Quo Vadis Nex?

Started May 16, 2011 | Discussions thread
rrfischer Regular Member • Posts: 232
Re: Quo Vadis Nex?

gfrensen wrote:

Well YES when you want a fast lens you need large glass surfaces, so larger lenses.

Then to give a large FL the front lens has to be at a given distance from the sensor, nothing can be done about that ( or you have to make a miror lens or a colapseble one).

Distance of the front glass of the lens has nothing to do with its focal length. On a pin hole camera, the pin is at a distance from the film equal to the focal length. When you place a lens in front of the film, then the focal length is the distance from the film plane to a point where the light converges, which is also dependent on the shape of the lens. I guarantee you that my cheap Kalimar 500 mm refractor (not reflex) lens doesn't have half meter of length (about 35 cm actually, counting the registration distance).

Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow