mark_pohl Posted February 12, 2004 Share Posted February 12, 2004 hello, I've heard the term gels, what are they used for ? and are there diff. types ? Also, If I wanted to knock down the intensity using ND filter, how do you buy these and do they attach to the flash ? Thanks in advance !! Link to comment Share on other sites More sharing options...
yance_marti Posted February 12, 2004 Share Posted February 12, 2004 Check this thread: http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=007GPW I usually attach them to the flash using Scotch tape. Link to comment Share on other sites More sharing options...
EricM Posted February 12, 2004 Share Posted February 12, 2004 You can get gel�s for a variety of effects and purposes. Including your desire, ND, that comes in ND3 (-1/3 of a stop), ND6 (-2/3rds f a stop), and ND9 (-1 stop). Another common use for gels is colour correction, for tungsten and daylight light sources to balance for tungsten and daylight film. They are CTO, orange gels to correct from daylight (daylight light balanced source) for tungsten film. The counter part is CTB, a blue gel used on tungsten light to correct to daylight temp. You can use either of the CTO or CTB to go beyond or below correcting temperatures, and use them to warm or cool your lighting effects. The CTO and CTB come in 1/8, 1/4, 1/2, and �full�. These are the most common three forms of gels, there are however �minus green� for fluorescents or just for fun, as well as yellow, green, red, etc for stage lighting and theatre. Link to comment Share on other sites More sharing options...
peter_witkop Posted February 12, 2004 Share Posted February 12, 2004 Fot attaching gells to lights, I use cloths pins, it works. There is accutally a technical motion picture name for them (ec-10 clamp, something like that), but they're just cloths pins really. For attaching gells to on camera type flashes, small pieces of gaffers tape work well too. Peter Link to comment Share on other sites More sharing options...
mark_pohl Posted February 12, 2004 Author Share Posted February 12, 2004 thanks guys. Eric, Can you stack the filters to get more than -1 stop, say -1.5 stop ? Thanks Link to comment Share on other sites More sharing options...
timberwolf1 Posted February 12, 2004 Share Posted February 12, 2004 What most photographers call "gels" are really acetate filters. "Gels" were the things used in the early part of the last century to color theatrical lights. Today, a filter Gel exists to be placed between the lens and the film plane. Link to comment Share on other sites More sharing options...
_________1 Posted February 12, 2004 Share Posted February 12, 2004 "Including your desire, ND, that comes in ND3 (-1/3 of a stop), ND6 (-2/3rds f a stop), and ND9 (-1 stop)." Sorry Eric, you're way off base here. An ND3 is -1-stop, ND6 -2-stop, ND9 -3-stops, {and ND12 -4-stops}. These are DIN numbers which means that a ND3 is actually 10^(-0.3) = 1/2; ND6 10^(-0.6) = 1/4; ND9 10*(-0.9) = 1/8; and lastly ND12 10^(-1.2) = 1/16. 10^X means base 10 raised to the power of X. Link to comment Share on other sites More sharing options...
_________1 Posted February 12, 2004 Share Posted February 12, 2004 By the way, Lighting Gels are more often made of Mylar than acetate. Link to comment Share on other sites More sharing options...
yance_marti Posted February 12, 2004 Share Posted February 12, 2004 Timber, I think we are talking about filters for flash, not for the lens. Link to comment Share on other sites More sharing options...
_________1 Posted February 12, 2004 Share Posted February 12, 2004 And yes, Mark, you can add the ND gels, for example, two .3ND give you -2-stop ND. Link to comment Share on other sites More sharing options...
EricM Posted February 12, 2004 Share Posted February 12, 2004 "Sorry Eric, you're way off base here." I think "Eric, drink your coffee first" is more appropriate. I have no idea what i was thinking this morning... Link to comment Share on other sites More sharing options...
_________1 Posted February 13, 2004 Share Posted February 13, 2004 No worries, Eric, I act that way too without my morning cuppa. Just ribbing you, mon ami. Link to comment Share on other sites More sharing options...
mark_pohl Posted February 13, 2004 Author Share Posted February 13, 2004 Thanks again, You guys are great !! One last questions. how do you buy it? roll? is there diff in quality? Link to comment Share on other sites More sharing options...
EricM Posted February 13, 2004 Share Posted February 13, 2004 http://www.rosco.com/ Link to comment Share on other sites More sharing options...
mark_pohl Posted February 14, 2004 Author Share Posted February 14, 2004 Thanks Eric, I'll check them out. Mark Link to comment Share on other sites More sharing options...
EricM Posted February 14, 2004 Share Posted February 14, 2004 geez, i missed half of my post now... Mark, you can get them many places. They often end up in the garbage too, after shows, or if they've been used a few times. Pro's don't like the wrinkles and creases they sometimes get, so in the bin they go. And in the bin Eric goes after them! But to get familiar with what's out there, type 'Lee gel filters' or rosco into google for starters. Link to comment Share on other sites More sharing options...
timberwolf1 Posted February 19, 2004 Share Posted February 19, 2004 Rosco filters are sold in sheets which are about 20"x20" (guess). If they are mylar, fine, mylar does scratch as readiily as acetate. And yes, I am talking about filters for lighting. Early in the century gels were used for lighting, too. After using a colored filter, you may not need to use any neutral density filters. Link to comment Share on other sites More sharing options...
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