Problems with a sigma 75-200mm F3.8 AF

EDstrg87 · 10-09-2019, 08:00 AM

I have a problem:in the last 3 months seems like it's not able to focus to infinity in AF and in MF;in a range of 10 meters it focus fast and accurate..What do you think could be?

**Bruce Clark** · 10-11-2019, 08:24 AM

Originally posted by EDstrg87

I have a problem:in the last 3 months seems like it's not able to focus to infinity in AF and in MF;in a range of 10 meters it focus fast and accurate..What do you think could be?

Not sur eif this helps.

I had similar problem with Sigma 70-200 HSM. Originally purchased as a demo unit from CR Kennedy, The Australian distributor. It would focus well at short distances but anything over 20-30 metres. It took a bit of convincing the repair people of the problem but once they accepted it they took it apart and determined a faulty circuit board. In the end they replaced the lens as a new board would take weeks to obtain.

EDstrg87 · 10-11-2019, 11:25 AM

Thanks for the reply! The problem is that even in MF i can't focus to infinity.. i think that some glasses are misplaced. it's a legacy zoom, so i don't know if repair it or not

Vasyl · 10-11-2019, 11:30 AM

Misplaced glass? Is that possible?
You are not able to get in focus for all the focal distances?

EDstrg87 · 10-11-2019, 01:36 PM

Originally posted by Vasyl

Misplaced glass? Is that possible?
You are not able to get in focus for all the focal distances?

I don't know.. If the subject is within a range of 10 meters i can focus it.. After that not

Vasyl · 10-11-2019, 03:59 PM

Originally posted by EDstrg87

I don't know.. If the subject is within a range of 10 meters i can focus it.. After that not

My question was...are you dealing with this issue at 75mm, 100mm, 150 mm and 200mm?

EDstrg87 · 10-12-2019, 01:58 AM

i can zoom from 75 up to 200 and focus without problems but if the subject is far 10 meters from me i can't focus it... and that's pretty strange

10-09-2019, 08:00 AM	#1
EDstrg87 Forum Member Join Date: Sep 2019 Photos: Albums Posts: 69	Problems with a sigma 75-200mm F3.8 AF I have a problem:in the last 3 months seems like it's not able to focus to infinity in AF and in MF;in a range of 10 meters it focus fast and accurate..What do you think could be?

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10-11-2019, 08:24 AM	#2
Bruce Clark Loyal Site Supporter Join Date: Mar 2010 Location: Ocean Grove, Victoria Photos: Gallery \| Albums Posts: 4,318	Originally posted by EDstrg87 I have a problem:in the last 3 months seems like it's not able to focus to infinity in AF and in MF;in a range of 10 meters it focus fast and accurate..What do you think could be? Not sur eif this helps. I had similar problem with Sigma 70-200 HSM. Originally purchased as a demo unit from CR Kennedy, The Australian distributor. It would focus well at short distances but anything over 20-30 metres. It took a bit of convincing the repair people of the problem but once they accepted it they took it apart and determined a faulty circuit board. In the end they replaced the lens as a new board would take weeks to obtain.

10-11-2019, 11:25 AM	#3
EDstrg87 Forum Member Join Date: Sep 2019 Photos: Albums Posts: 69 Original Poster	Thanks for the reply! The problem is that even in MF i can't focus to infinity.. i think that some glasses are misplaced. it's a legacy zoom, so i don't know if repair it or not

10-11-2019, 11:30 AM	#4
Vasyl Pentaxian Join Date: Aug 2010 Photos: Gallery Posts: 645	Misplaced glass? Is that possible? You are not able to get in focus for all the focal distances?

10-11-2019, 01:36 PM	#5
EDstrg87 Forum Member Join Date: Sep 2019 Photos: Albums Posts: 69 Original Poster	Originally posted by Vasyl Misplaced glass? Is that possible? You are not able to get in focus for all the focal distances? I don't know.. If the subject is within a range of 10 meters i can focus it.. After that not

10-11-2019, 03:59 PM	#6
Vasyl Pentaxian Join Date: Aug 2010 Photos: Gallery Posts: 645	Originally posted by EDstrg87 I don't know.. If the subject is within a range of 10 meters i can focus it.. After that not My question was...are you dealing with this issue at 75mm, 100mm, 150 mm and 200mm?

10-12-2019, 01:58 AM	#7
EDstrg87 Forum Member Join Date: Sep 2019 Photos: Albums Posts: 69 Original Poster	i can zoom from 75 up to 200 and focus without problems but if the subject is far 10 meters from me i can't focus it... and that's pretty strange

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