Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
02-19-2008, 03:54 AM   #1
New Member




Join Date: Feb 2008
Posts: 7
DA FA lenses; what gives

I try to search about these but the engine rejects DA as being a string too short!!

Any way I would appreciate some history on these categories of lenses

DA withe the supersonic engines are SMD's?

DA's are all special high tech relatively new lenses?

FA; not sure about these at all.

Thanks

02-19-2008, 04:48 AM   #2
Veteran Member
Buddha Jones's Avatar

Join Date: Sep 2006
Location: Charlotte, NC
Photos: Gallery
Posts: 2,591
FA's are good on both film and digital APS-C and Full Frame sensors. DA's are designed for digital cameras only APS-C sensors. DA's with SDM are the newest breed, same as the DA as far as digital only but the SDM, SDM lenses offer two main advantages - they're quieter, and they can potentially focus faster thanks to the higher torque, gearless motors they employ.
02-19-2008, 04:59 AM   #3
Loyal Site Supporter




Join Date: Sep 2006
Location: Bronx NY
Photos: Gallery | Albums
Posts: 5,611
Hi Hobie, welcome to the forums.

I'll take a stab at this and if I make a mistake I'm sure other will chime in.
DA lenses are manufactured with the size of the digital APS-C sensor in mind. The digital sensor is about 1/3 smaller than the corresponding film size which is why you always see the "1.5 crop factor" mentioned. In other words, if you were to put a DA lens on a film camera the image would most likely not cover the full frame of the film. DA lenses are therefore smaller and usually lighter than their film counterparts. DA lenses also have special "digitally optimized" coatings that theoretically specifically address the optical characteristics of the digital sensor.
FA lenses were designed to fit on film cameras. Therefore they are usually a bit bigger and heavier. They obviously can fit on both film and digital cameras. They also lack the digitally optimized coatings of the DA lenses. To be truthful I have not noticed that the different coatings of the two different lenses makes much difference, but there IS a big difference between no coatings and the SMC coatings of both types of lenses.
The new DA* lenses are both weather sealed and have internal focusing motors. DA lenses without the "*" are neither weather sealed nor do they have the in lens focus motors.

NaCl(hope that helps)H2O
02-19-2008, 06:08 AM   #4
Veteran Member
Finn's Avatar

Join Date: Feb 2007
Location: Phoenix
Photos: Gallery
Posts: 1,056
Some DA lenses do work on film, the DA40 being one of them. Apparently the new DA* 200 does as well.

02-19-2008, 09:01 AM   #5
Pentaxian
Moderator Emeritus




Join Date: May 2007
Location: Edmonton Alberta, Canada
Photos: Gallery | Albums
Posts: 10,648
You may want to also check here:
Pentax Lens Review Database - Main Index

And there is good background info on a number of lenses here with reviews:
Pentax Lens Tests
02-19-2008, 11:43 AM   #6
New Member




Join Date: Feb 2008
Posts: 7
Original Poster
Excellent thanks guys. It is all clear now.
Reply

Bookmarks
  • 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!
da, fa, k-mount, lenses, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Pentax Km and old manual lenses: SMC Takumars & Tamron Adaptall 2 lenses Kendrick Troubleshooting and Beginner Help 10 04-14-2010 03:23 AM
For Sale - Sold: Yard sale: M lenses, K 300mm, DA 14mm, ME film body, Nikkor lenses and more Nachodog Sold Items 24 12-26-2009 12:03 AM
For Sale - Sold: Lenses, lenses, lenses... and a flash! pbo Sold Items 18 05-28-2009 04:35 PM
For Sale - Sold: M42 / K / KA / FA Lenses Grab bag of Vintage to Current lenses. 50mm FA f/1.4 MikeDubU Sold Items 10 02-09-2009 12:45 PM



All times are GMT -7. The time now is 02:30 PM. | See also: NikonForums.com, CanonForums.com 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?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top