timbo343 Posted July 20, 2021 Posted July 20, 2021 We currently have a Short Throw projector in the main hall projecting on to a 3m wide 4:3 screen (the width of the image is about 2.7m) The projector is an old NP600S at 2600 lumens and is showing it's age. The projector is currently around 2.7 - 2.8m away from the screen. We have been looking options but we are struggling to find a suitable projector as a replacement. The main hall has a pelmet hanging from the ceiling which is located about 2.25m away from the screen and there are LED lights at 1.8m from the screen. A projector with a throw distance of up to 1.5 - 1.6m would be ideal if there was such a thing. Can anyone help suggest a projector please? We would be looking at 3500 to 4000 lumens.
DaveTheTech Posted July 20, 2021 Posted July 20, 2021 Last lot of projectors I looked into were Casio, we went with LED verisons. Which I think were a fairly new thing - at least at an affordable price. The one for the hall was massive. I definately should have had help installing that one! Great projector, bright enough that we only needed to drop the lights at the front of the stage if we were watching a video.
robyholmes Posted July 20, 2021 Posted July 20, 2021 Can you do rear projection? We've done that on to a 4m wide screen using a Hitachi LED projector. It gets used as a backdrop for productions too as you get no shadow. Does need around 3.5m behide the screen mind.
hallb15 Posted July 20, 2021 Posted July 20, 2021 I've used avpartsmaster for years for all my projectors until we replaced them all with SMART interactive flat panels. https://www.avpartsmaster.co.uk/projector-i44 Also, projector central has good info on all projectors and their throw calculator is very useful. https://www.projectorcentral.com/projectors.cfm Or get in touch with Ross at VeryPC - he'll sort you out. https://very-pc.co.uk/verypc-for-education 2
VeryPC Posted July 20, 2021 Posted July 20, 2021 Thanks for the mention @hallb15 ! @timbo343 please feel free to drop us a PM if you need any further assistance after checking out the webpage that you've just been referred too! - Ryan 1
timbo343 Posted July 26, 2021 Author Posted July 26, 2021 Quick question... Would it make sense to get a 16:9 projector and run it in 4:3 mode until we are ready to move to 16:9. We then have essentially bought the projector and then we just need to upgrade the screen and then re-position the projector when ready? Bearing in mind we dont have the funds to replace the screen at the moment which is a 4:3 screen and the available space above the stage is at a premium.
hallb15 Posted July 28, 2021 Posted July 28, 2021 It's an idea. Bear in mind that the diagonals of a 16:9 projected image will be wider than 4:3 when selecting your projector. Time for a bit of maths... 4:3 ratio is 1.33 to 1. So if your current screen is 3M wide, then it's height must be 3 / 1.33M = 2.26M. Diagonally this is 3.76M (using Pythagoras) 16:9 ratio is 1.77 to 1. So to get the same 2.26M high image, the screen would have to be 2.26M x 1.77 = 4M wide. Diagonally this is 4.59M.
timbo343 Posted July 28, 2021 Author Posted July 28, 2021 It's an idea. Bear in mind that the diagonals of a 16:9 projected image will be wider than 4:3 when selecting your projector. Time for a bit of maths... 4:3 ratio is 1.33 to 1. So if your current screen is 3M wide, then it's height must be 3 / 1.33M = 2.26M. Diagonally this is 3.76M (using Pythagoras) 16:9 ratio is 1.77 to 1. So to get the same 2.26M high image, the screen would have to be 2.26M x 1.77 = 4M wide. Diagonally this is 4.59M. Thanks for the maths. We decided to stay with the 4:3 screen for now. The projector will allow for 16:9 / 16:10 (obviously not true wide resolution) but we don't have the budget to fork out for a screen that will give a 3m high image in wide screen. I worked it out (could be a little wrong with the maths) at a 240" diagonal image which is getting in to the cinema installs and trying to find a reasonably priced motorised screen that big is difficult. We would still be able to project a 3m wide image in widescreen on the 4:3 screen, it's just that when in wide screen it looks narrower. 1
Protec Posted August 2, 2021 Posted August 2, 2021 Most of the primary schools here had a standard Hitachi projector for the huge hall screen. They worked quite well. The projector in one was nearly flush to the ceiling so had quite a bit of keystone correction!
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