I'm aware that this is somewhat a technical problem, but anyone out there experienced the same. I think that I've tried it all all different programmes, different distance setting, AF or MF, stabilizer on/off, manually setting focus and no problem with my other lenses. When I point the camera downwards the clicking/hunting stops and when I bring the camera back to horisontal, no clicking until I half press the trigger, and it starts again. It's still clicking while the camera is cleaning the sensor. I sounds like someone castagnettes in a certain rythm four clicks, 1. When I turn on the camera, 5D III, the lens immediately starts hunting/clicking, and when I say hunting, I mean hunting. I've read some of the previous threads regarding issues with autofocusing on this particular lens, but I think that my problem is somewhat different. The impression I got from previous posts below was that the only way to effectively focus with the Canon 20D was in using the autofocus, and that there was inherent advantage in using AF Canon lenses with this body as opposed to manually focussed R lenses.Hi. Where in the Canon literature does it say that there is a close focus limit to AF? "While looking through the viewfinder and framing the subject, focus with the AF or MF mode" Voudouris - Maybe you should read the manual that came with the Canon lens: I admit its not a critical test, but it should not produce a bias toward the Leica lens either. The images were taken back to back and compared with the LCD viewer (10x magnified) on the camera. Same is true if the test was not capable in resolving any difference. If the lenses were so close in performance, I should not have seen any difference in the images. Mendenhall- Ever hear of a colloquialism? Perhaps I should have said "My confidence was restored." Not every test has be carried out in an optics lab. Its just not quite as sharp as the Leica. I don't consider the Canon lens to be "junk". I went back and measured the speed loss of both lenses at the 1:3 magnification (which is the limit for the Leica), and both lenses loose 1 stop. So I do not consider the Leica exorbitantly priced. Of course the Leica was used, but in mint condition. The Canon lens cost me about the same as the Leica lens. Have read about superior Canon optics (particularly telephoto lenses) My faith in R optics is restored, and feedback I In an earlier post about R lenses being impossible to focus on theĢ0D were incorrect. These tests clarified a number of things for me. And remember, this is the manually focussed image beingĬompared to the auto-focussed Canon image. Magnification showed the Leica to be sharper, cleaner, with betterĬontrast. One of the circuitĬomponents I was shooting (which is about 0.2" x 0.3") has ID numbers Not super critical,īut I still found the R lens somewhat sharper. Think you can get a 10x magnification this way. Sections of both images via the viewer LCD on the back of the 20D. Tried to compare sharpness of both images. All body settings were identical for both lenses. The Leica R lens, produced white whites with Orange tinted image (large, fine) with no white balance correctionsĪpplied (AWB engaged). I made a couple comparison shots at 1:4 with both macro lenses underįlourecsent light, ISO 1600. Lenses from 180mm F2.8 to 24mm, and I had no focus problems Theĭigital images manually focused (R lens) were as accurate as ones I had no trouble focussing, even stopped down 2 or 3 stops. I tested the focus accuracy (meaning image sharpness) at macro levels F4 at infinity, f4 at the close focus endpoint,Īnd R lens is now faster for macro work than the Canon. The Leica R lens, of course,ĭoes no such thing. This makes this lensĮffectively f5.6 at near focus points. Shutter speed is fixed for a proper exposure at infinity, focusing toĬlose focus drops the exposure by 2 stops. The manual, and I confirmed it by placing a neutral grey card inįront of the lens, and adjusting the focus from infinity to theĬlosest focus point, with manual exposure mode on the 20D. But the F-stop reading in theįinder does not change from f2.8! What a con! This is mentioned in First thing I found out was that the Canon lens Leica lens underperform in comparison to the faster, more modernĬanon lens, which is optimized for the 20D body, yadda yadda yadda.īoy was I surprised. I fully expected, before the tests, no to see any apprecableĭifference between these lenses. Using a Photodiox adapter on the 20D body. Took some macro comparison shots with my Leica 100mm F4 Macro Elmar R One thing I was curious about was the focus issue with R lenses, so I I just got my new Canon 20D body and 100mm f2.8 EF USM Canon lens.
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