aviation photography - 135L w/ 2x TC

using the 135L for candids, I've just recently got back my aviation photography enthusiasm - I used to shoot w/ 300 f4...70-200 etc...

keeping in mind that I got a f2 lens...and superior quality...I thought of adding the 2x tc for aviation photography and shoot at f4 - stopping down to 5.6 or f8 is intended -

any experiences/ advice?
the reason not to get a lens just for aviation photography? besides the fact that most of my semi pro works involves portraiture and still life... I'm not intending to put some extra weight for occassional aviation photography w/ me....yet still get pics to pages like jetphotos.net or airliners.net again (got a 85L shot there too...^^)
adding a 2tc would be a great deal here -

any advice / experiences made w/ the 135 2x combo?
thx in advance

I cannot comment on how it works for aviation photography but can tell you that it is a fantastic combo-- the 135L is an under used lens that really is fantastic. I know people who use the 135L and 1.4 for surfing photography vs the 300 -- I am told much more portable and the photos are exceptional.

The 135f2 is a good lens but will not be long enough even with a 2X on.

Agreed, even though the 135/2 is a great lens and takes a 1.4x TC very well, the results with a 2X are only so-so and, not long enough.

No where near as long as you need for aviation! I mean you could crop and stuff, but might as well get the right lens for the job!

Good luck!

I think you need to define "aviation photography" a bit further. For airshows, the 100-400 is just about perfect. For static, ground photography (also "aviation photography") what you mention will work as will many other combinations.