Stacking extenders

[Jay Gould]

If you want to stack a 1.4 and 2x extender on, for example a 300 f/2.8, can you do so; do you need to put an extension tube between the extenders?

If you did this, in what order would you put the extenders: body - 1.4 - 12X - 2.0 or would you reverse the extenders?

Having asked the question, is this something to be considered when using a tripod?

Thanks,

[Magnus Thornberg]

If you want to stack a 1.4 and 2x extender on, for example a 300 f/2.8, can you do so; do you need to put an extension tube between the extenders?

If you did this, in what order would you put the extenders: body - 1.4 - 12X - 2.0 or would you reverse the extenders?

Having asked the question, is this something to be considered when using a tripod?

Thanks,

I have stacked a kenko 1,4x with canon 2x in that order! No problem! I think it´s the same order with canon 1,4x and canon 2x! You don´t need any extension tubes! In good light it will autofokus with my 40D! i stop down to f11 for better sharpness!

/magnus

[Dennis Huff]

If you're stacking Canon extenders, the 2.0x has to go on the lens first as the 1.4x doesn't have a recess to accommodate protruding elements. Also it appears that the camera only reads the extender directly in front of it and the exif won't indicate the effective focal length or aperture. At least that's been my experience.

[Doug Brown]

The Canon 1.4x needs to be attached to the body and the 2x to the lens. No extension tube is required.

[Joe Milmoe]

Doug is right, but a minor note that they must be version II teleconverters. V1's do require the extension tube to serve as a spacer.

Image quality with stacked TC's is going to suffer immensely.

300 is fantastic with the 2x, especially when stopped down a bit.

[Jay Gould]

Doug is right, but a minor note that they must be version II teleconverters. V1's do require the extension tube to serve as a spacer.

Image quality with stacked TC's is going to suffer immensely.

300 is fantastic with the 2x, especially when stopped down a bit.

Hi, you have answered the reason for the second reason for the post!!

I am currently studying (that is the only way to describe it!) Artie's BAA I - I am back in school and loving it. In the section on teleconverters he said that stacking required an extension tube between the converters - obviously quite correct based upon the technology at the time written.

How far down do you step your 300 when using the 2X?

Cheers, Jay

[Magnus Thornberg]

Hi, you have answered the reason for the second reason for the post!!

I am currently studying (that is the only way to describe it!) Artie's BAA I - I am back in school and loving it. In the section on teleconverters he said that stacking required an extension tube between the converters - obviously quite correct based upon the technology at the time written.

How far down do you step your 300 when using the 2X?

Cheers, Jay

I´m not Joe but i can write my thoughts anyway:) I prefer to stop down to f8 but i use f6.3 most of the time! I have found that the sharpness get mutch better with f6.3 then f5.6!

Sorry if my English sucks...i think you undestand me anyway:)
/M

[Jay Gould]

I´m not Joe but i can write my thoughts anyway:) I prefer to stop down to f8 but i use f6.3 most of the time! I have found that the sharpness get mutch better with f6.3 then f5.6!

Sorry if my English sucks...i think you undestand me anyway:)
/M

Mate, you English is just fine! Don't put yourself down; you play on the BPN and that makes you exceptional. ;):D

[Ed Cordes]

I too have used stacked extenders on my 500 f4 - very carefully. 1.4 on body and 2 X on lens. AF is slow and, except in bright light almost non existent. Tripod is a must with IS on version 2. I also stop down to about f 10 or 11 to try to extract every bit of sharpness. However, if I am doing this it means that it is either stacked extenders or no image at all, so if I can get any usable image I am happy.

BTW, I use a 1D Mark 2 so AF is pretty good.