Tamron 150-600 with a 2X? Anyone have success with this?

[Overread]

Before anyone asks what I am trying to accomplish.. I am not at liberty to say.

If you're trying to spy on peoples windows you'd be better looking for an old WW2 bomber optics setup - now they were sharp and long ranged (also huge).

But honestly I've no idea what kind of project would be so secretive; whilst your area or region might be a general idea of what you're going to do would help - chances are someone here might have worked in a similar situation and have advice to give.

 

[robbins.photo]

Before anyone asks what I am trying to accomplish.. I am not at liberty to say.

If you're trying to spy on peoples windows you'd be better looking for an old WW2 bomber optics setup - now they were sharp and long ranged (also huge).

But honestly I've no idea what kind of project would be so secretive; whilst your area or region might be a general idea of what you're going to do would help - chances are someone here might have worked in a similar situation and have advice to give.

Well, he could tell you, but then he'd have to photograph you...

 

[dinub2015]

I have wanted to try the new Tamron 150-600 with a 2X but have struck out. When I got the lens I was hoping my Canon 2X would work. It didn't since the black inner ring was to long. Then I took the lens to the local Camera shop and tried a Kenko. My Camera got a lens error and we couldn't get it to work either.

Has anyone had any success using a 2X on thier 150-600 Tamron?

So for the record with my 5DmkIII
Kenko = Failure, electronic failure in camera
Canon = Failure do to design length

Please feel free to add your camera brand and success or failure.

Let's understand one basic thing. Most camera won't autofocus when the real aperture they see is higher than let's say f 8.0. but using a 2X teleconverter with a 150-600 /f5-6.3 lens, would render an F10.0 at 300 mm and an f12.6 at 1200 mm setting. That is not autofocus-able, by any camera. I am looking for a Tamron 2x SP teleconverter. But in my knowledge, it would work only in manual focus. BTW the same is valid with the Sigma 150-500 zoom. At Sigma it is specifically explained this point of view.
If Kenko 2x converter fails, that means there is an electronic incompatibility between the converter and the lens. But in my view, Tamron 2X converter should work with a Tamron lens, not on auto focus, but manual.

 

[BillM]

I have advice but I am not at liberty to share it

 

[astroNikon]

I have advice but I am not at liberty to share it

you should have given your advice over a year ago when this thread was actually active.

 

[dinub2015]

I have advice but I am not at liberty to share it

you should have given your advice over a year ago when this thread was actually active.

To me you DON'T KNOW! Blessings! LOL

 

[BillM]

you should have given your advice over a year ago when this thread was actually active.

I switched to decaf, it's really slowed me down