|
![]() |
|
LinkBack | Thread Tools | Search this Thread |
![]() |
#1 |
Senior Member
Join Date: Jan 2004
Posts: 6,964
|
![]()
Looking at some tamron lenses I noticed the word "Aspherical" used. Is this the equivalent of ultrasonic on a canon lens?
|
![]() |
![]() |
Sponsored Links |
|
![]() |
#2 |
Senior Member
Join Date: Jun 2005
Posts: 804
|
![]()
"Aspherical" is a lens design that helps to maintain a more uniform sharpness and color rendition over the entire coverage area. Aspherical elements are harder to produce than non-aspherical elements, so their incorporation jacks up the price of the lens.
Grant |
![]() |
![]() |
![]() |
#3 |
Senior Member
Join Date: Jan 2004
Posts: 6,964
|
![]()
Thanks:-)
|
![]() |
![]() |
![]() |
#4 |
Senior Member
Join Date: Apr 2003
Location: Eastern Ontario Canada
Posts: 823
|
![]()
http://en.wikipedia.org/wiki/Aspherical_lens
An aspheric lens or asphere is a lens whose surfaces have a profile that is neither a portion of a sphere nor of a circular cylinder. In photography, a lens assembly that includes an aspheric element is often called an aspherical lens. |
![]() |
![]() |
![]() |
Thread Tools | Search this Thread |
|
|