EF 24-70 f/4L IS & EF 35 f/2 IS

[TWI by Dustin Abbott]

Re: EF 24-70 f/4L IS & EF 35 f/2 IS

Since My L bags all sit inside my largest L bag in a box, it's a non issue. Hoods are a different matter.

+1 on that. The bags are useless; hoods are not. That being said, I have gotten by with several $5 Ebay special hoods before and it has never been an issue.

 

[tron]

Re: EF 24-70 f/4L IS & EF 35 f/2 IS

Question - when you need fast SS to freeze action is it better to switch IS off? Does it get in the way? I usually just leave my IS on all the time, should i switch it off if my SS is 1/focal length, crop factor adjusted?

Say you were to shoot a landscape at 1/200s at 24mm (obviously don't need IS) but is is there any reason why I should switch it off? Assume I have no tripod.

At what point does IS have a noticeable effect? Like what is the threshold?

Good questions - I asked the same one some time ago and no one came up with a conclusive answer. My 2 cents for handheld (for tripod turn IS off and mlu on esp. for longer exposure times):

At very high shutter speeds turn IS off because the vibration might decrease iq (also see here: http://www.canonrumors.com/forum/index.php?topic=10781.0). For other higher shutter speeds turn it off unless you require the stabilized viewfinder to track an object or set the af point just where you want it. Another reason for turning off IS when it's not really required is simply that it doesn't wear down that way - Canon doesn't give us a 6 year warranty like Tamron :-o

Personally I think IS is unnecessary @ 1-2 stops faster than 1/(focal lenght * crop factor).

hello,

I turn IS off when I use tripod. You see once I used my 70-200 f/4 L IS in a very steady tripod, mirror lock, 2 sec delay. The speed was 30sec. I got an extremely blurry picture!!! I begun to getting confused, angry, etc when it downed on me to turn IS off. Bingo. Pictures were very sharp afterwards! Then I read at the lens' instructions that IS has to be off when the camera is in B mode. Well it was in Av mode but as the speed was 30sec I guess the instruction was close enough.

 

[tron]

Re: EF 24-70 f/4L IS & EF 35 f/2 IS

By the way, thanks for the reference to high speed SS in conjunction with IS. I remembered I had read it in the past but to tell the truth I had forgotten...