8mm Forum: Lamp Brightness ST1200 , GS1200

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Topic: Lamp Brightness ST1200 , GS1200

Graham Ritchie
Film God

Posts: 4001
From: New Zealand
Registered: Feb 2006

posted March 20, 2006 03:03 PM

Here are a few facts from a old Movie Maker mag you may find of interest.
Lamp Brightness Foot Candles
Centre Brightness Average(BSI)
ST1200 D 1.3 lens low 18
high 24
ST1200HD 1.1 lens low 25 19
high 31 24
GS1200 1.1 lens low 27 22.5
high 39 32.5

Graham

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Adrian Winchester
Film God

Posts: 2941
From: Croydon, London, UK
Registered: Aug 2004

posted March 21, 2006 05:08 AM

Can anyone explain why the latter two projectors have 2 figures for both low and high?

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Adrian Winchester

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Jan Bister
Darth 8mm

Posts: 2629
From: Ohio, USA
Registered: Jan 2005

posted March 21, 2006 06:56 PM

From looking at the numbers, I think I know... the sets of two numbers are meant to be values for both the respective machine's lens and a standard 1:1.3 lens (as found in the ST-1200D) so you can compare the two.

It seems to make sense: the 1200D and 1200HD both output 18-19 at low lamp and 24 at high lamp. But in addition, the 1200HD using a 1.1 lens rather than a 1.3 lens outputs 25 low and 31 high.

And again, the GS1200 using a 1.3 lens (but a stronger lamp) manages to produce 22.5 low and 32.5 high, or 27 low and 39 high with the 1.0 lens.

I guess that puts my own 1200HD (with Schneider 1.2 lens) at somewhere around 21 low and 25-26 high (my own estimate). Hmm, not bad, but suddenly the GS1200 is looking mighty good. [Eek!]

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Call me Phoenix. *dusts off the ashes*

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Graham Ritchie
Film God

Posts: 4001
From: New Zealand
Registered: Feb 2006

posted March 21, 2006 11:10 PM

Hi Jan and Adrian sorry for the confusion when I typed it I had two columns spaced apart one for centre brightness the other average (BSI)when I posted it everything came together [Confused]

there was no way of fixing it until someone replied sorry again.
ST1200D 1.3 lens lamp on low centre brightness was 18 on high 24 ST1200HD 1.1 lens on low centre brightness 25 on high 31 with a average(BSI)low 19 high 24, GS1200 1.1 lens on low centre brightness 27 on high 39 average on low 22.5 high 32.5.I hope it comes out right this time [Smile]

Graham

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Jan Bister
Darth 8mm

Posts: 2629
From: Ohio, USA
Registered: Jan 2005

posted March 22, 2006 11:11 PM

Ah, that's a bit different, but makes perfect sense.

Graham, you can always edit a post you just made, it's not necessary to wait for someone to add to the thread so you can reply to it. [Smile]

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Call me Phoenix. *dusts off the ashes*

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Winbert Hutahaean
Film God

Posts: 5468
From: Nouméa, New Caledonia
Registered: Jun 2003

posted March 27, 2006 04:50 AM

Can someone explain what that number means.

And can someone too convert that number to lumens since this measurement is used nowadays.

thanks,

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Winbert

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