Go Back   Steve's Digicams Forums > Digital SLR and Interchangeable Lens Cameras > Sigma dSLR

Thread Tools Search this Thread
Old Dec 2, 2012, 4:30 PM   #1
Senior Member
nitti48's Avatar
Join Date: Aug 2009
Location: Buffalo NY
Posts: 116
Default Sigma 17-50 2.8 OS Or Sigma 17-70 2.8 OS

Interested in these lens..Anyone comment on both..I see the 17-70 2.8 OS for Nikon is a tad cheaper..Always looking for the best bang for my buck...Thanks
nitti48 is offline   Reply With Quote
Sponsored Links
Old Dec 17, 2012, 4:42 AM   #2
Senior Member
TCav's Avatar
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,691

The "Sigma 17-70 2.8 OS" is actually the Sigma 17-70/2.8-4. It's a variable aperture zoom lens, having a maximum apertrue of f/2.8 at 17mm, but f/4.0 at 50-70mm. The 17-70 has less CA, but where their ranges overlap, the 17-50 is sharper. Also, the 17-70 has a magnification ratio of 1:2.7, while the 17-50 only goes to 1:5.

On the face of it, they seem to be very similar lenses, but the devil is in the details.

BTW, This is the Sigma dSLR forum. Do you have a Sigma dSLR or a Nikon dSLR?
  • The lens is the thing.
  • 'Full Frame' is the new 'Medium Format'.
  • "One good test is worth a thousand expert opinions." - Tex Johnston, Boeing 707 test pilot.
TCav is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -5. The time now is 10:43 AM.