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07-28-2010, 10:18 PM   #16
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dont i know it.

here is F/2 at iso 3200 and varying shutter speed.





Trying to freeze the action took a lot of work. The only light available was from the lightsabers.

07-29-2010, 03:54 AM   #17
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Original Poster
well, if f/2 is only capable at 17mm does it really matter when shooting indoors or low light? is there a version that can handle f/2 @ 70mm? the reason i ask is because if i'm going to be shooting indoors and NOT at 17mm, the faster speed won't help me will it will it? i guess what i'm saying is, i'm looking for a faster/sharper lens then the kit 18-55. its also worth noting that i don't know what a constant aperture means but i'm assuming its that the lens can handle f/2 @ 70mm. if that's the case, are constant aperture lenses capable of stopping down or are they stuck at that aperture?
thanks for the help. the reason i'm asking is because i'm buying the 17-70 sig on marketplace and want to make sure i'm buying the right lens.
07-29-2010, 04:19 AM   #18
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The above reports has typo. It should be f/2.8 as the wide aperture in the shorter end in 17mm. If you have a Pentax K-x and you don't mind the grain in iso 3200, my Pentax K-x white works quite well with Sigma 17-70mm f/2.8-4.5 DC 1:2.3 Macro


I have the older version and it is my 1-lens choice for easy walk-around. The size and weight is smaller than the similar alternatives such as the Tamron 28-75mm f/2.8.


Here are few shots in f/2.8 to f/4.0 using Sigma with Pentax K-x in Disneyland in dim light shooting


1/40 sec, f/2.8, iso 1600 , 0 Ev,
jpg, default NR medium, no pp



1/10 sec, f/2.8, 17mm, iso 12800 , 0 Ev
jpg, default NR, no pp, no flash,
on a moving boat, cropped center



1/30 sec, f/3.5, 35mm, iso 12800 , 0 Ev
jpg, default NR, pp with NR in iPhoto



1/125 sec, f/4.0, 63mm, iso 5000 , 0 Ev
jpg, default NR, no pp, no flash



The Sigma is very decent. Not that it gives you outstanding pictures in high ISO demanding type of shooting, but it does the jobs if you are not too picky. And the good high iso handling in K-x makes the Sigma shine even more. If image quality and constant f/2.8 is more important, I find my Tamron 28-75mm f/2.8 better suited and I use Tamron in wedding and formal events. The Tamron is heavier and bulkier to use when compared to Sigma


The Sigma also has another key advantage point in that it has decent close up in 1:2.3

Sigma 17-70mm f/2.8-4.5 DC Macro with Pentax K20D

Thanks,
Hin

Last edited by hinman; 07-29-2010 at 04:28 AM.
07-29-2010, 08:38 AM   #19
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QuoteOriginally posted by Ecaterin Quote

The trade off for bigger & heavy (omg that 70-200 is heavy even once I took the tripod collar off, but still very hand-holdable)
I find the weight makes it even more stable. I do try to park it on a monopod, though, which is becoming my best friend lately.

07-29-2010, 09:09 AM   #20
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QuoteOriginally posted by SpecialK Quote
I find the weight makes it even more stable. I do try to park it on a monopod, though, which is becoming my best friend lately.
What monopod will work well with your heavy 70-200mm lens? I need to know as I have less keepers that what I would like in shooting with my Tamron SP 80-200mm f/2.8 adaptall-2 30A. I tried it on a cheesy mono-pod and it is more of a drag than help. I like to explore options with recommendations by others






Tamron SP 80-200mm f/2.8 Test Shots

lens weight: 3 pounder
with collar and adapter: likely 3lb 4 oz.

Thanks,
Hin
07-31-2010, 09:39 PM   #21
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QuoteOriginally posted by SpecialK Quote
I find the weight makes it even more stable. I do try to park it on a monopod, though, which is becoming my best friend lately.
I actually just ordered a monopod to go with it - I hope it's a good match, because hand holding for individual shots is one thing, hand holding for an event that lasts over an hour is quite another :P
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