Sigma 17-70mm Owners part 2

ok screwed last poll up with my wording...sorry..

ok if you own the 17-70 sigma do you have any backfocusing issues?

in macro mode I find it very hard to focus! also some of my landscapes are not as sharp as I was hoping for out of the lens, when it gets it right the results are great

OK, what if you bought one that back-focussed, then returned it for a replacement? Is that a yes or a no?

gcogger wrote in post #2788861
OK, what if you bought one that back-focussed, then returned it for a replacement? Is that a yes or a no?

i guess it's a yes and a no!

Thats a yes, answer on how you get it.

As for me, as stated in the other thread, mine is a bf but i use MF all the time anyway so im going to live with it. Its not tooo bad anyway.

grinchy-

I think there are a few parameters here. First, what classifies as a focusing issue? Like how much backfocus do you need to call it a focusing issue, or does it have to be 100% accurate? There are some users here who have it 2-4mm OOF. Also, like gcogger mentioned, what if the first copy was bad and second copy was perfect?

I'd like to consider both scenarios focusing issues in my book.

pythagpython wrote in post #2789567
grinchy-

I think there are a few parameters here. First, what classifies as a focusing issue? Like how much backfocus do you need to call it a focusing issue, or does it have to be 100% accurate? There are some users here who have it 2-4mm OOF. Also, like gcogger mentioned, what if the first copy was bad and second copy was perfect?

I'd like to consider both scenarios focusing issues in my book.

the point is just because you had 2 bad copies does not make the 17-70 a bad lens period! you can analyze this poll however you want just wanting you to see the good to bad ratio of this lens.

grinchy wrote in post #2789932
the point is just becasue you had 2 bad copies does not make the 17-70 a bad lens period! you can analyze this poll however you want just wanting you to see the good to bad ratio of this lens.

He was just asking for clarification of the question (as was I). Still waiting for an answer...

gcogger wrote in post #2788861
OK, what if you bought one that back-focussed, then returned it for a replacement? Is that a yes or a no?

what does the poll ask?
Does Your Sigma 17-70 have backfocusing issues?

it's not how many 17-70's did you have to go through to get a good one..

Ospi wrote in post #2789436
Thats a yes, answer on how you get it.

Correct!

After seeing the threads about this I decided to test mine and it performed quite well.

good to hear...besides best way to tell is in your pictures...

grinchy-

I am as interested in this poll as you are, however I'd like it to be accurate. I think that the objective of this poll is to see how Sigma's QC is, so I think it would be most helpful to select "Yes" if your lens has ever back focused originally, and not after you sent it in for calibration.

Also could you post a link to the focus test on the top?
Focus Test

And for people who don't know what backfocusing looks like, here are links to my threads:
First Thread
Second Thread

pythagpython wrote in post #2790394
grinchy-

I am as interested in this poll as you are, however I'd like it to be accurate. I think that the objective of this poll is to see how Sigma's QC is, so I think it would be most helpful to select "Yes" if your lens has ever back focused originally, and not after you sent it in for calibration.

Also could you post a link to the focus test on the top?
Focus Test

And for people who don't know what backfocusing looks like, here are links to my threads:
First Thread
Second Thread

tired of making polls...how about you make 1 the exact way you want it?

grinchy-

Just edit your first post to include the focus test. I'm not trying to be hostile or anything, just want to get an accurate sense of this problem.