After working with the EOS-1V for a while, I have noticed that the “ai-servo”autofocus of the camera is not working well in combination with “not IS-lenses”. This results in many pictures which are “out of focus”. (the camera works well with IS-lenses) Because this can be noticed while you are looking through the viewfinder, most of the time I also make a part of my pictures (similar chances) with an EOS-1N, which are all in-focus.

By me, the problem occurs with the EOS-1V in combination with the: EF 70-200 2.8L USM, EF 300mm 2.8L USM and EF 400mm 2.8L USM II. (these lenses are working fine on an EOS-1N !)

Please do the following test to check if your EOS-1V is having the same problem:

1.select the “ai-servo” AF mode; 2.select the centre focusing point; 3.place a flat object with enough contrast at some distance in front of your camera; 4.aim the sensor at the object and press the shutter button halfway to focus the object. keep the shutter button pressed halfway for a while; 5.now you can see the autofocus reacting very unreliable (the lens constantly focuses as if the subject is moving toward or away from the camera, while it isn’t moving at all. Even if you move the camera toward or away from the subject, the autofocus is still reacting unreliable. 6.when you also have an EOS-1N, repeat the test with this camera and compare!! You will see that the EOS-1N is focusing much better!

By me, the problem is most visible with the combination EOS-1V and EF70-200mm 2.8 USM at 70 mm.

After doing this test with more EOS-1V’s I noticed that they all had the same problem. That’s why I have the following question:

Do you recognize this problem or do you have a solution for it?

At this moment, I’m in contact with Canon and my dealer in order to find a solution. When you are having the same problem, please let me know by sending an e-mail with your experience to: m.akkermans@mdi.rws.minvenw.nl Then, I will keep you personely informed as soon as I know more.

Best regards, Martijn

-- Martijn (m.akkermans@mdi.rws.minvenw.nl), April 03, 2002

Answers

i guess no one on this forum seems to have an eos-1v.

-- Jeff Nakayama (moonduck22@hotmail.com), April 10, 2002.