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 Post subject: Sigma 17-70 F2.8 OS
PostPosted: Fri Jul 08, 2011 6:34 pm 
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Joined: Thu May 29, 2008 3:02 am
Posts: 444
Location: Chennai
Hi All

I heard about this lens and i am actually looking to mount it on 7D.

My considerations for general purpose lens are below.

Canon 15-85 IS
Canon 28-70 L
Sigma 17-70 2.8 OS

Among the above , which one do you think is lot better in optical quality for its price?

My third option will be 28-70 as 7D is crop censor , its not much advantage on 28 side , although i get a bit more on 70 side..

Please suggest me...

Cheers
Mano

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Canon EOS 5D mk III|Canon EOS 7D | 70-200 F2.8 L IS II USM | 400 F5.6 L USM


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 Post subject:
PostPosted: Fri Jul 08, 2011 7:00 pm 
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Joined: Sun May 25, 2008 12:48 pm
Posts: 8028
Location: UK
Ask yourself if you're asking the right question there. The tradeoffs are quite different amongst them, and to me would seem more important a differentiator than optical value.

The 17-70OS and 15-85 have both been reviewed at Photozone, and there isn't a huge amount between them in resolution. The 15-85 does seem to have an advantage at the longer end, but of course the Sigma has a bit more aperture and is a fair bit cheaper. Also consider other factors besides those.

The Canon 28-70L, just making sure you're not thinking of the current 24-70L and I assume that's an older model? Either way, of course make sure you don't need or otherwise cover wide angle if you care for it.

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Canon DSLRs: 7D, 5D2, 1D, 600D, 450D full spectrum, 300D IR mod
Lenses: EF 35/2, 50/1.8, 85/1.8, 135/2+SF, 28-80 V, 70-300L, 100-400L, TS-E 24/3.5L, MP-E 65, EF-S 15-85 IS
3rd party: Zeiss 2/50 makro, Samyang 8mm fisheye, Sigma 150 macro, 120-300 f/2.8 OS, Celestron 1325/13
Tinies: Sony HX9V.


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 Post subject:
PostPosted: Fri Jul 08, 2011 7:29 pm 
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Joined: Tue Oct 13, 2009 1:16 am
Posts: 237
I'm not sure which Sigma you mean. The Sigma 17-50 f2.8 EX DC OS HSM has constant f2.8 throughout the zoom range. There are two Sigma 17-70 lenses, the f2.8-4.5 DC Macro, and the (newer) f2.8-4.0 OS DC HSM Macro. Neither of these has constant f2.8.

I was recently in the same boat you're in now. I ended up getting the Sigma 17-70 f2.8-4.0. I didn't need the 15mm or 85mm of the Canon 15-85, because I have a Canon 10-22 and a Canon 85 f1.8. The macro capabilities of the Sigma were a nice benefit (although it's not true 1:1 macro; it's something like 1:2.6). And the Sigma was about 60% of the price of the 15-85.

Optically, it seems quite good, although I haven't done much with it yet. Perhaps by the end of this weekend I'll have some images to share. I have noticed that there's a bit of distortion at 17mm (nothing Photoshop can't remove), and it front-focuses a bit. This wouldn't be a problem, since the 7D has AF micro-adjustment. But it needs a lightly different adjustment at the long end and the short end, which is a bit annoying. (I decided to adjust for the long end, as I'll generally be using smaller apertures or manual focus at the wide end anyway.)

Either the Canon 28-70 or Canon 24-70 (I'm not sure which you intended) are missing enough of the wide end that I thought they wouldn't be versatile enough. They are also significantly more expensive, so I didn't consider them for very long. My decision was really between the Sigma 17-70 f2.8-4.0 and the Canon 15-85, and in the end I couldn't justify the cost of the Canon over the Sigma.

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Body: Canon Rebel XS, Canon EOS 7D
Lenses: Sigma 17-70mm f2.8-4.0 OS HSM DC Macro, Canon EF-S 18-55mm f3.5-5.6 IS II, Canon EF 50mm f1.8 II, Canon EF-S 10-22mm f3.5-4.5 USM, Canon EF 85mm f1.8 II USM


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 Post subject:
PostPosted: Sat Jul 09, 2011 2:28 am 
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Location: bit east of Melbourne
I think you need to decide how important wide angle is to you and how important aperture is.
For me there were only 3 options.
17-50 Tamron non VC
17-55 Canon
15-85 Canon

If 17-50 range is enough and aperture of 2.8 is important I would get this

Tamron SP AF 17-50mm f/2.8 XR Di II LD IF its an excellent lens ahead of the Sigma, or get the Canon 17-55, but its much more expensive.

If you think the wideangle is important, the 15-85 is hard to beat.

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Canon Powershot S95, Canon 6D,7D, Canon 40 2.8 STM, Tamron 24-70 2.8 VC, Canon 17-40 L, Canon 15-85, Canon 85 1.8, Sigma 30 1.4, 50mm 1.8, Canon 100 2.8L Macro, Canon 70-300L +Kenko 1.4 Pro 300DGX, Canon 430EX II and RS 4 Classic


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 Post subject:
PostPosted: Sat Jul 09, 2011 5:10 am 
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Joined: Thu May 29, 2008 3:02 am
Posts: 444
Location: Chennai
thanks for correcting me popo... :)

i was talking abt 24-70L and yes i have now taken it completely out of my choice , i'll buy it(if i want) only when i have full frame with me , not until i am happy with crop frame body for sure..

theorigamist/maxjj

Yes , i am actually looking for general purpose lens and yes i am looking for wide angle but not extremely wide , something like 15 or 17 will do... but i also need a bit fast lens and that pushes me a bit back on 15-85 but i read that this lens give some good optical quality... but sigma 17-70 F2.8(newer) OS is very good price but never heard abt it...

but onething for sure as i dont want to compromise on optical quality ... guess need to do some thorough investigation on 17-70... :(

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Canon EOS 5D mk III|Canon EOS 7D | 70-200 F2.8 L IS II USM | 400 F5.6 L USM


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 Post subject:
PostPosted: Mon Jul 11, 2011 8:22 pm 
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Joined: Tue Oct 13, 2009 1:16 am
Posts: 237
I went to a friend's wedding a couple of days ago, and I have a few sample images. (The only editing is in Adobe Camera Raw: white balance, exposure, noise reduction, etc.)

Image
ISO: 200
Exposure: 1/20 sec
Aperture: 13.0
Focal Length: 23mm
Note: The ceremony was outdoors. The sun is right above those trees.

Image
ISO: 400
Exposure: 1/160 sec
Aperture: 5.6
Focal Length: 46mm

Image
ISO: 6400
Exposure: 1/60 sec
Aperture: 3.2
Focal Length: 23mm
Note: There was no light here, and I had to apply heavy noise reduction. But this was my favorite shot of the night. (This was the very end of the couple's first dance.)

Overall, the lens performed pretty well for my purposes. If I were the official wedding photographer, I'm not sure if this lens would have made the cut. But as a budget walk-around option, I'd say this lens is a winner. The Canon 15-85, Canon 17-85, Canon 24-70L, Sigma 24-70, Canon 17-55 f2.8, and Tamron 17-50 f2.8 lenses are all probably worth considering, but all are significantly more expensive, and none are clearly better options.

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Body: Canon Rebel XS, Canon EOS 7D
Lenses: Sigma 17-70mm f2.8-4.0 OS HSM DC Macro, Canon EF-S 18-55mm f3.5-5.6 IS II, Canon EF 50mm f1.8 II, Canon EF-S 10-22mm f3.5-4.5 USM, Canon EF 85mm f1.8 II USM


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 Post subject:
PostPosted: Tue Jul 12, 2011 5:42 am 
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Joined: Thu May 29, 2008 3:02 am
Posts: 444
Location: Chennai
Hi Origamist

That was such a nice gesture from you.. thanks for those photos and yes i shud accept that last one was superb,fantastic and what not.. seems like you are making me to consider this lens seriously :)

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Canon EOS 5D mk III|Canon EOS 7D | 70-200 F2.8 L IS II USM | 400 F5.6 L USM


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