Can you stack Canon 2X plus 1.4 Extenders?

[TexPhoto]

The moon (and the Earth under you) are moving remember. You can't take a long exposure unless you have some way to track the moon.

Objection! While at night it is dark here on earth, on the visible moon it is day. I have successfully photographed the moon with a 600 L II, a Canon 2x III and a Kenko 1.4 x (in this combination you don't need any extension tube). I used the 6D @ ISO 1600 and f 13 and 1/320 s. At this magnification, you clearly see the moon moving, but believe me, 1/320 securely freezes that movement!

No argument here. 1/320 is not a long exposure.

 

[Marsu42]

Incidentally, the 100L is on the list of compatible lenses, too:http://www.kenkoglobal.com/pdf/TELEPLUS_DGX_series_CompatibilityList.pdf

Now look at that, this means they really fixed it with a silent fw update! Thanks for the link.

It's a fact that the 100L was broken with newer cameras, but this pdf saying otherwise means Kenko changed their fw with newer revisions. It surely wasn't Canon, and Kenko obviously doesn't want to announce the update too much to prevent people trying their old versions exchanged.

 

[Mt Spokane Photography]

Incidentally, the 100L is on the list of compatible lenses, too:http://www.kenkoglobal.com/pdf/TELEPLUS_DGX_series_CompatibilityList.pdf

Now look at that, this means they really fixed it with a silent fw update! Thanks for the link.

It's a fact that the 100L was broken with newer cameras, but this pdf saying otherwise means Kenko changed their fw with newer revisions. It surely wasn't Canon, and Kenko obviously doesn't want to announce the update too much to prevent people trying their old versions exchanged.

The 100L has always been on the compatibility list, but it does not work with newer Canon cameras. I bought a 2nd Kenko TC to try it a couple of months ago, but it does not work.

Kenko tech support does not even respond to my polite inquiries, so I've written them off.

 

[dgatwood]

The 100L has always been on the compatibility list, but it does not work with newer Canon cameras. I bought a 2nd Kenko TC to try it a couple of months ago, but it does not work.

Kenko tech support does not even respond to my polite inquiries, so I've written them off.

Without knowing more, it's a little premature to blame Kenko. It may not be possible to prevent the freeze without seriously breaking normal operation.

Now that I know that I have an affected lens (albeit one that I never would use with a 1.4x TC), I'm half tempted to wire a cheap extension tube to an Arduino and sniff both data buses so I can see what's happening. In particular, I'd like to know why it affects only some lenses and not others.

The nice thing about the Canon lens protocol is that (assuming the info I have is correct) it is both documented and basically human-readable, so it should be really easy to figure out what's going on.

 

[dgatwood]

I occasionally stack 1.4x and 3x Kenko TCs. Here's a shot with the 70–300L and the stacked TCs (1260mm):

And the stock 300mm shot:

And for fun, the same angle (approximately) at 70mm, 35mm, and 16mm (all unprocessed):

 

[Marsu42]

Now look at that, this means they really fixed it with a silent fw update! Thanks for the link.

The 100L has always been on the compatibility list, but it does not work with newer Canon cameras. I bought a 2nd Kenko TC to try it a couple of months ago, but it does not work. Kenko tech support does not even respond to my polite inquiries, so I've written them off.

* The 100L has always been on the list, but did the list include the 5d3 and 6d back then? The pdf linked is a newer version from January 2014.

* When you tried your your 2nd tc, are you positive it was a new revision? I know it's near impossible to say as the fw update is really "silent" and you probably can only recognize small differences in the packaging or something like it. But you can ask the dealer for the delivery chain, i.e. when this specific tc left Kenko?

* Kenko not responding: Doh, that's annoying. They do respond though, I remember reading in a CR thread on 5d3 release time that they advised a customer not to buy the 5d3 with lens xyz because they ack'ed it won't work. That's for the "old" revision. If there is a "new revision" at all :-\

 

[antonioleandro]

Has anyone tried to stack one 2x II, one 2x III and one 1.4x II? I don´t know how they could be stacked, if it is lens + 2x III + 2x II + 1.4x II or Lens + 2x II + 1.4x II + extension tube + 2x III?

 

[Canon1]

The moon (and the Earth under you) are moving remember. You can't take a long exposure unless you have some way to track the moon.

Objection! While at night it is dark here on earth, on the visible moon it is day. I have successfully photographed the moon with a 600 L II, a Canon 2x III and a Kenko 1.4 x (in this combination you don't need any extension tube). I used the 6D @ ISO 1600 and f 13 and 1/320 s. At this magnification, you clearly see the moon moving, but believe me, 1/320 securely freezes that movement!

Yes, it can be done... But this is pretty soft even for web viewing. Drop the 1.4 and shoot with the 600+2x and crop a little and your final image would be much sharper and allow for two full stops lower ISO or faster shutter speed.