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Vormulac · 06-26-2009, 05:19 AM

Hi folks,

I wonder if someone can help me out here. I was going to buy a second hand lens this morning, but I noticed that when I tweaked the lever thingie on the back of the lens (the bit that would normally be inside the camera when mounted) there was no discernable difference to anything inside the lens. I am probably mistaken, but I would have assumed when I moved that lever that I would see the aperture close and then open again when released - is that right?
It's an old Tamron with a Canon adaptall2 mount on the back if that makes any difference.

can't believe I'm asking something so basic

Cheers!

xjjohnno · 06-26-2009, 05:30 AM

At what setting was the aperture ring, if at the widest value then that lever is going to do bugger all.

K-9 · 06-26-2009, 05:44 AM

I never play with lever thingies. Have you tried turning the actual aperture ring?

Vormulac · 06-26-2009, 06:19 AM

I did try turning the aperture ring and I didn't see anything happen inside, but I wasn't sure what I was expecting to see to be honest, whether I would need to be fiddling with the lever whilst turning the ring to see a result or whether adaptall2 mounts work 'differently' in some way. I don't know. It's a Tamron 90mm SP2 f/2.5 52B and it's only £15 so perhaps I should take a punt on it and see how it goes?

joefru · 06-26-2009, 06:29 AM

Originally posted by xjjohnno

At what setting was the aperture ring, if at the widest value then that lever is going to do bugger all.

I was under the impression that it was opposite, that the lever closed the aperture.

If you're allowed to handle it, can you just put it on your camera to see if it works okay?

Vormulac · 06-26-2009, 06:50 AM

That's a good idea, but I would need to swot up on adaptall mounts first. I do have an old Tamron zoom with an adaptall2 mount, so I would have to work out how to get that off there and onto the new one before I could test it - I really am clueless about this older kit! lol

Vormulac · 06-26-2009, 11:27 AM

I'm glad I took a punt on that lens, looks like it was the Canon adaptall mount that was shafted, I put my Pentax one from my zoom lens on and it appears to work perfectly! Man these images are beautiful!
Now I just need to work out how to do the whole stopping down thing on a manual lens...

Nick Siebers · 06-27-2009, 07:37 PM

That's a great lens at a great price - enjoy, and share pics!

Andi Lo · 06-27-2009, 09:57 PM

Wow, that's a steal. Enjoy the lens!

06-26-2009, 05:19 AM	#1
Vormulac Senior Member Join Date: Feb 2008 Location: London Posts: 219	Stupidly basic question about a lens. Hi folks, I wonder if someone can help me out here. I was going to buy a second hand lens this morning, but I noticed that when I tweaked the lever thingie on the back of the lens (the bit that would normally be inside the camera when mounted) there was no discernable difference to anything inside the lens. I am probably mistaken, but I would have assumed when I moved that lever that I would see the aperture close and then open again when released - is that right? It's an old Tamron with a Canon adaptall2 mount on the back if that makes any difference. can't believe I'm asking something so basic Cheers!

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06-26-2009, 05:30 AM	#2
xjjohnno Veteran Member Join Date: Jan 2009 Location: Melbourne Australia Photos: Gallery Posts: 2,115	At what setting was the aperture ring, if at the widest value then that lever is going to do bugger all.

06-26-2009, 05:44 AM	#3
K-9 Veteran Member Join Date: May 2009 Location: USA Photos: Albums Posts: 1,971	I never play with lever thingies. Have you tried turning the actual aperture ring?

06-26-2009, 06:19 AM	#4
Vormulac Senior Member Join Date: Feb 2008 Location: London Posts: 219 Original Poster	I did try turning the aperture ring and I didn't see anything happen inside, but I wasn't sure what I was expecting to see to be honest, whether I would need to be fiddling with the lever whilst turning the ring to see a result or whether adaptall2 mounts work 'differently' in some way. I don't know. It's a Tamron 90mm SP2 f/2.5 52B and it's only £15 so perhaps I should take a punt on it and see how it goes?

06-26-2009, 06:29 AM	#5
joefru Senior Member Join Date: Mar 2008 Location: South Louisiana Photos: Gallery Posts: 210	Originally posted by xjjohnno At what setting was the aperture ring, if at the widest value then that lever is going to do bugger all. I was under the impression that it was opposite, that the lever closed the aperture. If you're allowed to handle it, can you just put it on your camera to see if it works okay?

06-26-2009, 06:50 AM	#6
Vormulac Senior Member Join Date: Feb 2008 Location: London Posts: 219 Original Poster	That's a good idea, but I would need to swot up on adaptall mounts first. I do have an old Tamron zoom with an adaptall2 mount, so I would have to work out how to get that off there and onto the new one before I could test it - I really am clueless about this older kit! lol

06-26-2009, 11:27 AM	#7
Vormulac Senior Member Join Date: Feb 2008 Location: London Posts: 219 Original Poster	I'm glad I took a punt on that lens, looks like it was the Canon adaptall mount that was shafted, I put my Pentax one from my zoom lens on and it appears to work perfectly! Man these images are beautiful! Now I just need to work out how to do the whole stopping down thing on a manual lens...

06-27-2009, 07:37 PM	#8
Nick Siebers Veteran Member Join Date: Jun 2008 Location: Madison, WI Photos: Gallery \| Albums Posts: 2,165	That's a great lens at a great price - enjoy, and share pics!

06-27-2009, 09:57 PM	#9
Andi Lo Veteran Member Join Date: Jul 2008 Location: Halifax, Nova Scotia Posts: 2,924	Wow, that's a steal. Enjoy the lens!

Stupidly basic question about a lens.

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