« on: January 07, 2015, 12:30:57 PM »
Hi,I don't think it's motion blur - just softness from the lens+extender combo. It matches Brian's results from The Digital Picture. The 2x isn't ideal for most lenses and it looks like the new 100-400 is (sadly) no exception.
Thanks for the further comments. I'll try weights cos it is a metal tripod (Benro) with an Induro BHD 1 ball head.
I am getting strange results - attached two pics of a stone wall and both are pretty sharp, one using the extender and the other the basic lens. Cropped the 400mm pic to give the same field of view as the 800. Both shot at 1/25sec!!! and no camera shake and my previous moon pics were 1/800sec for the 800mm and 1/250sec for 400mm yet the fast shutter speed for the moon gives a blurred image. So not sure the source of my problem is vibration. Really confused why I can't get a decent focus at infinity (ie the moon) when these two pics indicate the combo is not bad.
I am not sure what the root cause is here.... It's complicated as some would say, it depends!
I have the RRS 3 tripod with the fitting RRS gimbal and when trying the 300-2.8 with 1.4 - well balanced - across the valley where I live, it was VERY sensitive to wind and the platform I was on (a balcony) - then the 100-400 II with and without 1.4... Same experience.
My experience is that when using 10x you get an idea of how the pict will look - watching wind - and leaving time for the IS to engage makes the world of difference. Assuming cable or camRanger or remote is in use.
It honestly felt a bit like a sharpshooter must feel when doing their training.