Daniel Madsen Posted March 10, 2007 Share Posted March 10, 2007 What is a relay lense? That is all. Link to comment Share on other sites More sharing options...
chuck colburn Posted March 10, 2007 Share Posted March 10, 2007 What is a relay lense? That is all. Hi Danielle, Most times, relay optics are used to move the image a given distance without changing the size of the original. Chuck Link to comment Share on other sites More sharing options...
Daniel Madsen Posted March 11, 2007 Author Share Posted March 11, 2007 and why would you use such a thing? Link to comment Share on other sites More sharing options...
Mike Rizos Posted March 11, 2007 Share Posted March 11, 2007 A viewfinder extension uses them. Link to comment Share on other sites More sharing options...
Premium Member Phil Rhodes Posted March 11, 2007 Premium Member Share Posted March 11, 2007 A lense is a spelling mistake. A lens is a piece of optical equipment. Phil Link to comment Share on other sites More sharing options...
chuck colburn Posted March 11, 2007 Share Posted March 11, 2007 A lense is a spelling mistake. A lens is a piece of optical equipment. Phil Jeeeeze Phil, Picky picky picky LOL And if you want to get right down to it, a lens is a component of a given piece of optical equipment. Chuck Link to comment Share on other sites More sharing options...
Rob van Gelder Posted March 11, 2007 Share Posted March 11, 2007 instead of picky remarks or correct but vague descriptions........ A relay lens is often used in snorkel lenses or boroscope and periscope and endoscope lenses (assemblies ;-) ) It brings the image further away from the first focal plane, normally with a 1:1 transfer ratio. That way, you can make lenses that can fit is small holes/tubes/cavities or have wide angle macro lenses with an extension tube (relay lens) that brings the camera further away from the object, so you have less shadow and a better chance to light the subject. Link to comment Share on other sites More sharing options...
chuck colburn Posted March 11, 2007 Share Posted March 11, 2007 What Rob said. Oh yeah and everybodys favorite, the proctoscope! OUCH Link to comment Share on other sites More sharing options...
Rob van Gelder Posted March 12, 2007 Share Posted March 12, 2007 i didn't go into detail about the "cavities" :D Oh, one important thing to remember: relais lenses loose a lot of light when moving the image further. 3 to 5 stops is not unusual and so you can have a 2.8 lens on the front but still an effective opening of 8 or 11. And then they are not even on their best in optical performance, stop down (on the relay lens, not the front lens!) to 22 to 45 for best results. Oh, let's not forget that many of the older systems need to be completely clean or you will see every speck of dust on your final image. nightmares.......... :blink: Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now