Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
05-08-2008, 01:16 AM   #1
New Member

Join Date: Apr 2008
Location: Alabama
Posts: 7

OK, I probably spelled that wrong but what is an aspherical lens and what is the difference in that and just a standard digital zoom lens of the same speed and focal length?

05-08-2008, 01:40 AM   #2
Veteran Member
creampuff's Avatar

Join Date: May 2007
Location: Singapore
Photos: Gallery
Posts: 3,955
Google is your friend.
05-08-2008, 01:49 AM   #3
Veteran Member
ftpaddict's Avatar

Join Date: Jan 2008
Location: Yurp
Photos: Gallery
Posts: 4,669
Alternatively, Wikipedia is your teacher: Aspheric lens - Wikipedia, the free encyclopedia
05-08-2008, 07:20 PM   #4
New Member

Join Date: Apr 2008
Location: Alabama
Posts: 7
Original Poster
I've checked both and I still can't find the advantages.. WHAT IS THE DIFFERENCE IN QUALITY???

05-08-2008, 07:51 PM   #5
Veteran Member

Join Date: Feb 2008
Location: Toronto
Posts: 3,915
there are plenty of resources on google
Aspherical Lenses
05-08-2008, 08:39 PM   #6
Ole's Avatar

Join Date: Sep 2006
Location: Copenhagen, Denmark
Photos: Gallery | Albums
Posts: 3,881
Bottom line is that a lens can be constructed with fewer lens elements if one or two of the elements are aspherical. This may reduce cost and weight while maintaining or even improving the optical quality.

As an example the smc Pentax-FA 28mm/2.8 lens has five elements whereas the older smc Pentax-A 28mm/2.8 lens has 7 elements, and the FA version is generally considered the better of the two.
05-08-2008, 09:15 PM   #7
Veteran Member

Join Date: Mar 2008
Location: CT / NY
Photos: Gallery
Posts: 822
QuoteOriginally posted by k100d Quote
Wow.. too much photography lately... first glance at your comment above i was like this:

"no need for lens caps? WTF is he talking about? "

The i re-read it and understood... it cracked me up!

  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
k-mount, lens, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
FYI- Aspherical Surfaces desertscape Pentax Medium Format 1 09-22-2010 04:52 PM
Sigma 28-70mm F2.8 EX Aspherical Mitch401 Pentax SLR Lens Discussion 1 01-20-2010 01:24 AM
For Sale - Sold: Tamron 28-80 AF aspherical (2 available) Steve Beswick Sold Items 1 05-08-2009 11:10 PM
Aspherical Pentax Lenses jfsavage Pentax SLR Lens Discussion 14 12-31-2008 01:26 PM
Sigma 15-30 mm F3.5-4.5 EX DG ASPHERICAL matix Pentax SLR Lens Discussion 0 04-15-2007 10:53 PM

All times are GMT -7. The time now is 02:51 PM. | See also:, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]