partially agree..its just me that is irritated by the focus sound... esp when u r taking shots in a quiet environment..
Maybe can consider using manual focus in such situations?
Sigma 17-70 OS HSM
- Thread starter rayalphacanon
- Start date
Maybe can consider using manual focus in such situations?
rayalphacanon
New Member
Will try that though..
but still very interested in Sigma.. for IQ purpose.. any advice on that?
rayalphacanon
New Member
Well, actually i meant the kit lens is noisy when it turns on auto focus.. is it that 17-70 is really louder? no change to test it out le..
rayalphacanon
New Member
Any reasons for that?
jammerwong
New Member
I felt the same too. It is better to have constant f2.8 , given the price is not so much different.
jammerwong
New Member
But between 16-105 and 17-50 , there is an additional 50mm , which may be useful.
But between 17-70 and 17-50, there is only a 20mm difference, but at a smaller aperture, I would rather 50mm at f2.8.
Galdor
Senior Member
True also bro. But I must say that the IQ from the 17-50mm is pretty good.
If focal length isn't an issue, I feel the tamron 17-50 is the best zoom lens, even better than cz 1680.
I have both 1750 and 1680, and sharpness comparison at f4.5, the tamron's center is as sharp as the cz's center. However the corner of the cz loses to the tamron. Its an expected result though, as the cz at f4.5 is at its widest aperture whereas the tamron has f2.8.
Stepping down to f8,both corners are on par, with the cz marginally sharper in the center.
So for anyone who do not need to use beyond 50mm, the tamron will be the best lens for u imo,as the f2.8 will be very useful in low light as well as offering more control over dof.
I have both 1750 and 1680, and sharpness comparison at f4.5, the tamron's center is as sharp as the cz's center. However the corner of the cz loses to the tamron. Its an expected result though, as the cz at f4.5 is at its widest aperture whereas the tamron has f2.8.
Stepping down to f8,both corners are on par, with the cz marginally sharper in the center.
So for anyone who do not need to use beyond 50mm, the tamron will be the best lens for u imo,as the f2.8 will be very useful in low light as well as offering more control over dof.
anyway while we are on the same topic on sigma's new hsm. I saw some people posting up focusing issues with sony cams over the net. Has this issue been resolved or does it randomly happen to people due to the QC? im considering the 10-20 f3.5 HSM but im not sure if the focusing issues are still around..
synapseman
Senior Member
QC issues are always a problem with 3rd party lenses. That's why it's better to get them locally, easier to take back to agent to re-calibrate. For Sigma, there is quite a concern about calibration (front/back focus) and this crops up not that often honestly, but often enough. A lens that is sharp on one body may not necessarily be so on another body, too.
I've got a Sigma 24-70/2.8 HSM, and it's tack sharp, and it's made me very thankful that I didn't splash out on a CZ2470. A lot of people say the Tamron 17-50/2.8 is also very sharp, but mine seem to produce pictures that looked as if a soft-focus filter was placed in front. So I guess, it all boils down to luck.
For Sigma/Tamron, best if you test it on the spot.
rayalphacanon
New Member
Actually I am looking for 17-70 is also because of the extra reach.. Does anyone knows whr I could test these 2 lens?
Wonder is the new sigma lens still having the same old issue.. Dun seems to find it anywhere yet..
Galdor
Senior Member
If it's the reach that you want, I would recommend the Sony 16-105mm which is a very good lens also although there is no SAM or SSM.
rayalphacanon
New Member
Finally i have decided on tamron 17-50.. tested shots in MS colour together and i do agree tamron is sharp
and the best thing is we alpha users dont hv to pay extra $300 for stabilizer, unlike Canon and Nikon camp :bsmilie:
rayalphacanon
New Member
Haha I agreed... Canon n nikon w/o stabilizer is really a bad thing.. Hmm so wads the difference btw lens stabilizer n in body ones?
one is free the other cost a shitload of money :bsmilie:
Performance wise no diff in reality. Take a look at the previous page, the youtube video i posted.
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