Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
11-04-2008, 04:06 AM   #16
Forum Member
brownargus's Avatar

Join Date: Sep 2008
Location: Rotherham, South Yorkshire, UK
Posts: 55
QuoteOriginally posted by Sean Nelson Quote
I think you're mistaken there. Cropping is exactly the same as using a longer focal length lens - if you crop the image so that the subject fills the frame it's going to have the same depth of field as if you had taken it with a focal length long enough to have the subject fill the frame (assuming the same f/number was used for both shots).

Have a look at my two macro pictures posted above. In the full-frame version the bee looks to be mostly in focus, but in the cropped view you can see that only part of it is.
Sorry, you misunderstand. The attached two shots, scanned from slides, illustrate. The first was taken with a 105 macro lens at a distance to fill the frame; the second was taken with the same lens at a distance away and the final shot cropped about 2/3rds to give an image size similar to the first shot. You will see that in the first image the antenae are out of focus whilst in the second they are sharp to the ends. Sorry about the quality of the slides, they are quite grainy from using 400 ISO film.


Attached Images
11-04-2008, 04:35 AM   #17
Site Supporter
Douglas_of_Sweden's Avatar

Join Date: Apr 2008
Location: Stockholm
Photos: Gallery
Posts: 3,353
QuoteOriginally posted by impete82 Quote
i had a 70-300mm and am waiting for my 18-250mm and can take some nice macro shots with that considering the zoom is fairly big. i'm curious to know how exactly you can shoot macro with a 50mm or 35mm and still be able to get wicked crisp images of animals like bees and others that move when you get too close :S
It helps if they move very slow because of low temperatures in the air. It is sad, but I found this bee on my car window a few weeks ago. It was too cold to move with any speed. Now it is probably dead. I'm happy to be a mammal when the winter comes. DA35/2.8 macro limited hand held. Some cropping. Had to live with short DOF since there were no way to put the tripod on the car hood.

It also helps if they are slow animals from the start! Same lens.

Last edited by Douglas_of_Sweden; 11-04-2008 at 04:36 AM. Reason: minor display detail

  • 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, macro, pentax lens, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
My Favorite Focal Length Lens for Shooting Beauty benjikan Photographic Technique 5 09-09-2010 08:59 PM
What does the DSLR do with the focal length info when using MF lenses? Ari Freund Pentax DSLR Discussion 15 02-25-2010 07:38 AM
Why don't DX and EF-s lenses show appropriate focal length? jct us101 Non-Pentax Cameras: Canon, Nikon, etc. 19 09-09-2009 03:45 PM
Need to Change Lenses for Complete Focal Length? 68wSteve Pentax SLR Lens Discussion 7 07-08-2009 08:00 AM
Input focal length for MF lenses NicholasN Pentax DSLR Discussion 2 07-16-2008 06:58 PM

All times are GMT -7. The time now is 05:19 AM. | 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]