Non-connected Aperture

[Snapitjack]

Thanks man. Never heard of them before but checked out the site. Looks great!

You might want to check out KEH. They have a pretty impressive collecton of used teleconverters and you could probably replace yours fairly cheap.

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[robbins.photo]

Thanks man. Never heard of them before but checked out the site. Looks great!

You might want to check out KEH. They have a pretty impressive collecton of used teleconverters and you could probably replace yours fairly cheap.

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They've been around for a long time and have a great reputation. I bought 1 of my teleconverters from them used, as well as a 50 mm lens, never had any issues with either.

 

[Derrel]

Sigma 50-500 & Canon 70D

Question; When the lens is removed from the camera, does the aperture stay where it was set by the camera, park in the most closed position or park in the most open position?

Is it also the same for all lenses made for Canon or does it depend on the lens manufacturer?

Thank you for any insight.

Dear OP,

Canon sets the protocol for its EOS system lenses; third-party manufacturers FOLLOW those protocols, so that their lenses will actually FUNCTION properly when used on Canon EOS system bodies, and with Canon EOS System accessories like telephoto converters, extension tubes, and so on. It's pretty much a given that the diaphragm behavior of a modern, multi-pin autofocusing lens will follow Canon's utterly simple, child-like engineering instructions for diaphragm actuation and diaphragm resting state--no matter what silly attempts at out-thinking the obvious that some silly person might try to lead us astray with, in a wildly imaginative flight of fancy.

Please ignore those who cannot seem to read simple questions like yours, and carry on. Some people here seem to be unaware of where they are, or what language is being spoken here. The language of photography, and English. Welcome to TPF. Please excuse Captain Pedantic's attempt to derail your thread. Your questions, PLURAL, were well-understood by at least a couple of us here.

 

[Gavjenks]

Derrel, I really very much doubt that Canon sets protocols for things that aren't even in their manuals and are clearly not intended features. Such as how lenses behave when you hold down the DOF preview button and suddenly remove the lens without turning off the camera.
And possibly they may not even follow Canon protocols for things that probably are specified, like default resting state. Why not? Because if you design a lens for 5 different mounts, it would cost more to have a version that follows everybody's expectations for each mount perfectly. That may or may not be worth the investment depending on a company's business plan.
And of course, they are under no legal obligation or anything, and there are many examples of lenses clearly not following the same patterns. Sigma's zoom rings tend to go in the opposite direction as Canon's, even in Canon mount lenses.

Thus, there's no particular reason to assume that other manufacturers' lenses will work the same way on a given variable, a priori.

Plus, we have a person in this thread who already said that the Tamron lens might not hold its aperture when using the DOF preview button etc. It seems like he may have been confused about how exactly you do the DOF preview button thing, but I don't own a Tamron to check myself. If somebody does and could check that, it would be informative.

If somebody could test a Tokina, that would be nice, too.