Is a Condenser Always Needed?

Luca Brazzi · 13th March 2005, 09:22 AM

Im planning on building a projector using a 7" lilliput and a 250 watt double ended MH bulb.

Is a Condenser necessary?

Quin · 13th March 2005, 11:30 AM

From what I gather its more benificial to use one on a 7" or smaller project, to minimise light loss. I expect it'd still work quite adequetly without, but perhaps a shorter 220mm rear fresnel focal length would be in order.

dj_holmes · 26th March 2005, 02:11 PM

check out my link 5.6" screen with ohp. i posted my progress during my pj experience and right at the end it screen shots of condenser and wow. it really helps to direct most of the light to a point. its does help. i repeat it does help. maximise your pj man. but i used a 150 hqi 250 will be tooooo much with condenser wooooooowwwww

Luca Brazzi · 28th March 2005, 02:24 AM

But Which Condenser Lens?

I see lots of people using an 80mm diameter with 89mm fl....

But I cant seem to find that one anywhere... I have seen some larger with longer focal lengths though...

Does it really matter?

gazza · 28th March 2005, 08:08 PM

also people say you can use both dcx lenses and pcx lenses has any one used a dcx lens

13th March 2005, 09:22 AM	#1
Luca Brazzi diyAudio Member Join Date: Dec 2002 Location: VA	Is a Condenser Always Needed? Im planning on building a projector using a 7" lilliput and a 250 watt double ended MH bulb. Is a Condenser necessary?

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13th March 2005, 11:30 AM	#2
Quin diyAudio Member Join Date: Dec 2004 Location: England	From what I gather its more benificial to use one on a 7" or smaller project, to minimise light loss. I expect it'd still work quite adequetly without, but perhaps a shorter 220mm rear fresnel focal length would be in order.

26th March 2005, 02:11 PM	#3
dj_holmes diyAudio Member Join Date: Nov 2004 Location: london	check out my link 5.6" screen with ohp. i posted my progress during my pj experience and right at the end it screen shots of condenser and wow. it really helps to direct most of the light to a point. its does help. i repeat it does help. maximise your pj man. but i used a 150 hqi 250 will be tooooo much with condenser wooooooowwwww

28th March 2005, 02:24 AM	#4
Luca Brazzi diyAudio Member Join Date: Dec 2002 Location: VA	But Which Condenser Lens? I see lots of people using an 80mm diameter with 89mm fl.... But I cant seem to find that one anywhere... I have seen some larger with longer focal lengths though... Does it really matter?

28th March 2005, 08:08 PM	#5
gazza diyAudio Member Join Date: Oct 2004	also people say you can use both dcx lenses and pcx lenses has any one used a dcx lens

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