Simviation Forum - Lens Tuning

Jan 14^th, 2012 at 11:41pm

jrom Offline
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So...

I recently bought a Canon 50mm 1.4 USM to go on my T3i. I LOVE it, but at low apertures, autofocus puts the focus about 5-10 feet in front of my target (50 feet away), making the picture unusable about 40% of the time.

My question is, where do I go\send my camera off to get my camera\lenses adjusted?

Thanks in advance!

« Last Edit: Jan 15^th, 2012 at 9:38am by jrom »

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Reply #1 - Jan 15^th, 2012 at 8:59am

expat Offline
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jrom wrote on Jan 14^th, 2012 at 11:41pm:

So...

I recently bought a Canon 50mm 1.4 USM to go on my T3i. I LOVE it, but at low apertures in low(er) light, autofocus puts the focus about 5-10 feet in front of my target (50 feet away), making the picture unusable about 40% of the time.

My question is, where do I go\send my camera off to get my camera\lenses adjusted?

Thanks in advance!

I am assuming that you are in an auto setting. Does it also do the same thing when you use spot focusing. My Nikon D7000 sometimes gets it's knickers in a twist at low light low aperture settings and pulses back and forth trying to find focus. I then set to spot focusing and the problem ceases. Auto focus is good, but only to a point, you may have just come up against the light limits of the auto focus. Also if this is not the case, I would ask around at one of the thousands of dedicated Canon websites. The forums are full of people who (think) they know more than Canon themselves, certainly the case for the Nikon Grin

Matt

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Reply #2 - Jan 15^th, 2012 at 9:38am

jrom Offline
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I probably shouldn't have put low light, I just went outside to try again, and it's plenty bright, so it seems to be the AF. Roll Eyes

No, I'm using manual setings, so it is most definitely the lens\body.

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Reply #3 - Jan 17^th, 2012 at 9:57am

Jared Offline
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try cleaning the contacts on the lens and the body with a pencil eraser, helps to create connectivity between the two components.

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Reply #4 - Jan 19^th, 2012 at 4:34am

Hagar Offline
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Jared wrote on Jan 17^th, 2012 at 9:57am:

try cleaning the contacts on the lens and the body with a pencil eraser, helps to create connectivity between the two components.

Thanks for that Jared. Your little tip fixed a similar problem I've been having with a new lens on my 400D. Smiley

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Reply #5 - Jan 19^th, 2012 at 5:51am

expat Offline
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Jared wrote on Jan 17^th, 2012 at 9:57am:

try cleaning the contacts on the lens and the body with a pencil eraser, helps to create connectivity between the two components.

I use an ink rubber, a pencil rubber tends to leave a film behind. However be gentle, the ink rubber can be quite abrasive.

Matt

PS have you checked in with any specialist Canon forums about your problem yet??

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Reply #6 - Jan 19^th, 2012 at 11:34pm

jrom Offline
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Go CAP!
Location: Earth

Posts: 203

Jared wrote on Jan 17^th, 2012 at 9:57am:

try cleaning the contacts on the lens and the body with a pencil eraser, helps to create connectivity between the two components.

This didn't seem to help. Sad

expat wrote on Jan 19^th, 2012 at 5:51am:

PS have you checked in with any specialist Canon forums about your problem yet??

I probably should. Wink

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Reply #7 - Jan 22^nd, 2012 at 4:39am

Ivan Offline
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Does that one have an AF guide light? If not, open the flash but tell it not to use it for the picture

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