14 hours ago
|
Re: Help me understand f number with constant aperture zoom lenses
In reply to Gweedz,
10 months ago
|
Gweedz wrote:
My understanding is at 50mm focal length, the aperture is 17.8mm diameter (50/2.8), and at 17mm focal length the aperture is 6mm dia.
No, the 17.8mm is the diameter of the entrance pupil, the projection of the aperture.
--
last photo report:
http://photo.nagykrisztian.com/events/airshow2012uk/main.php
the browser based optical simulation tool
http://nagykrisztian.com/synthrays/
| Post (hide subjects) | Posted by | When | |
|---|---|---|---|
| 10 months ago | |||
| 10 months ago | |||
| 10 months ago | |||
| 10 months ago | |||
| 10 months ago | |||
| 10 months ago | |||
| 10 months ago |
   |
|
Connect with dpreview
|
