Rumors > Lenses
Help with event lens ( weddings, anniversary's, etc)
Chris Burch:
--- Quote from: dppaskewitz on April 30, 2012, 04:18:19 PM ---
At least one observer thinks the 24-105 is parfocal:
Quote from The Digital Picture review: "The 24-105 L is deemed a parfocal lens - "There's a cam inside the 24-105mm lens that is designed to maintain an accurate focus when the lens is zoomed from tele towards wide." [Chuck Westfall, Canon USA] Though the image remains mostly in focus during focal length change, it is best to focus at the desired focal length."
But I'm not sure whether being "deemed" parfocal is the same as actually being parfocal?
--- End quote ---
Well when I got my 24-105, I locked focus at the wide end, zoomed in and it was significantly off focus...like unusably off. Took me about 3 seconds to verify. From my digging around on the internet, I came across an article that said there are only a few lenses that Canon actually admits to being parfocal. Here is a link, but I can also vouch for the 24-70 as maintaining focus over the zoom range.
http://www.lensrentals.com/blog/2011/02/photo-lenses-for-video/4
Tcapp:
--- Quote from: Chris Burch on May 03, 2012, 11:03:15 AM ---
--- Quote from: dppaskewitz on April 30, 2012, 04:18:19 PM ---
At least one observer thinks the 24-105 is parfocal:
Quote from The Digital Picture review: "The 24-105 L is deemed a parfocal lens - "There's a cam inside the 24-105mm lens that is designed to maintain an accurate focus when the lens is zoomed from tele towards wide." [Chuck Westfall, Canon USA] Though the image remains mostly in focus during focal length change, it is best to focus at the desired focal length."
But I'm not sure whether being "deemed" parfocal is the same as actually being parfocal?
--- End quote ---
Well when I got my 24-105, I locked focus at the wide end, zoomed in and it was significantly off focus...like unusably off. Took me about 3 seconds to verify. From my digging around on the internet, I came across an article that said there are only a few lenses that Canon actually admits to being parfocal. Here is a link, but I can also vouch for the 24-70 as maintaining focus over the zoom range.
http://www.lensrentals.com/blog/2011/02/photo-lenses-for-video/4
--- End quote ---
I used to use the 24-70 as if it were parfocal. I never had issues.
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