I do not understand ? If a telephoto zoom lens rated f4-6.3 wont autofocus if connected to a camera with a 2x converter why a lens stopped down to f22 will autofocus?
I've purchased an excellent condition Canon F1N off Ebay; and have bought several lenses for it. I think one lens may be a counterfeit (the lens does not have threads on it which will accept a 55mm filter). Where do I go to verify the authenicity of ...
Canon lens 28-105mm attached to 5dmarkiii body will not always work in auto focus mode. I think I can occasionally get it to work in alfocus but even in manual the lens occasionally won't register focused objects. Do I have a problem with the lens or...
hi there!i need pro advise on comparing 2 lenses as follow:ef-s 10-18mm f.4.5 IS STM VS ef-s 10-22mm f3.5-4.5 USMsharpness of corners on 10-22outdoor clearance seems equal 10-18 has IS but much cheaper10-22 has metal mount and 10-18 plasticetc...but ...
I shoot high school basketball games in small low lit gyms. I use the Canon D70 with the Canon EF-S 18-200mm f/3.5-5.6 IS. This takes good pictures but I want sharper picture quality. I need a fast lense!! I have been looking at the Canon 70-200 f...
Hey photo people! I'm looking into buying the Canon 70D but I can't decide on what lens to purchase with the camera or if I should stick with the lens that comes in the kit. This is my first "fancy" camera purchase so it's a little challenging for me...
My lens has developed speckling on the underside of the front glass; it resembles dust in pictures, especially when the aperture is narrowed, but is inside the lens and doesnt appear to shift. I've had it for only 3 years and always used a UV filter....
I'd like to use a Canon EOS lens with an astronomical CCD camera to do some non-astronomical imaging. This project requires the ability to change the lens aperture to deepen the field of view. I've heard that the aperture can be set by connecting t...
What is the EOS Lens Registration Tool? I suspect it was part of a recent upgrade to my Canon software. When activated, it will not launch and said my XSi camera is not recognized. The EOS Utility does recognize the camera. Is it for a full frame o...
I am a new owner of a Cannon 60D w/ a kit 18-135 lens. I would apprecaite recommendations for a portrait lens. Thanks!
i just bought my first dslr, and i was wondering what are the major risks buying used lenses ?
Does anyone have some good reference/reading material that you can share with me, I would like to experiement with filters. Ive googled some stuff but did not find strong material. Any help on this would be greatly appreciated.
Hi. From what I see on other forums, the push-pull design of the 100-400L v1 is popular. I know I prefer it to twist zoom. If it is even possible, I wonder if there is any profit for Canon to fabricate a conversion kit to be installed by a Canon ser...
