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D0ri · 05-24-2010, 08:27 AM

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?

TheTenaciousOne · 05-24-2010, 08:33 AM

No as the aperture blade isnt electronically controlled it will go back to fully closed as soon as its taken off the camera

D0ri · 05-24-2010, 08:48 AM

so there is no way to connect 55-300 to simple extended tubes?
blah :\

**pacerr** · 05-24-2010, 09:12 AM

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

H2

newarts · 05-24-2010, 09:46 AM

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

D0ri · 05-24-2010, 10:23 AM

Yes I did that with some nikon old lens. but I don't want to do that with a new one...

Originally posted by pacerr

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

H2

huh?!

Marc Sabatella · 05-24-2010, 11:41 AM

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.

SOldBear · 05-24-2010, 11:48 AM

Originally posted by D0ri

huh?!

Yes. Like this. I have 3 of them.

05-24-2010, 08:27 AM	#1
D0ri Forum Member Join Date: Oct 2008 Photos: Gallery Posts: 76	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?

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05-24-2010, 08:33 AM	#2
TheTenaciousOne Senior Member Join Date: Jul 2009 Location: Adelaide, SA, Australia Photos: Gallery Posts: 111	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
D0ri Forum Member Join Date: Oct 2008 Photos: Gallery Posts: 76 Original Poster	so there is no way to connect 55-300 to simple extended tubes? blah :\

05-24-2010, 09:12 AM	#4
pacerr Loyal Site Supporter Join Date: Jan 2008 Location: Paris, TN Photos: Gallery \| Albums Posts: 3,350	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
newarts Inactive Account Join Date: Dec 2008 Location: Ames, Iowa, USA Photos: Albums Posts: 2,965	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
D0ri Forum Member Join Date: Oct 2008 Photos: Gallery Posts: 76 Original Poster	Yes I did that with some nikon old lens. but I don't want to do that with a new one... Originally posted by pacerr 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
Marc Sabatella Veteran Member Join Date: Sep 2006 Location: Denver, CO Photos: Gallery Posts: 10,685	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
SOldBear Veteran Member Join Date: Feb 2009 Location: Alameda, CA Posts: 3,206	Originally posted by D0ri huh?! Yes. Like this. I have 3 of them.

Disconnect lens and keeping aperture fixed

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