I recently bought a 300mm f4 IS and canon 1.4x extender for birding but am having problems getting sharp images when using a tripod (manfrotto 190xprob and 498RC2). This is easily the longest lens I've ever used and I know it'll take some practice so I'm loathe to blame any problems on my gear when it's more than likely my technique thats at fault.
I've tested the lens in optimum conditions (tripod, mlu, cable release etc) and it's fine... more than fine it's great! It's not focusing or the bird moving that's the problem as everything is a tad shakey. I'm used to using my tripod for landscapes with a wide angle lens and cable release or timer not firing the shutter manually on the camera so is this likely to be my technique in which case I'd love some tips or do I need to upgrade to 055 legs with a fancy gimbal head?
Thank in advance from a noob birder
I think I'm going to switch to the Manfrotto 055XPROB because I'm using the tripod at full height more often now and the 190 is a bit too short for me

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