Selecting a projector for Spherical mirror System

Views: 1133

Reply to This

Replies to This Discussion

Sony VPL-DX127 - 2,600 Lumens XGA Desktop Projector ? is it Good ?

Hi, did you buy this projector already? how is it working?... I also have a mirror for my Dome

Hi , no , actually i bought epson x32 full hd , and it works well . Actually mr.paul bourke add my projector to his blog abou the sphemir syatem , if u need any help just let me know ...good luck
I cannot find this projector online anywhere. Can you post a link? I am looking for an inexpensive projector just to get started with my portable dome.
Thanks!

I know this is an old thread. But, the topic is certain to always be current, as projectors are constantly changing.

I am looking for a projectors to use with a spherical mirror.  There is one thing I have not been able to discover.  Where does the projector focus?  Very early in my investigation, I had assumed that the projector would focus on the distance from the lens, to the mirror, and then to the surface of the dome. But, I quickly realized that this would only be true for a flat mirror, and that the spherical mirror would change things.

I want to be confident I purchase a projector capable of focusing at that distance. Is there a general rule about how to calculate the actual focus distance?  

Thank you for any advice or information.

-Joe

I eventuallycame up with the correct search terms to find the answer. Paul Bourke commented on another thread ,Please;

" note also that the choice of projector has focus constraints. Assuming you are using the normal 60cm mirrors, then your projector needs to be able to focus on a flat wall such that the image is around 45 to 50cm wide. Whether you achieve this with projector position or zoom doesn't matter."

-Joe

I don't have a definite answer on the focus issue. But, there is no question that you do need to take the projector towards the extreme close-up end of the focus range. I've been experimenting with a security mirror with a fairly gentle curve, rather than a half-dome. But, I hope to obtain one and finally know, by trial and error.

Reply to Discussion

RSS

Fulldome Wikipedia Entry

IMERSA

This site is proudly sponsored by IMERSA members.

Fulldome Database

Blog Posts

PIANO UNDER THE STARS

IMPORTANT NEWS we are very happy, with the results after long work and effort to achieve Fulldome film for 360 degree dome theaters and planetariums. It started in May 2020 winning the most important and prestigious festival on the planet awarded…

Continue

Posted by Claudio Recabarren Madrid on August 21, 2021 at 6:58am

A New Exoplanets Show From Loch Ness Productions

EXOPLANETS - Discovering New Worlds

Welcome to the Great Age of Extrasolar Planet…

Continue

Posted by Mark C. Petersen on June 15, 2021 at 3:11pm

Introducing: DOME SHOWS AT HOME - Planetarium Shows On Demand For Home Viewers

FULLDOME OnDemand has been streaming quality fulldome content to theaters around the world since 2015.

Now, we are pleased…

Continue

Posted by Mark C. Petersen on March 16, 2021 at 10:30pm

Join us for an IMERSA Master Class with Doug Trumbull

Join us for an IMERSA Master Class in the history and techniques of…

Continue

Posted by Dan on February 4, 2021 at 1:35pm

© 2021   Created by Dan.   Powered by

Badges  |  Report an Issue  |  Terms of Service