Replies to This Discussion

Permalink Reply by Amr Ellaithy on March 1, 2016 at 9:30am

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

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Permalink Reply by Oded Edgar Kindermann on September 3, 2016 at 2:03pm

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

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Permalink Reply by Amr Ellaithy on September 3, 2016 at 4:17pm

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

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Permalink Reply by Deborah Carlson on August 28, 2017 at 9:12pm

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!

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Permalink Reply by Joe Dunfee on March 2, 2019 at 12:01am

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

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Permalink Reply by Joe Dunfee on March 3, 2019 at 4:36pm

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

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Permalink Reply by Joe Dunfee on November 4, 2020 at 11:46pm

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.

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