Is My Canon FD 28/2.8 S.C. Malfunctioning?

[FilmOnly]

I recently acquired a Canon FD 28/2.8 S.C. lens. I notice that when I release the shutter, the viewfinder becomes dim for a second or two. It would appear that I am seeing the effect of the lens diaphragm close down and then reopen. None of my other FD lenses do this (whether earlier versions of later versions). Should I be concerned about what I have observed? I have yet to process any film shot with this lens.

 

[MattKing]

It sounds like the lens diaphram is in need of cleaning - the leaves are slow and sticky.

You may find that the exposure is erratic.

You most likely need at least a CLA of the lens.

Matt

 

[Jeff Kubach]

I agree with Matt, just need CLA of the lens. It is an excellant lens well worth the expense.

Jeff

 

[benjiboy]

I don't know which FD Body you are using it with , but It's easy to check by pressing the stop down lever,releasing it, and see how quickly the diaphragm reacts, as the other guys say it probably needs a CLA.

 

[FilmOnly]

I use the F-1N, A-1, and AE-1P. I agree: the lens is worth the CLA. The New FD 28/2.8s are as common as dirt. The 28/2.8 S.C. is harder to find and tested better. I prefer the breech mount lenses anyway.

 

[benjiboy]

I think we should remember all Canon FD equipment is more than twenty years old, and has had no maintenance, the majority of it could benefit from a CLA, I think rather than buy another one I would get a CLA done so at least I would know it was right.

 

[FilmOnly]

I have already done so. It sent it out for a CLA a couple of days ago.