Possible problem with teleconverter

[Netskimmer]

I got my teleconverter today, a Rokinon auto tele converter 2x N/AI. Not sure if this is a problem or of the thing is supposed to work this way but I cannot adjust the aperture on my lenses from the sub-command dial while using it. It has a lever in it that connects to the aperture lever in the lens and I can widen the aperture by connecting it to the lens and maipulating it's lever and I can press the DoF preview button and see a difference so everything is connecting on mechanical level, but the aperture is set at F0 in the camera and cannot be changed. It's basically treating the lens as a non-CPU lens, mainly because the the tele-converter doesn't have contacts to transmit data between the camera and lens. I can set the max aperture in the non-cpu lens settings menu but his has no effect on the actual aperture used to take the image and what I see when I press the DoF preview button does not change. I there a way to alter my aperture setting or do I need to use a lens with an aperture ring?

 

[gsgary]

Send it back and get the Kenko 300pro

 

[Netskimmer]

This one only cost me $9.95 and I really only bought it to use on the t-mount lens which has it's own aperture ring, I would just be nice if I could use it on the others as well. Besides, it would cost almost as much to ship it back as to keep it. I'm mostly concerned that it is defective.

 

[KmH]

Now you know why it only cost $9.95.

 

[Netskimmer]

Now you know why it only cost $9.95.

No, not really. Was it $9.95 because it's just a cheap, ultra basic teleconverter that won't work properly without an lans aperture ring or because it is defective? I knew it wouldn't have any bells and whistles at that price. I just want to make sure that is how it is supposed to work. I am mainly confused about this because it has an internal lever meant to interact with the lens' aperture and with the camera but I don't know if this is just in regards to setting a max aperture or if there is supposed to be a means of setting the aperture in-camera without the need for a lens ring. If you can, I would like to know how as I have searched the camera's manual and google and found nothing.

 

[tirediron]

You've got a manual TC which will only work on lenses which have an aperture ring.

 

[Netskimmer]

Cool, thanks. Now if I could just get the damned weather to clear up, it's been overcast and so foggy at night that I can't see 20yds ahead of me, terrible conditions for lunar photography.