Digital slide shows

Mitzi

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4 Jan 2006 - 12:16 AM

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I was brought up in the days of 35mm slides and a Kodak Carousel projector. What is the deal with digital? Is it possible to create a slide show in some way out of digital images and still project onto a white surface or does one need a very expensive plasma style screen?

ellis rowell

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4 Jan 2006 - 1:34 AM

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You will be pleased to know that digital images (via a digital projector) can be projected onto any light coloured surfaces. I frequently attend meetings where presentations are given, but if you want colour accuracy then a white surface or better still, a glass beaded screen (circa 1960's) is the way to go. I use a free standing beaded screen which I used with my film projector (it's now over 40 years old). I do find that digital images tend to be over exposed for projection, so I usually darken them slightly. Of course, the big advantage with digital is that you can crop, clone or erase unwanted parts out. It is always best to finish up with a 4:3 (landscape) image as this fits the projector "gate", try to avoid 3:4 images where possible as this results in a smaller image on screen. You don't actually need any special software as Windows XP viewer will do it.

PeterLondon

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4 Jan 2006 - 2:02 AM

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Be aware of the cost of replacement bulbs for digital projectors. I have a Sony which I use for home cinema. The bulb is lifed at 1000 hours (even at that useage the brightness is much reduced) and a replacement in the UK costs 570. In the end I was lucky that a friend travelling to the US found one there much cheaper.

ellis rowell

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4 Jan 2006 - 2:25 AM

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Come on, Jas, they were not that expensive. These digital lamps cost over a months pension.

I had a 300w film projector and the lamp blew in 7hrs. I thought sod this, and fitted a Brimistor in the circuit. The next lamp lasted years, in fact I never replaced it. Sold the projector to a friend eventually. Why don't the manufacturers fit Brimistors in the circuit.

For those that don't know what a Brimistor is. It is a resistor that has a high resistance when cold and as it warms up the resistance falls to nil. So it absorbs the switch on shock.

ellis rowell

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4 Jan 2006 - 2:48 AM

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Jas,

I wonder if this modern technology includes a type of Brimistor, 1000 to 3000hrs life seems a lot for this type of lamp. If I remember correctly, I think the life used to be about 300hrs.

Incidentally, when I bought my digital projector the cost of bulb replacement was a key factor.

ellis rowell

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4 Jan 2006 - 3:15 AM

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Ah! So that's how they get the long life.

Just Jas

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4 Jan 2006 - 3:30 AM

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A four terminal output for remote sensing is standard on the main output.

jas

Mitzi

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4 Jan 2006 - 5:57 AM

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I knew that I would get some replies to my query! This is the use of the Web and it is quite marvellous compared to how things were only a few years ago.

The need for some kind of digital projector is to project slides to do with aviation ground school. A picture can be worth a thousand words and I think they could transform the arduous task of passing ground school exams. I recall dropping a carousel loaded with slides many years ago and it was a real pain trying to get them all back in the correct order. I am presuming that all projectors require is a pre-loaded DVD or CD? This would be much simpler and it would be possible to store originals in a computer and then quickly and easily prepare discs for particular purposes? This sounds like a good deal!