Go Back   Steve's Digicams Forums > Digital SLR and Interchangeable Lens Cameras > Sony Alpha dSLR / Konica Minolta dSLR, Sony SLT

Reply
 
Thread Tools Search this Thread
Old Aug 13, 2007, 1:40 PM   #1
Junior Member
 
Join Date: Mar 2006
Posts: 11
Default

I have two Maxxum 7D cameras and I'm considering a choice between the Sony 11-18mm and the Sigma 12-25mm wideangle lenses. Both get reasonable reviews from Popular Photography although the Sigma lens was not sharp at the corners. This is possibly due to the fact that it has a wider image field and is suitable for full-frame 35mm sensors while the Sony is limited to APS-C size sensors. Optically I'm leaning towards the Sony lens, but I'm concerned about investing in a lens and then having Sony come out with a full-frame sensor digital camera line in the future, rendering the lens useless.

Any opinions on these two lenses from those that have used them on their digital cameras? Thanks.
Jeffery Small is offline   Reply With Quote
Sponsored Links
Old Aug 13, 2007, 7:13 PM   #2
Senior Member
 
Join Date: Nov 2006
Posts: 323
Default

Did you check the user reviews at:

http://www.dyxum.com/lenses/results.asp?IDLensType=3

It looks like the Signa gets a slightly better score than the Sony.
FrankD is offline   Reply With Quote
Old Aug 13, 2007, 10:22 PM   #3
NHL
Senior Member
 
NHL's Avatar
 
Join Date: Jun 2002
Location: 39.18776, -77.311353333333
Posts: 11,547
Default

This is a hard choice: An APS-C lens always benefits from the better MTF (contrast/sharpness) due to it inherent design, but the full-frame Sigma 12-24 is unique in that it has the lowest linear distortion (horizontal/vertical lines) in its class...
NHL is offline   Reply With Quote
Old Aug 14, 2007, 11:41 AM   #4
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,572
Default

Jeffery Small wrote:
Quote:
I have two Maxxum 7D cameras and I'm considering a choice between the Sony 11-18mm and the Sigma 12-25mm wideangle lenses. Both get reasonable reviews from Popular Photography although the Sigma lens was not sharp at the corners. This is possibly due to the fact that it has a wider image field and is suitable for full-frame 35mm sensors while the Sony is limited to APS-C size sensors. Optically I'm leaning towards the Sony lens, but I'm concerned about investing in a lens and then having Sony come out with a full-frame sensor digital camera line in the future, rendering the lens useless.

Any opinions on these two lenses from those that have used them on their digital cameras? Thanks.
First, the Sigma is a lot heavier (just in case that makes a difference.)

Second, the Sigma is almost a full f-stop brighter (just in case that makes any difference.)

Third, if Sony introduces a full frame dSLR, it will be priced accordingly. If you don't think you'd be willing to spend more than $2,500 for a single camera body, don't worry about the Sony 11-18 being rendered useless. (And if you thought you might want a full frame dSLR, and the >$2,500 price tag isn't an issue, why don't you have one already?)

TCav is offline   Reply With Quote
Old Aug 14, 2007, 12:43 PM   #5
Junior Member
 
Join Date: Mar 2006
Posts: 11
Default

Frank:

Thanks for reminding me about the lens reviews at Dyxum.com. I had visited this site over a year ago but had forgotten about it, so I appreciate being reminded.


TCav:

You say the Sigma lens is a full stop brighter. Both lenses are F4.5-5.6. Was this just a mistake or are you saying that the format factor of the lenses has some additional bearing upon these numbers?

Regards,
--
Jeff
Jeffery Small is offline   Reply With Quote
Old Aug 14, 2007, 1:14 PM   #6
Junior Member
 
Join Date: Mar 2006
Posts: 11
Default

Regarding the Sony 11-18mm lens, can you add a filter without getting vingnetting? Can a standard thickness UV filter be used that will receive the lens cap or will a thin filter work but preclude the use of the lens cap?
Jeffery Small is offline   Reply With Quote
Old Aug 15, 2007, 11:56 AM   #7
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,572
Default

Jeffery Small wrote:
Quote:
You say the Sigma lens is a full stop brighter. Both lenses are F4.5-5.6. Was this just a mistake or are you saying that the format factor of the lenses has some additional bearing upon these numbers?
Sorry. You're right. I was looking at the spec sheet on the Sony website. It shows the aperture to be f/5.5-5.6, but the photo of the lens shows the aperture to be f/4.5-5.6.
TCav is offline   Reply With Quote
Old Aug 17, 2007, 8:54 PM   #8
Senior Member
 
Join Date: Nov 2006
Posts: 323
Default

Here's a similar discussion for your reference:

http://www.dyxum.com/dforum/forum_po...=185524#185524
FrankD is offline   Reply With Quote
Old Aug 18, 2007, 1:56 PM   #9
Junior Member
 
Join Date: Mar 2006
Posts: 11
Default

Frank:

Thanks for the link to the other discussion. I did find a review of the Tameron 11-18mm lens that said that a standard thickness UV filter could be used on the lens without creating any vignetting.

Regards,
--
Jeff
Jeffery Small is offline   Reply With Quote
 
Reply


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 4:38 AM.