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PostPosted: Mon Oct 06, 2008 5:06 am 
Hi
What is your opinion about this lens and it is suitable for different cases
Sigma 18-200mm F3.5-6.3 DC OS

and is it compatible with canon EOS 450D


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PostPosted: Mon Oct 06, 2008 5:16 am 
it is compatible with 450d

i think the focal length is great, but i am sure that it is not as good as canon 18-200 is (new lens) probably $200 more expensive.

and it is pretty slow lens f/6.3 at 200mm compare to canon f/5.6

The OS will help 1-2 stops.

Overall it is a budget all around lens.

If you don't mind changing lens, then Canon EF-S 55-250mm IS might be a better deal since it is only $250 and has better aperture at 200mm


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PostPosted: Tue Oct 14, 2008 5:46 am 
Very good lens for traveling and a good lens for all-around purposes. I use it as my default lens.

For me, OS can deliver up to 3 or 4 stops, and for some reason it works a little when I switch it on (it should start working completely when you half-press the shutter).

Cons include corner sharpness issues in the wide to middle part of the focal range, though the centre of the lens has much better sharpness than that of the non-OS version. However, I've noticed some chromatic aberration with this lens, especially when photographing buildings. Also, being a superzoom, barrel and pincushion distortion also happens. Because of the long barrel, I'd suspect dust gets into the lens easily (as I think mine might! :? ), and it's not weather-resistant either. Also, if you're a Canon or Sigma user, you still don't get an ultrasonic motor (HSM in Sigma's terms) with the lens, while the Nikon version kinda equals Nikon's own lens by having an HSM motor, so that it is compatible with the D40, D40x and D60. The Sigma costs about $200 less than the Nikon lens. It's well worth the price that it is now, having dropped nearly half it's launch price.

This lens is somewhat of a compromise lens, and the maximum aperture at 200mm is F6.3, in comparison to Nikon and Canon's F5.6. However, in conculsion it is a great lens and well worth it at the price point it is now. It is my default lens for general photography, from Landscape, to Macro, to Telephoto!


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PostPosted: Tue Oct 14, 2008 7:02 pm 
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Joined: Fri Sep 26, 2008 5:32 pm
Posts: 195
Location: California, USA
I am also looking at this lens for my Nikon D80. I used the Nikkor 18-200mm VR over the weekend and fell in love with it! Seeing a lower price Sigma is appealing... but the f/stop difference caused me to pause. I'll see if I can get my hands on the Sigma from the local renters and see how it goes... Perhaps do a mini "Compare these shots" thread... unless Gordon beats me to it. :P

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Best regards,

Daniel

danielmcglaughlin.com
Nikon D80 · Nikkor 50mm f/1.8 AF
Sigma Foveon sensor fan... future owner, promise!
flickr me!


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PostPosted: Tue Oct 14, 2008 8:14 pm 
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Location: Germany
Have a look at this review.
And compare this tho the same review of the Nikon 18-200 there.

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Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews, My Pictures, My Photography Blog
D800+assorted lenses


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PostPosted: Tue Oct 14, 2008 9:18 pm 
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Joined: Fri Sep 26, 2008 5:32 pm
Posts: 195
Location: California, USA
Thanks for the links...

That reviewer seems to expect more for the money from the Nikkor.

However, seeing the Depth of Field issues from the Sigma... I will not be purchasing it. I really love to play with Depth of Field so it's important to have nice blurry images where I how I want them. :)

_________________
Best regards,

Daniel

danielmcglaughlin.com
Nikon D80 · Nikkor 50mm f/1.8 AF
Sigma Foveon sensor fan... future owner, promise!
flickr me!


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PostPosted: Thu Sep 10, 2009 6:24 pm 
Sigma 18-200mm f/3.5-6.3 DC OS HSM etc. on Nikon D90.

I chose the Sigma lens after reading many reviews etc but think I made the wrong choice. Results vary between very good and crap/out of focus even though Nikon ViewNX shows the alleged focus points. Found it poor in photographing anything that moves (slow focusing??) whatever ISO/shutter speed used.

I experimented for months then found the likely answer at SLRgear:
http://www.slrgear.com/reviews/showprod ... 007/cat/31
where the Blur index does much to explain the very variable results.
At some settings the profile looks like Gordon Laing's NZ mountain peaks.

I also think there may be an issue with the OS!!!

So all in all, far from being a happy bunny. Presently looking at Nikon 18-200 VR, Tamron 18-250 or a Nikon 2-lens option.

Stephen


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