Whoop From Spain, joined Jun 2001, 45 posts, RR: 0 Posted (8 years 9 months 4 weeks 1 day 22 hours ago) and read 3150 times:
I've owned a Canon EOS D60, then a 10D and finally I presently own a 20D
With the 10D I had some focusing problems, or at least I thought they were focusing problems....
The problem is that in certain circumstances I still have the same problem with the output images.
Problem is that with the 10D and a canon plastic kit lens, the 75-300, I used to get a "double edge" effect, or "halos", specially whe used at 300 mm. When I upgraded I got a Canon 100-400 IS L and though that I was going to get rid of the problem, never so far.
Options are: the camera and any long lens behave like this in some circumstances (cloudy days with contrast problems) or in the other hand I am doing something wrong.
Hera are 2 examples I took this weekend in an airshow:
100% crop, equiment mentioned above, ISO 200, 1/1600, f8.0, lens is at 400mm end, Tiffen protection filter, IS on.
Note the white cross on the tail of the aircraft, see the double edge o border? notice also the horizontal stabilizer, same effect.
Same data as on the previous one. Note the numbers on the tail. It shoud read C15 - 36, well, I read C115 - 316, there are a couple of extra ones there thanks to my "double border" effect (noticeable in other parts of the pic, like the logo below thwe numbers)
Does this happen to any of you 20D/100-400 IS L users out there?
Jran225 From United States of America, joined May 2004, 308 posts, RR: 7
Reply 2, posted (8 years 9 months 4 weeks 1 day 22 hours ago) and read 3110 times:
I can only think of two possible causes for your "double border" effect:
It could just be that there is too much camera shake to produce a pin-sharp image. I just came back from an airshow and in some of my shots (particulary in those of high-speed passes) I found the exact same effect. I too thought that a 100-400L IS would correct that to some extent, but on those types of shots, motion blur will always be an issue - no matter what camera/lens combination you use!
It might be that the filter is causing some sort of deflection of the light entering the lens, which would give you the same distorted results. This is unlikely, but very possible if the filter is not attached properly or is dirty/scratched.
I would suggest experimenting with different camera configurations and shooting conditions. For instance, try taking photos with and without the filter attached. Then try taking still photos, photos of slow-moving aircraft and finally photos of those fast airshow demonstrations and compare the results. If the problem persists, you might want to take the camera down to your local camera store to see whether they might be able to assist you further....either way, good luck and happy shooting!
Never tell your girlfriend about all the 'action' you're getting at the airport - only photogs understand that.
IL76 From Netherlands, joined Jan 2004, 2236 posts, RR: 50
Reply 4, posted (8 years 9 months 4 weeks 7 hours ago) and read 3004 times:
I don't think this has anything to do with the camera attached to the lens. Looks like a simple case of motion blur to me and Florian's explanation also sounds very plausible. The IS probably lags behind in a stick-slip movement on very fast subjects causing it to 'see double'.
Javibi From Spain, joined Oct 2004, 1371 posts, RR: 43
Reply 5, posted (8 years 9 months 4 weeks 3 hours ago) and read 2966 times:
Ivan, I do get LOTS of blurry shots like your examples, but I am shooting most of the time 1/30 or 1/60 exposure!
Seriously, you know I have the same combo, but I did not notice any particular focusing problems in the rare occasions I use fast speeds. I am under the impression that as it has been said the problem in those examples is just motion blur, maybe induced by the IS (you are using mode 2, right?).
"Be prepared to engage in constructive debate". Are YOU prepared?
DRAIGONAIR From Netherlands, joined Oct 2000, 708 posts, RR: 6
Reply 10, posted (8 years 9 months 3 weeks 6 days 9 hours ago) and read 2875 times:
I recently too had this problem (300D EF100-400mm)getting some blurry images...but this is due to the fact I was using 400/s with the plane going right by me...should of made it faster! Ah well experimenting is good practice!