05-29-2024 05:16 AM
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.
05-29-2024 06:25 AM
@theorium wrote: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.
The AF system needs contrast to focus. What focusing mode are you using? Do other lenses show a similar behavior when trying to photograph the same subjects?
05-29-2024 08:52 AM
I tried with my Tamron 24-70 and the infamous 50mm f/1.8 II and they had difficulty pinpointing the focus but were more successful and didn't on loop
05-29-2024 10:09 AM
Greetings,
In addition to John's suggestions, please ensure you are not attempting to focus on a subject closer than the lenses MFD (12 inches).
~Rick
Bay Area - CA
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05-29-2024 12:59 PM
thanks, but no that's not the problem
05-29-2024 11:01 AM
Sounds like you just need more light.
05-29-2024 01:00 PM
kinda yes, so is the behaviour of the lens normal you say?
05-29-2024 02:57 PM
@ebiggs1 wrote:Sounds like you just need more light.
Specs for 6D show AF down to EV -3. That's basically full moon at night.
05-29-2024 02:45 PM
Hi and welcome:
It would be helpful to know precisely what settings you using for focus:
Focus type - One shot, AI, or Servo
selectable focus points = 61, Only cross-type, 15 Points, 9 points
Has anything else changed? A different setting of any kind, a front filter etc.?
Thank you.
05-30-2024 06:39 AM
one shot , 9 points (using the center) no filters,
based on the questions everyone is asking, I am assuming the lens has a problem.
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