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First try with this combo

Started 10 months ago | Discussions thread
John Sheehy Forum Pro • Posts: 26,698
Re: EF 2x II stacks with any EF extender, behind it.

Victor Engel wrote:

Theres a page out there somewhere where they stacked some ungodly number of extenders and compared the result to uprezzing a photo with no TC. It was a dead heat. They also commented that it was virtually impossible to focus even with live view with all those stacked extenders.

That's why pixel density is the better choice; it has points of diminishing returns and a wall at some point (way beyond current densities) but never gets worse at any point, optically, as combined aberrations of multiple TCs can get.

With long stacks of TCs and/or converters, I have found that de-centering easily becomes a problem, if the whole system is not supported in a way that keeps each connection from having a slight bend due to gravity. It would actually be quite tedious, I think, to tune this, even if you had mechanisms to do so.

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Beware of correct answers to wrong questions.
John
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