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

Reply
 
Thread Tools Search this Thread
Old Jul 30, 2006, 10:58 AM   #1
NHL
Senior Member
 
NHL's Avatar
 
Join Date: Jun 2002
Location: 39.18776, -77.311353333333
Posts: 11,544
Default

For anyone interested in this lens, it's MTF is now plotted on Photodo: http://www.photodo.com/topic_57.html

-> i.e. kind of interesting to compare theses results against the primes with the 1.4/2x TC's on...
NHL is offline   Reply With Quote
Sponsored Links
Old Jul 31, 2006, 4:18 AM   #2
Junior Member
 
liquidstone's Avatar
 
Join Date: May 2006
Posts: 15
Default

NHL wrote:
Quote:
For anyone interested in this lens, it's MTF is now plotted on Photodo: http://www.photodo.com/topic_57.html

-> i.e. kind of interesting to compare theses results against the primes with the 1.4/2x TC's on...

Nice review! My experience with mine runs parallel to what appear in the graphs.

Here's what this li'l glass can do - 1DM2 + Sigmonster + stacked Sigma TCs, 2263 mm, 100% crop:



Regards,

Romy








liquidstone is offline   Reply With Quote
Old Jul 31, 2006, 8:58 AM   #3
NHL
Senior Member
 
NHL's Avatar
 
Join Date: Jun 2002
Location: 39.18776, -77.311353333333
Posts: 11,544
Default

Nice piece of instrument indeed

If one goes by the plot results from Photodo, this lens is sharpest @ wide open up to 550mm and improves with f/8 @ 800mm which is actually superior to the 400 f/2.8 with a 2x TC (which is best only @ f/16 through f/32) from the same link.
-> IMO this zoom is clearly more useful here at this reach...

... and judging from your results with the incredibly slow shutters I wonder if IS is even really necessary on a tripod
NHL is offline   Reply With Quote
Old Jul 31, 2006, 6:01 PM   #4
Junior Member
 
liquidstone's Avatar
 
Join Date: May 2006
Posts: 15
Default

Yes, the Sigmonster is very sharp wide open from 400 to 700 mm.... it's as sharp as my 500 f4 L IS at 500 mm and 700 mm, at any AV and using the 20D's sensor.

At 800 mm, the Sigmonster is just decent wide open, and returns to prime like sharpness at f/8 (sharpness peaks at f/9 with my copy).

Romy
liquidstone is offline   Reply With Quote
Old Jul 31, 2006, 7:09 PM   #5
Senior Member
 
Caboose's Avatar
 
Join Date: Feb 2005
Posts: 625
Default

Liquidstone,

I just have a quick question for you. When you stack your TC's in which order do you stack them? Which is closest to the camera body? I don't have the 300-800 DG, but looks like a great lens. I was wondering how the stacked TC's will work with other lenses too.
Caboose is offline   Reply With Quote
Old Jul 31, 2006, 8:33 PM   #6
NHL
Senior Member
 
NHL's Avatar
 
Join Date: Jun 2002
Location: 39.18776, -77.311353333333
Posts: 11,544
Default

The Sigma TC's only go 1-way the 2x on top of the 1.4x - It just doesn't fit the other way around! :-)
(the front of the 2x will hit the back of the 1.4x otherwise...)

FYI (from liquidstone) - http://forums.dpreview.com/forums/re...ssage=18284148
NHL is offline   Reply With Quote
Old Jul 31, 2006, 8:48 PM   #7
Senior Member
 
Caboose's Avatar
 
Join Date: Feb 2005
Posts: 625
Default

NHL wrote:
Quote:
The Sigma TC's only go 1-way the 2x on top of the 1.4x - It just doesn't fit the other way around! :-)
(the front of the 2x will hit the back of the 1.4x otherwise...)
Thanks NHL,

I guess I would have figured that out if I would have just tried it.
Caboose 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 5:59 PM.