Go Back   Steve's Digicams Forums > Digital SLR and Interchangeable Lens Cameras > Canon Lenses

Reply
 
Thread Tools Search this Thread
Old Jun 3, 2005, 2:54 PM   #11
NHL
Senior Member
 
NHL's Avatar
 
Join Date: Jun 2002
Location: 39.18776, -77.311353333333
Posts: 11,547
Default

Hards80 wrote:
Quote:
i don't know why everyone is so quick to dismiss the tokina 12-24 F4.0... it offers a constant f4.0 and compares optically with anything out there..
There's nothing against it - just that you can get the Sigma 12-24 EX which is HSM for not that much more (retail and not listed)... Plus the Sigma is a full-frame so you're getting substantial more glass for the price (also most WA shots - would 'want' a full frame for more details) - I collect cameras so there's all the more reason for me :lol:

I agree with peripatetic that the MTF looks a lot better on the Canon, but it'll all depends on how Sigma will price their's
(There's also no drop-off with the 12-24 EX since only the best center part of the image is kept)
FYI - http://etischer.com/300d/sigma12mm.html


BTW when pitted against similar full-frame WA primes all theses zooms are stellar in comparison!

EF 20mm f2.8 USM:
NHL is offline   Reply With Quote
Old Jun 3, 2005, 5:02 PM   #12
Super Moderator
 
Hards80's Avatar
 
Join Date: Nov 2004
Location: Cleveland, OH
Posts: 9,046
Default

NHL,

you have the 12-24 correct? have you had any issues when using the flash? i have not heard of this until reading your link..

best regards, dustin
Hards80 is offline   Reply With Quote
Old Jun 3, 2005, 5:57 PM   #13
NHL
Senior Member
 
NHL's Avatar
 
Join Date: Jun 2002
Location: 39.18776, -77.311353333333
Posts: 11,547
Default

Hards80

1. The 12-24 is mostly an outdoor lens
2. A direct flash can't possibly cover 12mm wide
3. In the linked posted picture (4th down) the flash worked just fine when bounced
4. The lens does not do the focus, but the camera does -> it seems to me like there's an issue with the camera interacting with the 420EX focusing beam - This is very large lens, it could obstruct the AF beam up close (like in the example) :?
With the internal flash there's no AF beam, but the tiny flash pulses @ high rate to illuminate the subject instead hence no problem there...
NHL is offline   Reply With Quote
Old Jun 4, 2005, 2:24 AM   #14
Super Moderator
 
peripatetic's Avatar
 
Join Date: Nov 2004
Posts: 3,599
Default

Hards80 wrote:
Quote:
i don't know why everyone is so quick to dismiss the tokina 12-24 F4.0... it offers a constant f4.0 and compares optically with anything out there..

http://www.popphoto.com/article.asp?...rticle_id=1349

best regards, dustin
No previous data - thanks for the link :-)

But it doesn't seem to be available from any of the major UK website stores.
peripatetic is offline   Reply With Quote
Old Jun 4, 2005, 2:36 AM   #15
Super Moderator
 
peripatetic's Avatar
 
Join Date: Nov 2004
Posts: 3,599
Default

NHL wrote:
Quote:
Hards80

1. The 12-24 is mostly an outdoor lens
2. A direct flash can't possibly cover 12mm wide
3. In the linked posted picture (4th down) the flash worked just fine when bounced
4. The lens does not do the focus, but the camera does -> it seems to me like there's an issue with the camera interacting with the 420EX focusing beam - This is very large lens, it could obstruct the AF beam up close (like in the example) :?
With the internal flash there's no AF beam, but the tiny flash pulses @ high rate to illuminate the subject instead hence no problem there...
And of course all this is a reason to go for the 10-22 if you don't need the full frame. If you do need full frame of course there's nothing else like it, the Sigma is in a class of its own!!

The 10-22 is nearly a full stop faster across the range, is a bit wider angle and even 2mm is fairly significant at this end of the spectrum, and quite a lot smaller and lighter. And it's not that much cheaper either £450 in the UK v £550 for the 10-22.

And although only the centre of the image is used the MTF of the 12-24 isn't great by comparison, this is nearly a whole stop slower than the 10-22's chart.

It's at this super-wide angle that the S lenses really can shine.

Attached Images
 
peripatetic is offline   Reply With Quote
Old Jun 4, 2005, 6:40 AM   #16
NHL
Senior Member
 
NHL's Avatar
 
Join Date: Jun 2002
Location: 39.18776, -77.311353333333
Posts: 11,547
Default

peripatetic

I totally agree... However the EF-S 10-22 only fits a few bodies - It won't fit on my 10D for one (and many others in my collection)

By default the next best is the Sigma 12-24 EX which "is in a class of its own"
FYI - http://www.trekearth.com/photos.php?cat=lens&id=2328
NHL is offline   Reply With Quote
Old Jun 5, 2005, 5:36 AM   #17
Super Moderator
 
peripatetic's Avatar
 
Join Date: Nov 2004
Posts: 3,599
Default

These super-wides are one place where I'd really like to see the Sigma MTF charts at f8.

To me super wide usually goes with small apertures (and tripod if necessary) to get maximum DOF.

The 10-22mm chart at f8 is very impressive, but how can we tell if the Sigmas are comparable?! Frankly if they are close at f8-f11 I would be much less tempted by the better performance of the Canon at wider apertures.
peripatetic is offline   Reply With Quote
Old Jun 5, 2005, 7:12 AM   #18
NHL
Senior Member
 
NHL's Avatar
 
Join Date: Jun 2002
Location: 39.18776, -77.311353333333
Posts: 11,547
Default

peripatetic

I think you're right, the MTF only get better when closed down, but no one knows if they can match the EF-S 10-22... CA is the other thing that we should both watch for which are not measured by theses charts
NHL is offline   Reply With Quote
Old Jun 5, 2005, 11:16 AM   #19
Junior Member
 
Join Date: Jun 2005
Posts: 4
Default

Thankyou everyone,

The response and input has been very helpful, albiet a bit over my head at times. That is one of the wonderful things about photography, always more to learn and expierence.

My best to all, Keith
chefkeithb 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 3:54 PM.