Simviation Forum - Nikon DX Lens f/stops

	Search the archive:

Simviation Main Site | Site Search | Upload Images

Simviation Forum › Graphic Gallery › Photos & Cameras › Nikon DX Lens f/stops

(Moderators: Mitch., Fly2e, ozzy72, beaky, Clipper, JBaymore, Bob70, BigTruck)

‹ Previous Topic | Next Topic ›

Pages: 1

Nikon DX Lens f/stops (Read 208 times)

Apr 25^th, 2007 at 7:11am

martianfrogz Offline
Colonel
Queen Rocks!

Gender:
Posts: 141

Does anybody know why the Nikon DX lenses only go to about f/3.5? Why have they stopped going up to f/2.8? I've heard, and am guessing myself, that the DX lenses aren't of as high quality as the "normal" film lenses. It's all a question of depth of field and aperture. Thanks!

&&Currently flying around the world! Coming to an airport near you!!!

IP Logged

Reply #1 - Apr 26^th, 2007 at 7:58am

Brett_Henderson Offline
Colonel
EVERY OUTER MARKER SHOULD
BE AN NDB

Gender:
Posts: 3593

I can't answer that question.. but can't you use the better, Nikon AF lenses on a camera that accepts the DX lenses ?

Maybe the "DX" is a digital, budget line ?

IP Logged

Reply #2 - Apr 28^th, 2007 at 3:24am

Ivan Offline
Colonel
No, I'm NOT Russian, I
only like Russian aircraft
The netherlands

Gender:
Posts: 6058

martianfrogz wrote on Apr 25^th, 2007 at 7:11am:

less f = more weight...
so its a reasonable guess that the frame gets damaged by a heavier lens.

I've seen a 2.8 fisheye somewhere but i dont know if that one is available where you live.

Russian planes: IL-76 (all standard length ones), Tu-154 and Il-62, Tu-134 and An-24RV&&&&AI flightplans and repaints can be found here

IP Logged

Reply #3 - Apr 28^th, 2007 at 6:22pm

microlight Offline
Colonel
It's a bird...
Southern UK

Gender:
Posts: 2236

It's nothing really to do with the quality of the lenses, or even the amount of glass in them - it's more to do with their complexity. For example, a macro zoom lens has to do more mechanically than a fixed focal length non-macro lens. Since f-stops are a measure of light transmission, the more a lens has to do, then the less its maximum aperture is likely to be. So in 35mm terms, a 50 mm standard lens may have a maximum aperture of say f1.7 (which means that the amount of light leaving the rear of the lens is 1/1.7 of the light that entered the front of the lens) whereas a zoom which includes 50mm as part of its range (say 35-70mm) may have a maximum aperture of f3.5 or f4 because the mechanical complexity is such that the lens may not be physically capable of transmitting the amount of light that a fixed-focal-length lens could.

Any clearer?

Wink

BAe ATP for FS9 now available! www.enigmasim.com

IP Logged

Pages: 1

‹ Previous Topic | Next Topic ›

« Home

‹ Board

Top of this page