Focal length on DX aspheric lenses?

nikosb · Jan 12, 2015

I am looking at aspheric lenses on DX and many of them don't list the focal length. Does anyone the focal length for any of these?

50mm Diameter SKU 44653
50mm Diameter SKU 12834
44mm Diameter SKU 4558
59mm Diameter SKU 13569
66mm Diameter SKU 13618
63mm Diameter SKU 13736

If you do please indicate if it is effective focal length of back focal length.

Jakefreese · Jan 12, 2015

I have some 66mm and the back of my Cree xml2 are 2.143" to the back of the star.

Norm · Jan 12, 2015

Have you tried contacting DX?

If anyone has the answer they should know.

Norm

nikosb · Jan 12, 2015

Jakefreese said:
I have some 66mm and the back of my Cree xml2 are 2.143" to the back of the star.

That's for the 66mm diameter SKU 13618?

nikosb · Jan 12, 2015

Norm said:
Have you tried contacting DX?

If anyone has the answer they should know.

Norm

No luck, I get an automated system that tells me to contact Aftersales. I want to know before I buy.

Norm · Jan 13, 2015

nikosb said:
No luck, I get an automated system that tells me to contact Aftersales. I want to know before I buy.