Sigma 300-800mm f/5.6 EX HSM -Sigmonster-

Inspeqtor wrote in post #19166482
Wow Jake! These are both excellent shots!! And stacking two 2.0 TC's are amazing! Hand held or on a tripod? I am thinking tripod because of the weight of the 300-800mm.

I am guessing your TC's are of the Canon brand, although I thought I had read a while back that Canon TC's were also NOT stackable.
When I bought my Sigma 150-600C I bought the 1.4 and 2.0 both Sigma brand but sadly found out those are not stackable.

Of course tripod! And even on a series 4 with a full Wimberley head, @ 3200mm even the slightest vibration made the moon move all over the screen!

The two 2X T-Cons were either one of the OEM Sigma made to go with this lens, or the Canon MKIII, (I can't remember actually, but I think it was the Sigma) and a Canon 2C MkII which was in fact designed to allow stacking. It is the only one that was,. and I kept it for that reason. So any t-Con, 1.4x, or 2x, Canon or Sigma can be stacked behind the Canon MKII.

The only other 2X T-Con that I seem to remember reading was stackable is Kenko, but I might be making that up.

CyberDyneSystems wrote in post #19166489
Of course tripod! And even on a series 4 with a full Wimberley head, @ 3200mm even the slightest vibration made the moon move all over the screen!

The two 2X T-Cons were either one of the OEM Sigma made to go with this lens, or the Canon MKIII, (I can't remember actually, but I think it was the Sigma) and a Canon 2C MkII which was in fact designed to allow stacking. It is the only one that was,. and I kept it for that reason. So any t-Con, 1.4x, or 2x, Canon or Sigma can be stacked behind the Canon MKII.

The only other 2X T-Con that I seem to remember reading was stackable is Kenko, but I might be making that up.

Thank you!

I did own the Kenko's but when I bought the Sigma TC's I gave the Kenko's to goodwill. I know for the price of the Kenko's their quality would not come as close as either Sigma's or Canon's. I sure with I would be able to stack my Sigma's.

CyberDyneSystems wrote in post #19166489
Of course tripod! And even on a series 4 with a full Wimberley head, @ 3200mm even the slightest vibration made the moon move all over the screen!

The two 2X T-Cons were either one of the OEM Sigma made to go with this lens, or the Canon MKIII, (I can't remember actually, but I think it was the Sigma) and a Canon 2C MkII which was in fact designed to allow stacking. It is the only one that was,. and I kept it for that reason. So any t-Con, 1.4x, or 2x, Canon or Sigma can be stacked behind the Canon MKII.

The only other 2X T-Con that I seem to remember reading was stackable is Kenko, but I might be making that up.

If I did find a Canon 2.0 V II are you sure it would stack with my Sigma 2.0?

Inspeqtor wrote in post #19166674
If I did find a Canon 2.0 V II are you sure it would stack with my Sigma 2.0?

Which version SIGMA's do you have? I can only attest to the ones labeled
"APO TELE CONVERTER 1.4x EX DG" and
"APO TELE CONVERTER 2x EX DG"

...that said, it's the rear of the Canon 2X II that makes the differences, it's got a huge gaping hole that looks like it will fit anything comfortably!

CyberDyneSystems wrote in post #19166793
Which version SIGMA's do you have? I can only attest to the ones labeled
"APO TELE CONVERTER 1.4x EX DG" and
"APO TELE CONVERTER 2x EX DG"

...that said, it's the rear of the Canon 2X II that makes the differences, it's got a huge gaping hole that looks like it will fit anything comfortably!

I have the newest Sigma versions:

2.0 = TC-2001
1.4 = TC-1401