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New Contributor
Posts: 2
Registered: ‎02-22-2021

Question regarding FD lenses on modern cameras.

I recently got a Gobe FD to EOS adapter for my Canon T7i so that I can use my Uncle's FD lenses he's had in storage. One of the lenses is a 50mm f/1.8. No matter my shutter speed or ISO, when I open the aperture to f/1.8, any light source causes a soft glow to my images. I realize that by using FD lenses, I'll have softer images, but I was curious if this was an issue with the lens or my adapter seeing as it does not do this when my aperture is f/2.8 or higher? Or is this a common issue with fast FD lenses on newer bodies?

Esteemed Contributor
Posts: 4,548
Registered: ‎02-17-2016

Re: Question regarding FD lenses on modern cameras.

I suggest you post an image, it sounds like really bad chromatic aberration.

Reputable Contributor
Posts: 944
Registered: ‎12-24-2013

Re: Question regarding FD lenses on modern cameras.

[ Edited ]

That is typical of those cheap FD to EF adapters that need an optical correction element in order to maintain infinity focus. The corrective optics cause very bad image quality when you shoot wide open, and are barely adequate when stopped down. 

If you want to use your uncle's FD lenses just buy any brand Mirrorless camera and then you can use a simple adapter that doesn't require corrective optics. You will then get the best possible images, but keep in mind that these older lenses still need to be stopped down a little for optimum results.

Mike Sowsun
80D, 5D Mk III
VIP
Posts: 13,712
Registered: ‎12-07-2012

Re: Question regarding FD lenses on modern cameras.

"You will then get the best possible images,..."

 

Even the "best possible" will not be as good as the standard kit lens that sells with the T7i.  The best advice is to let the past stay in the past.  Let history sleep. Don't waste any more money on it.

EB
EOS 1DX and 1D Mk IV and several lenses!
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