Sigma 17-50 2.8 EX DC OS

A few from last weekend in Maine..

IMAGE LINK: http://www.flickr.com/​photos/ajtooke/5930376​085/

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Hey Repoman --

Are you using a UV filter? I got the same(ish) colored flair shooting a sunrise a couple of weeks ago (see the bottom of your last photo)

one from my daughter with this lens on a 10d camera work is all her but i bumped clarity and vibrance

IMAGE LINK: http://www.flickr.com …/65153528@N05/5​934911017/

Mistabernie wrote in post #12762130
Hey Repoman --

Are you using a UV filter? I got the same(ish) colored flair shooting a sunrise a couple of weeks ago (see the bottom of your last photo)

No, just the lens. I saw the flare on that picture and figured it was just due to shooting straight into the sun. Can't really be helped can it?

repoman wrote in post #12762916
No, just the lens. I saw the flare on that picture and figured it was just due to shooting straight into the sun. Can't really be helped can it?

That's what I figure, but I'm wondering if a CPL would affect the flare..

Mistabernie wrote in post #12764122
That's what I figure, but I'm wondering if a CPL would affect the flare..

Adding any glass in front of the lens has a potential for adding optical imperfections like increased CA, increased flare, etc.

When asking "does anyone have any problems with flare" about a lens, make sure you're using it filter-less.

So I got my Sigma replaced, by Merkle Camera, and what a difference it made! From a copy which had severe AF issues (I needed MA=-10 at 50mm, and MA=0 at 17mm) - as bad as my copy of Tamron 17-50mm non-VC (-5 at 17mm, +5 at 50mm), to the current copy which only required a minor adjustment (MA=-2), most importantly - the same adjustment at any FL, and any distance!

The lesson which I first I learned with my Tamron is again confirmed, with the Sigma, - always buy fast zooms from places with a good return policy, even if your body can do focus micro-adjust.

Other observations regarding AF: both Tamron and Sigma do not focus properly under fluorescent light (incl. LCD monitors and TVs), and with red focus assist light from external flashes. It's probably the issue with all fast zooms. So when you calibrate AF, forget about displaying the target on LCD monitor, and don't use artificial light (fluorescent, and I think even tungsten) - always use daylight, and the more of it, the better.

Pulsar : Congrats

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^^ Nice shot

@ 30 mm

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maybe you guys can shed some light on my issue .
i bought it from b&h 2 months ago. so its past the return policy , the Af is pretty inconsistent , not spot on, but at 50mm its better, at 17mm its not as good. if i do any amount of ma on the lens it goes further out of focus. not in focus. i have yet to see an amzingly sharp image from this lens . and here is the odd thing. if i use my flash with this lens ( 430 ex ) then it does not even focus correctly at all. its the oddest thing i have ever seen . should i call sigma ? sell it ? its my first sigma lens and im already not that happy with it .

send it in that aint right.

any idea on how long it takes ? i have a wedding i have to shoot in 4 weeks

no idea sorry.