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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 31 Aug 2010 (Tuesday) 08:18
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Tokina 11-16 users, question about the rear lens element movement

 
MintMark
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Aug 31, 2010 08:18 |  #1

Hello,

The Tokina 11-16 is always out of stock whenever I ask in shops, so I thought I would ask my question here. I've searched the forum already but found no answer. I want to find out whether it will work with a clip in filter that fits behind the lens (like http://www.astronomik.​com/en/eos_clip-filters.html ) (external link)

The obvious problem is to make sure the rear element doesn't move so far back that it touches the filter. I've done experiments with a 10-22 lens and its rear element extends behind the metal EF mount at 10mm and is just over half an inch (1.5 cm) inside the lens (below the metal EF mount) at 22mm. It seems to work better the further away the element is from the filter... too close and you get distorted corners.

So, can anyone describe the range of movement of the rear element of the Tokina 11-16, with respect to the back edge of the metal EF mount? How far inside the lens is the element at 11mm and 16mm, and which focal length is the element most inside the lens?

Thanks in advance for any help,

Mark


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Alex_Venom
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Aug 31, 2010 12:28 |  #2

Really have no idea, but what's a clip filter? What is it used for? Never heard about it...


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MintMark
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Aug 31, 2010 12:41 |  #3

Alex_Venom wrote in post #10823642 (external link)
Really have no idea, but what's a clip filter? What is it used for? Never heard about it...

The one I have blocks out light pollution at night time. It's used for astrophotography where the glow of light from urban streetlights makes the sky look orange and washes out the fainter stars. With the filter in place you only collect the starlight and get much better pictures.

The filters are quite expensive and they don't make them in normal lens thread sizes. It's cheaper to make a small one that "clips" between the lens and the mirror. It's in a sprung metal frame that holds it in place.


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msowsun
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Aug 31, 2010 13:56 |  #4

Even though the 11-16 has a cropped image circle, it does not have an EF-S mount and no part of the rear element ever extends beyond the mount. This is the same for all 3rd party "crop" lenses. It would be perfectly safe to use this clip filter with the 11-16.

Currently it is only Canon that makes EF-S lenses where the rear element can extend beyond the lens mount.


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Alex_Venom
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Aug 31, 2010 14:30 |  #5

Cool, MintMark! Thanks for the explanation ;)


Photography is about GEAR and not talent or practice. Practice won't make you a better photographer. Expensive equipment will. =D
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MintMark
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Aug 31, 2010 15:22 |  #6

msowsun wrote in post #10824107 (external link)
Even though the 11-16 has a cropped image circle, it does not have an EF-S mount and no part of the rear element ever extends beyond the mount. This is the same for all 3rd party "crop" lenses. It would be perfectly safe to use this clip filter with the 11-16.

Currently it is only Canon that makes EF-S lenses where the rear element can extend beyond the lens mount.

Thanks Mike, I understand. Even though it won't hit the filter there can still be a problem with image quality in the corners if the rear element is too close to the filter. This showed up with a 10-22 (with the back removed). At anything less than 22mm (where the element is 1.5cm inside the lens) the (stars in the) corners are distorted. Remove the filter and they are OK. I think it must be to do with the angle of the light rays as they go through the filter.

Anyway, that's why I was asking how far inside the lens the rear element is.

BTW I found your video to show how the front element moves... I'm not expecting another one :) :)


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Tokina 11-16 users, question about the rear lens element movement
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