Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
04-28-2009, 09:39 AM   #1
Inactive Account

Join Date: Nov 2007
Location: Stockport UK
Posts: 16
Questions on old lenses

When I put a old prime lens on my K10d the possible focal length come on the LCD monitor & I just scroll till I get the right one for the lens I'm using.

I have two questions on this (1) If I used a different focal length what would happen and (2) how do you set it for a zoom lens?

I would appreciate any comments on this.


04-28-2009, 09:55 AM   #2
Senior Member
MrEspie's Avatar

Join Date: Jan 2009
Location: University of Waterloo, ON
Photos: Gallery
Posts: 239
This question came up a while ago. The input focal length is mostly just used by the camera for shake reduction and EXIF info. I can't speak for the K10D, but I have a K200D which is fairly similar.

If you change the lens while the camera is powered on, you won't get this dialogue again. However, whenever you power the camera on (with SR engaged) with a manual lens, you will get it. For prime lenses with a focal length not listed, you select the closest available focal length. For zooms, there is not so much certainty as to what FL to set. If you know in advance what range on the zoom you plan to be using, you should set it in the middle of that. Somebody did a small study on this and found that it is best to underestimate the focal length (as opposed to overestimating). This of course holds in theory as setting a shorter focal length implies that the sensor moves less as opposed to more. So, if you are really, really unsure about which FL you'll be using on a zoom, set the IFL for the bottom end - it won't make your pictures any worse than sans-SR.

I almost forgot - if you need to change the input focal length at any time, it is the very last option on the capture tab of the menu so just hit menu->up->OK and find your FL.

I hope this answers your question,
04-28-2009, 12:36 PM   #3
Inactive Account

Join Date: Nov 2007
Location: Stockport UK
Posts: 16
Original Poster
Thanks that has really helped


  • 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!
camera, length, lens, pentax help, photography, questions
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
questions re WR lenses kpp80202 Troubleshooting and Beginner Help 4 02-08-2010 03:04 PM
More questions about macro lenses. chinotenshi Pentax SLR Lens Discussion 9 11-24-2009 08:51 PM
Have questions about 6x7 lenses MightyMike Pentax Medium Format 14 06-21-2009 09:44 PM
Metering with M/K Lenses On The MZ-50/ZX-50 (and other questions) lithos Pentax Film SLR Discussion 3 09-04-2008 10:04 PM
Questions on Lenses Brainless Pentax SLR Lens Discussion 3 05-27-2007 06:00 AM

All times are GMT -7. The time now is 06:20 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]