Hi Martijn I have not tried your test, but I don't think that it proves anything. I have the 1V, and as far as I understand it, the way that the AI focus works is to continually evaluate the focussing. The way that I assume it will do that is to make continuous small adjustments to determine maximum contrast. This will take place with the shutter button half pressed. Focus is only locked immediatley prior to shutter release, and not with the shutter button pressed halfway. I think that this invalidates your test.
It is interesting that you have the problem with non-IS lenses. Do you have the problem with IS lenses, when IS is turned off? If you can't answer no to this question, is it possible that you are confusing out of focus with camera shake? Is there some part of the image that is in sharp focus? If the answer to this is no, then it could be camera shake, which an IS lens could very well eliminate. AFAIK, there was a problem with some of the early 1Vs where focus was achieved slightly behind where it should be, but that has been resolved. Steve. > -----Original Message----- > From: Akkermans, M. (Martijn) [mailto:[EMAIL PROTECTED]] > Sent: 03 April 2002 08:40 > To: '[EMAIL PROTECTED]' > Subject: EOS-1V owners, read this!!!! > > > Hello, > > 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! > * **** ******* *********************************************************** * For list instructions, including unsubscribe, see: * http://www.a1.nl/phomepag/markerink/eos_list.htm ***********************************************************
