benweblight Posted January 29, 2004 Posted January 29, 2004 which are the best profiles for gobo projection from quite a large distance, 18-20+
Tom Posted January 29, 2004 Posted January 29, 2004 18-20+ whats? Feet? Meters? Degrees? Source 4s (come in 5 and 10 degrees) are generally good for gobos, as are (I'm told, not used them) Juliats.
Bryson Posted January 29, 2004 Posted January 29, 2004 Feet or metres? It makes rather a lot of difference! Basically what you need to do is a bit of trigonometry. Take the distance from the stage, decide how big you want the projection to be, draw it and either calculate the angle at the source or draw it to scale and measure it. That'll give you the requisite angle. Anyway, depending on the answer to the above, most people agree that ETC Source 4s or Strand Sls offer the best gobo projection (I myself am a fan of the Strand zooms, but have to concede that the Source 4 fixed angles do project better gobos.) They're readily available in hire stocks around the country, so you shouldn't have any trouble finding them. They come in 50deg, 36deg, 19deg, 10deg or 5deg. (Anyone know how to do degree symbols?) The 5's and 10's will cost extra and they're a lot larger. The Source 4s are also available in a 750watt version that's a fair bit brighter. If you want the image super-super sharp, and aren't too bothered about losing a bit of brightness, use a "Donut" which is a plate with a smallish hole cut in it that slips in the gel frame slot. If it's a really long way, you may need something with more "ooomph". Something like a 2k Juliat profile or even a discharge lamp in a specially modified Juilat may be the way forward. I don't really use these sorts of things, so perhaps someone else can recommend if you do need to go all the way up to these things?
benweblight Posted January 29, 2004 Author Posted January 29, 2004 metres, nice degrees would be good
Bryson Posted January 29, 2004 Posted January 29, 2004 Sorry Ben, I don't understand your last post. Could you elaborate please?
Ben Posted January 29, 2004 Posted January 29, 2004 I think he means the original numbers were in metres but if people could give some angles for the best results that would be good aswell
Tom Posted January 29, 2004 Posted January 29, 2004 No, I think he means his original numbers were in metres and that the ability to post using a degree symbol would be good. Who said punctuation and sentence construction were not important.
SceneMaster Posted January 29, 2004 Posted January 29, 2004 Don't go for CTC Minuets I using them at the moment and the image is not the best although this may be the lights I am using. :blink:
Stu Posted January 29, 2004 Posted January 29, 2004 I can't recommend not using Source Four 5 or 10ºs enough - the optics on them are awful in comparison to the normal lens (19-50º). I think it must be that plastic lens, but whatever it is, it's horrible. How about some Strand Alto 8/16s? Or the 2k Juilats are nice - not sure what flavours they come in tho. Stu
P. Funk Posted January 29, 2004 Posted January 29, 2004 eugh minuettes. have some at school and, to be frank, when you have more than 2 other pars on stage you cant tell they're on. pathetic output! nice and small though :blink: ben... it depends how big you want the image to be, surely? quick way of working out what angle you want to project an image: angle of lens = inverse tan (0.5(size of image on stage) / length of throw) make sure your calculator is set in degrees say I want a 3m wide image from a 10m throw: lense angle = inverse tan(0.5(3) / 10) = inverse tan(1.5 / 10) = inverse tan (0.15) = 8.53 degrees
NickGale Posted January 30, 2004 Posted January 30, 2004 If you want to project Gobo's then you need a lens tube with GLASS lenses! Look at the Selecon Pacific 5.5 - 13 zoom. More info at Selecon Pacific VNZ If you want a loan / demo let me know Cheers Nick GaleUK Sales Manager Selecon
robloxley Posted January 30, 2004 Posted January 30, 2004 Don't go for CTC Minuets I using them at the moment and the image is not the best although this may be the lights I am using. :blink:Are they the simple reflector version or the condenser version (which is a phenomenal improvement and actually pretty damn good for a 0.5k). Obviously a number of 1k pars will outshine a 500/650W lantern...
benweblight Posted January 30, 2004 Author Posted January 30, 2004 thanks, nick, ill consider it talking about image it dosent need to be too big, kind of medium size (sorry, not that specific)it would be projected onto a projector screen, reason for long throw is the venue has a followspot 'balcony' (ontop of the control room :(), and thought I t owuld be a god idea to use that instead of foh bar
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