New teleconverter.. Few questions

413x · 12 Sep 2014 at 20:11

Got a 1.4x sigma tc for my 120-300mm sigma
It's waiting for me at the DO

With the tc on I loose stops
Will the camera adjust for this or will it still read a max aperture of 2.8?
I will he using it on Sunday (weather permitting) I'm guessing with something so simple there isn't anything else I need to know about?

413x · 12 Sep 2014 at 20:27

Thanks phal

Yeah the AF is the unknown for me.
As this is going to firstly be used at duxford I'm hoping this wont be too much of a problem. I will see
Birds in flight might be harder!

It would be lovely if it means I don't need a 400mm f5.6 despite being so much heavier and probably worse in IQ

413x · 12 Sep 2014 at 20:47

I'll just try it for a bit. I may well be too fussy and not like the results.
When I get back, maybe next weekend, I'll do a crop vs Tc test somehow and see the difference

413x · 14 Sep 2014 at 19:00

Yeah definitely not even going to attempt a 2x