Canon Extender EF 1.4x III Review -
Re: Extenders and Compatability...
larry wrote:
Marco Nero wrote:
Not at all. It's not because of the limitations of "lower end cameras" but because of Canon's conscious decision to cripple the use of this adapter on some cameras but not others. The fact that some users have reported success... having taped over the contacts to prevent the Extender from reporting back to the camera... proves they can be used on models that it was not intended to be used for. I mounted one to a telescope last night and though the shot was framed and the camera instructed to "release shutter without a lens present", the Extender kept telling the camera to shut off.
.
The general consensus from experienced photographers is that "Canon intentionally cripples the use of extenders" - presumably to influence camera migration to higher-end models. Feel free to conduct your own online research and you'll find that my opinion on this matter is repeated by many others. Having been a licensed Canon dealer years ago, I can assure you that this comes as no surprise to me. The punishment of withholding a star because Canon shrewdly chose to penalize anyone without a Pro-Camera (yes, Canon only make ONE model of Pro camera) seems entirely fair to me.
"some users have reported success" (and many more have reported failures most of the time).
"general consensus from experienced photo..." (all of whom are not camera engineers).
"Having been a licensed Canon dealer years ago, I can assure you that this comes as no surprise to me." (what does being a saleman have to do with your 'knowledge' of a complex system?)
The limitations of AF at apertures of f8 are well-known. You are deliberately ignoring those, because 'you want it!!!'.
Two different perspectives but both are valid. If the people get the lens to focus with the tape on and not with it off then this implies that the extender is impeding something that can work. That doesn't mean it is reliable, true, false or a deliberate limitation. It does however add weight to the argument. Some reliable test data with results is needed. The point is you're both right.
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