How can you find the front element size of Canon lenses?

[cayenne]

I just picked up one of the SLR Magic Anamorphot lenses to hook onto my DSLR lenses to try to shoot anamorphic ally...I got a good deal on ebay for one.

The SLR Magic site says it works best on lenses with a front element of 50mm or less. I can't find easily on the canon site the specs saying the front element size, only the filter size.....

Any suggestions how to look up lenses that have 50mm or less front lens elements?

Thank you in advance,

cayenne

 

[photon]

Well it won't be fool proof, but you can calculate what at least the minimum requirement is by doing the math on the focal length and f-stop.

50mm f1.2

50/1.2=41.7mm minimum

It should get you at least close enough to know which lenses will and will not work well.

 

[rfdesigner]

Well it won't be fool proof, but you can calculate what at least the minimum requirement is by doing the math on the focal length and f-stop.

50mm f1.2

50/1.2=41.7mm minimum

It should get you at least close enough to know which lenses will and will not work well.

Works perfectly on long focal length lenses. much less so on wide angle lenses as even when stopped right down the light beam from different directions uses quite different portions of the front element.

To get an idea of the size, pick up the lens without camera or caps and look in the front of it from arms length, tilt the lens back and forth to see how the aperture moves about on a wide angle vs a long lens.

 

[Loswr]

If it's a lens you own, use a ruler. If you don't own it, Google image search it for a front view, and estimate front element diameter as a ratio of filter thread diameter (specified), by 'measuring' both based on pixel width in Photoshop, etc.

 

[pwp]

Any suggestions how to look up lenses that have 50mm or less front lens elements?

Google? There are lenses around with 49mm thread sizes...you may need an adapter to fit it to a modern camera.

-pw

 

[PropeNonComposMentis]

SIAC. Works every time !

 

[cayenne]

SIAC. Works every time !

Not sure what "SAIC" stands for....?