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my EF 100mm f2 has problem focusing on low contrast objects and eyes

theorium
Contributor

I have an EF100mm f2 that I use on my EOS 6D (also taste on EOS500D). there are a lot of instances when it goes on an endless hunt for focus and never stops till I move it. it starts going in and out. it mostly happens on low contrast objects but it happens on high-contrast things too, which the most annoying one is focusing on eyes.
I want to know if it's a common issue with this oldy lens or if I should send it for repair.

13 REPLIES 13

deebatman316
Elite
Elite

I would like to confirm which lens you have. Canon has released 3 revisions of this lens over the years. The L lens is the most up to date version of the lens.


-Demetrius

Current Gear: EOS 5D Mark IV, EF F/2.8 Trinity, EF 50mm F/1.8 STM, EF 85mm F/1.8 USM, 470EX-AI & 600EX II-RT

Retired Gear: EOS 40D

There is an EF 100mm f/2 USM that was launched in 1991 - it's similar to the EF 85mm f/1.8 USM launched in 1992. They are both different to the macro 100mm lenses which were all f/2.8 maximum aperture including the most recent EF 100mm f/2.8L Macro IS USM.


Brian
EOS specialist trainer, photographer and author
-- Note: my spell checker is set for EN-GB, not EN-US --

Yes I am aware of that that. The manual for this lens is no longer available anymore. It's design is based off the EF 85mm F/1.8 USM lens. It is also not a Macro lens either like its F/2.8 counterparts. My uncle used owned the original EF 100mm F/2.8 Macro lens from 1990 it used an Arc Form Drive (AFD) AF motor. Not the newer Micro Motor seen in newer designed lenses released in 1993 onward.


-Demetrius

Current Gear: EOS 5D Mark IV, EF F/2.8 Trinity, EF 50mm F/1.8 STM, EF 85mm F/1.8 USM, 470EX-AI & 600EX II-RT

Retired Gear: EOS 40D

jrhoffman75
Legend
Legend

Maybe this:

01_CT1-8536_ENG.pdf

John Hoffman
Conway, NH

1D X Mark III, M200, Many lenses, Pixma PRO-100, Pixma TR8620a, Lr Classic
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