i will have to see them in real life,
because i simply cant decide between these two.

thanks,

Shay

hi,

i want to buy a tele-zoom for my K100D.
i would like as much zoom as possible (animals & birds)
and i want to have fast focus !

important note, if AF or SR will not work in some cases, please point it, because i like to have them.

another important note, i looked at my pictures, and with the 50-200 i am using almost just the 200mm !!!
so this is the reason i want bigger zoom

currently i have 18-55 & 50-200 & TC tamron 1.4x

my thoughts were -

Sigma 100-300 F4,
this way i will have 100-300 with the best quality
with the TC 1.4 i will have a very good quality at 420mm F5.6 (i assume that TC will lower the quality),
people say that the SR will not work so good, because the camera doesn't know that i attached TC.

and now... lets talk about bigma (50-500 F4.0-6.3)
it's heavy ! i am afraid from it !
but 50-500mm... tempting

but if you will say that 100-300 is so much better, and with TC, it will still be better, then there is no issue.

please help...

thanks !

Shay