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05-24-2010, 08:27 AM   #1
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Disconnect lens and keeping aperture fixed

Hey.

In canon you can disconnect the lens from the camera and still keep a fixed aperture, this is good when you have extended-tubes and the lens doesn't have an aperture ring.

Is it possible on Pentax too?

05-24-2010, 08:33 AM   #2
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No as the aperture blade isnt electronically controlled it will go back to fully closed as soon as its taken off the camera
05-24-2010, 08:48 AM   #3
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so there is no way to connect 55-300 to simple extended tubes?
blah :\
05-24-2010, 09:12 AM   #4
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You could take the optics out of AE-capable TCs. I have 25mm and 40mm Tokina brand tubes made that way.

H2

05-24-2010, 09:46 AM   #5
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One way is to reverse the lens exposing the aperture control lever.

It is practical to hold the lever in a fixed position using a small piece of tubing as shown here:


Dave
05-24-2010, 10:23 AM   #6
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Yes I did that with some nikon old lens. but I don't want to do that with a new one...

QuoteOriginally posted by pacerr Quote
You could take the optics out of AE-capable TCs. I have 25mm and 40mm Tokina brand tubes made that way.

H2
huh?!
05-24-2010, 11:41 AM   #7
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A teleconverter with the glass remvoed serves as an extension tub, and it's much easier to find a TC that supports auto-aperture than to find an extension tube that does. Given that most TC's perform worse than simply cropping an image taken without the TC, removing the glass is often the best thing you can do for a TC.
05-24-2010, 11:48 AM   #8
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QuoteOriginally posted by D0ri Quote
huh?!
Yes. Like this. I have 3 of them.



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