Problem with focusing ... -- Canon Digital Cameras in photography-on-the.net forums

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330 posts
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Joined Jan 2009
Location: Rockies

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Mar 24, 2012 16:44 | #1

Using a 450D with a Sigma lens...

Purchased 10/11 from Amazon - listed as used, but seller stated "Lens is new but I can't sell it that way - selling as 'used', but in factory fresh condition" .. I also have the warranty card.

Sigma 70-200 f/2.8 APO EX DG OS

Have never been happy with the focus on this lens and can't decide if it's me, or the lens.. Always seem soft and OOF a little. Even when I focus manually and use live view - zoomed in.. when I twist the focus ring, it gets more in focus and then without obtaining 'crack sharp', it goes blurry to the other side again..

Here are a couple of examples - both on a tripod with a 2 sec shutter delay.. f/10, 200mm, ISO 100, exp 1/25

The first pic is focused using Automatic

IMAGE: http://farm8.staticflickr.com/7110/6865893592_564100cbaf_c.jpg

and this one is focused Manually ............. both on a tripod.

IMAGE: http://farm8.staticflickr.com/7070/7012004479_7200121cfd_c.jpg

Both taken at 200mm, but I can guarantee you that a lesser focal length produces approx the same image. OS turned off due to it being on a tripod..

First - do you see any focusing issues ?? - If so, is my warranty good with Sigma? I just want someone to check and see if there
is an issue with the lens, and the closest camera shop is 135 miles away .. Can/should I just send it to Sigma with the warranty
card and see what they say ??

thanks,

r

Rick

There's nothing more exciting than to be shot at............... and missed! ... Then, you're alive like you've never been before..

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nate42nd

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Joined Mar 2010
Location: The Wild West

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Mar 24, 2012 17:05 | #2

Here is the "sticky" you can read at the top of the EOS camera page. I would read this first.

https://photography-on-the.net/forum/showthread.php?t=857871

You may want to do some focus checking on your own just to make sure it is indeed the lens. It cannot hurt. This way you will now you have a problem for sure. I have a PDF but can't find the link for a good printable chart you can fold and check focus. I used mine for MA in my 7D. The 450D does not have that feature. If you find a problem then check with another lens to determine if your problem is the lens or the body....then go from there. It will give you the info you need if you don't have any shops close to your home.

Here is one

https://photography-on-the.net/forum/showthread.php?t=750736

Something like what this person did might help you.

https://photography-on-the.net/forum/showthread.php?t=393222

7D - - 17-55 F/2.8 - 24-105 F/4L - 100mm F/2.8 - 50mm F/1.8 - S95 / To see all click here
My Flickr

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ottor
THREAD STARTER

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330 posts
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Joined Jan 2009
Location: Rockies

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Mar 30, 2012 21:36 as a reply to @ nate42nd's post | #3

Well, problem solved !! - It was only this lens.. I replaced the Circular Polarizer filter .. a cheap Vivitar, with a "REALLY NOT cheap Kenko filter, and it's now what I would consider "Perfect"! Image is sharp and clear - and worthy of an expensive lens....

You really do get what you pay for !

r

Rick

There's nothing more exciting than to be shot at............... and missed! ... Then, you're alive like you've never been before..

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