thought; if the lens mount on a camera body was a couple of thou out of aligmnment, how significant an effect would this have on the photo?

 

[Pete Askew]

If is was just shifted off-axis then not much but if it were no longer perpendicular to the film / sensor plane then that could easily cause mis-focussed areas.