Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
06-03-2009, 05:05 AM   #1
Junior Member




Join Date: May 2009
Location: Melbourne, Australia
Photos: Gallery
Posts: 27
Theoretical limits...

So I'm a bit of a newbie to the 'technical' side of photography. I get the 'stops', shutter speed, ISO, and aperture part. I know what 'register' is, and how mirrored lenses avoid chromatic aberration. But I have a fairly simple question:

What creates the theoretical maximum aperture for a given camera?

In my head, aperture is related to the maximum amount of light a lens can admit, and (in theory at least) can't a lens be made to an arbitrary diameter with focusing optics 'bending' the light onto the film plane? Or is there some kind of physical restriction based on the 'cone' created by the register/mount diameter?

06-03-2009, 05:19 AM   #2
and
Veteran Member




Join Date: Mar 2007
Photos: Gallery
Posts: 2,471
afaik the size of the lens mount of the camera and registration distance limits the max aperture.
ive heard the canon ef mount is slightly larger and so it could accomodate a 50mm f1.0
canon had an f0.95 for rangefinder cameras because they dont have mirrors so the distance from the lens rear element and the film is very short
06-03-2009, 05:24 AM   #3
Site Supporter




Join Date: Sep 2006
Location: Mississippi, USA
Photos: Gallery
Posts: 545
I believe it has more to do with Price vs. Benefits, than the laws of physics.

f1.0 and f.95 lens have been made, extremely expensive for what you gain in
light gathering ability.
06-03-2009, 06:33 AM   #4
Junior Member




Join Date: May 2009
Location: Melbourne, Australia
Photos: Gallery
Posts: 27
Original Poster
f1.0 and f0.95 haven't been made for the pentax mount so far as I know. I heard this was related to the register distance (makes sense in a way...), but I want to know why? I'm interested in the theoretical limits (in this case...).

This would inform the price vs. benifits scenario (further from theoretical is easier), but what about mirror lenses? Cant they focus as much light as they want onto a focal plane?

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, diameter, lens, light, pentax help, photography
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Marketplace off limits? TourDeForce Site Suggestions and Help 10 07-31-2009 07:24 PM
Diffraction Limits revisited RioRico Pentax DSLR Discussion 48 05-25-2009 09:56 AM
limits of light metering...? filorp Pentax DSLR Discussion 6 02-13-2009 11:21 AM
Theoretical Lens Development gnaztee Pentax SLR Lens Discussion 4 11-24-2008 11:19 AM
Post Attachment Limits David Site Suggestions and Help 2 12-05-2007 12:28 PM



All times are GMT -7. The time now is 09:00 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