Adding telephoto converter onto 16 IS II at DVinfo.net

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Old July 27th, 2004, 02:25 AM   #1
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Adding telephoto converter onto 16 IS II

Hello,

I am new to this forum and just starting to plant my feet into the xl1s.

My question is regarding adding a telephoto converter to the 16 IS II lens. The lens I purchased is a 2x telephoto converter made by Digital Optics. It's a 62mm converter, so naturally it is made for a 62mm ring adapter which allows it to screw onto the 72 mm 16 IS II.

The problem I am having is that after I screw the telephoto converter into the 62mm ring (which is made by Bower) and then screw the lens/ring onto the 16 IS II and look through the viewfinder, I no longer am able to see the full field of vision that I should be able to; it becomes like looking through a telescope, where there is a black ring surrounding the image, or as if I closed the iris down. I don't know if I am explaning myself correctly; the best example I can give is that it looks like the end of a Looney Toons episode where the image is slowly swallowed out-to-in by a black circle and there is only a hole of in the middle where Porky Pig sticks his head out and says "That's all folks!" (wow...I just destroyed my future credibility on this forum =/)

Anyway, I would appreciate it if someone coudl tell me if I am simply attaching the converter on wrong, or if maybe the converter I bought simply isn't compatible with the 16 IS II (which shouldn't be the case...).

Also, I am wondering if, since zooming in changes the focal length of a lens, if zooming in with the 16 II IS would be the same thing as using a telephoto lens (i.e. if I would have the same picture quality if I adjusted the focal length of my lens by zooming in as opposed to actually adding a telephoto converter).
Jason J Wong is offline   Reply With Quote
Old July 27th, 2004, 03:23 AM   #2
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You can expect mechanical vignetting (the darkened corners you discribed) when you are attaching smaller adapters to your lens; get a 72mm and toss the step ring.

Th-th-th-that's All, Folks!
Chris McKee is offline   Reply With Quote
Old July 27th, 2004, 11:59 PM   #3
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Thanks for responding...

So, do you mean I have to get a 72mm lens in order not to have the mechanical vignetting and that I can't use the 62mm converter to get the full picture?

Or, do you mean I need a 72mm ring that's compatible with the telephoto converter?
Jason J Wong is offline   Reply With Quote
Old July 28th, 2004, 02:54 AM   #4
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even just matching the thread size on the lenses won't guarantee against vignetting, but the 72MM telephoto from digital optics will work with the standard xl1s lens.
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