Sigma 70-300 DG APO v Non APO

So my wife and I are new to the scene.
I have been wanting to get a new lens for this years State Fair.
We have a Rebel XT.

Looking at B&H can someone tell me the difference between these two lenses?
http://www.bhphotovide​o.com …ghType=category​Navigation

http://www.bhphotovide​o.com …ghType=category​Navigation

Thanks!
Michael

Well, I had the choice and I wen't with the non-APO version because I was tight for money. I am very happy, it is actually my first telephoto. It tends to get soft after 200mm, which can be a bit of a problem when in macro-mode (which can be activated between 190-300mm on mine, supposed to be 200-300mm).

I'm happy with it, I got what I expected for $175 CAD. Its a good lens IMO, but can't be compared to any of the L's (wouldn't expect it too :P).

It is really sharp when f/8 to f/11.

I'm not sure about the APO version, other than it has better glass.

Some examples (they are web shots, so not the best indicators, I'll post some 100% crops if I can get around to it):

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Bentwood Blue,

I have the APO version, it's denoted by a red ring. Apparently it is suppossedly optically better than the non-apo version. Like Mediasoldier said, it's not L quality by any means, but for my limited telephoto needs it's a great bargain for your dollar. My biggest complaint is that the autofocus motor is loud and buzzy. Here's a couple images to show the sharpness of the lens.

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It's definitely a sharp lens when used inside it's limitations, and with proper technique. What do you want to shoot with the lens?

Two more of a different subject:

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Interesting thread which I'll keep a eye on. I'm also new to the scene have 300D and been thinking this would be my first additional lens to my kit...assuming it is ok on the 300D also...is it?

Like all cheap lenses they won't be perfect - there will be compromises, however the APO version regularly wins the best buy award for budget zoom lenses. If you need a lens with this reach, that gives acceptable results, then the Sigma will do the job. If you want ultra-fast silent focusing, exceptional sharpness at all lengths and f-stops, then save up for a lens from the next tier of pricing up.

bought this lens about 2 weeks ago now, until nlow im very happey with it
fcusing is fast if you have good light
heres a few pics

one more

Had the APO and a very good lens for the cash. I did a Poll a few months back and all owners or ex owners rated it highly. A safe buy. Used correctly, and ideally on a mono/tripod like any longer lens, then I think you will like it

The non APO gets few recommendations but I have never used it myself so can't comment.

I've owned the Canon 75-300 EF 4/5.6 USM and the Sigma DG Super Macro 70-300 4/5.6 but not the APO version. Between the two the Sigma was the clear winner, I did several side by side comparisons.

Honestly, at 300mm neither one would produce a very sharp photo, but perhaps I was using them incorrectly. I have heard many good things about the Sigma APO version.

Recently I obtained a Canon 70-300 USM IS and it seems to be much sharper at the long end although it is at least twice the price.

I've got photos and data to back this up if anyone is interested just email me.

The APO and non-APO are optically identical really, the only difference between the two is the APO version has 3 SLD elements in it (2 in front and 1 in back) while the non-APO only has the front SLD element. The Extra SLD elements basically make CA/PF almost non-existent. I own the non-APO and non-DG model and have always loved it, but if you can swing the extra $$ get the APO version.

Here are some shots from mine I have taken. Three of which I have had printed upto 16x20" and are quite sharp and excellent prints.
http://www.pbase.com/d​igitaldevo/sigma_70_30​0mm

They do get softer after about 250mm, atleast mine does, but even @ 300mm a little contrasting USM and slight curves in PS and not a problem

That horse image is stunning Jamey.

Thank you That is one of my favorite shots.

APO lens stands for apochromatic, if memory serves me right.
It should have less purple fringing. I'd recommend the APO version.

Thanks for the responses guys. I think I will keep my eye out for the APO. I am planning to buy later this month. However if a used deal comes up I will buy either and it looks like I will be happy.