Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
04-15-2008, 05:53 PM   #31
Pentaxian
falconeye's Avatar

Join Date: Jan 2008
Location: Munich, Alps, Germany
Photos: Gallery
Posts: 6,862
QuoteOriginally posted by mattdm Quote
(I'm interested to hear any tricks you might have, though.)
I found this formula quite usable:
H ~= 1730 a T
(T = f/d is the "tele factor" being ~1 for a normal lens and ~4 for a 200mm/135mm crop tele)
(d: sensor size in mm, f: focal length, a: aperture in mm = f/F, H: hyperfocal distance).
1730 reproduces the marks on Zeiss lenses.


Example:

135mm tele at f/16:
(a = 135mm/16 = ~8.5mm, T = 4 for APS-C)
H ~= 1730 * 8.5mm * 4 = 59m

But a fast guess would be 2000*10*4 = 80m which is good enough.

05-16-2009, 04:48 PM   #32
Site Supporter




Join Date: Mar 2008
Location: Prince George, BC
Photos: Gallery
Posts: 2,255
Hey, Matt. Here is one of your hi-tech wonders

Jack
Attached Images
View Picture EXIF
PENTAX K20D  Photo 
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!
aperture, camera, distance, dslr, idea, mode, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
An idea I'm surprised hasn't been implemented yet—Mv mode deadwolfbones Photographic Technique 35 10-05-2010 03:37 PM
Camera veteran, almost new to flash, and I have this crazy idea... Steve Beswick Flashes, Lighting, and Studio 7 12-02-2009 08:56 PM
The Future is here: The Camera that makes calls kevinschoenmakers Non-Pentax Cameras: Canon, Nikon, etc. 0 09-29-2009 11:45 PM
Off -camera flash idea.... MJB DIGITAL Flashes, Lighting, and Studio 4 03-30-2008 06:36 PM
Camera bag idea sought doggydude Pentax Camera and Field Accessories 13 08-19-2007 05:34 PM



All times are GMT -7. The time now is 12:05 AM. | See also: NikonForums.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