SL2 IBIS and long lenses

[jamesdak2]

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Fairly new to the SL system after decades shooting Canon DSLRs.  I have a very large number of old manual focus glass that I use adapted on my various camera bodies.  Now this includes both a SL (type 601) and a SL2.   I scored some adapters for cheap locally and one was a EF-L adapter.  For fun I did some test shooting of both my Canon EF 400/5.6L and my 600/4.0 L on the SL2 and got sharp images.  But yesterday in the field I was shooting with the 400/5.6 on the SL2 and quite frankly the majority of the images were soft.  Now it's been awhile since I've shot birds and I'm sure my technique was off a bit.  But still with hawks/Owls  about 10 yards away I should have gotten better shots.  This was at a bird refuge so most shots from the car but either resting my lens on the window or on a beanbag.  I'm wondering if IBIS was the problem more than me?  I had it turned on with a generic 400mm lens selected for the profile.  Yet my shutter speeds were high enough to not need IBIS or even support.  Usually above 1/1000th  and shooting stepped down a stop or two.  Just curious what experienced shooters with the SL2 think.  These were static shots of perched birds so nothing really technically hard to shoot.  In fact, I was not that careful because I thought I had all bases covered with the support, DOF and shutter speed.  I was surprised to get home and see so many soft results.  

The included shot is one a few that was acceptable.  And it was shot at a slower 1/500th at f6.3.  I was using AFs with spot focus and electronic shutter.  Maybe give the facial/eye recognition a try?  

I really wonder if IBIS in this situation was the issue?  I thought I read on here somewhere that's it's not good for anything more than 100mm yet I can select a generic lens profile all the way up to 400.  Of course it could just be me, I am rusty and maybe I was moving more than I realized. 

Planning to go back out tomorrow to test again.  Heck, even some test shots last month with my 180/3.4 APO R and a 2X teleconverter turned out sharp.

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[jaapv]

IBIS never works on long lenses. The sensor movement would be too excessive. Long lenses rely on OIS. The only exception is 5-axis stabilization which uses the rotation component of IBIS. I think that you are seeing shutter shock. Long lenses require Electronic Shutter at any shutter speed. On a tripod or bean bag it is best to switch off stabilization which is meant for handheld shots ( or panning if your lens offers the option in OIS). 

[BernardC]

Which EOS adapter did you use? As far as I know, there aren't any electronic EOS adapters that work on both cameras (SL and SL2). The old Novoflex adapter worked on the SL, but it doesn't work with later cameras. Sigma's adapter is recommended on the SL2/SL3, but it isn't compatible with the SL. Other adapters are available, but their compatibility is limited as well. I wonder if you got into a situation where the lens' OIS was enabled, but the camera body was unaware of that and added it's own IBIS to the mix.