Why there is no such thing as a standard size gobo?
People often say they would like to order or make a standard size gobo. The problem with this is statement is, that there is no standard size for gobos. There are certainly some gobo sizes that are more popular than others, but there is no standard size in the Gobo world. Every lighting fixture that projects gobos, takes its own unique gobo size, although there are some crossovers in gobo sizes, most instruments take their own size.
When sizing a gobo, there are two measurements that are crucial, IA (image area) or VA (viewable area), and OD outer diameter. There are many websites online that provide lists of which lighting instruments take which gobo size and what the exact measurements are. There must also be a match between the gobo size and the correct sized gobo holder. This is also not a standard size. A good example of this is the ETC Source Four, which can take either a A size gobo holder or a B size gobo holder and also a glass pattern holder, so not all gobo holders are the same, or a standard size.
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New Source Four Mini at GoboMan.com $249.00
Everything you know and love about the Source Four scaled down and perfect for your venue. The Source Four Mini is a nearly exact replica of the Source Four, right down to the rotating barrel, shutters, gel frame and pattern holder, but with a 50 watt MR16 lamp.
The Source Four Mini can go where no full-sized Source Four has gone before. ETC’s 50-watt Source Four Mini features the same crisp optics, user-friendly functionality and sleek look of the legendary Source Four fixture, but in a compact format one-tenth its size. It’s the perfect fit for museums, stores, restaurants, lobbies, light labs, children’s theaters and other smaller-scale installations.
The Source Four Mini has four field-angle choices and comes in a portable version with a miniature C-clamp or a canopy-mount design with an integral transformer. Surprisingly bright for its size, the Mini offers crystal-clear image projection and a bright, even field.
It’s not a toy, it’s a Source Four.
19°, 26°, 36° and 50° field angles
9″ long, 2.5″ diameter
50W tungsten/halogen MR16 lamp with 4,000-hour life
Portable or canopy-mount versions
Track-mounted version available in summer 2013
E-size pattern holder
Gel media frame
Rotating barrel ± 25°
Three-plane stainless-steel shutter blade assembly
Tool-free lamp adjustment
Insulated rear handle
Rugged die-cast aluminum construction
Black, white, silver or custom colors available
Yoke-mounted 12V transformer in color-matched case
Miniature C-clamp included
3′ power cable and Edison plug
4.5 x 1.5″ color-matched canopy
Canopy-mounting hardware for 4″ ceiling junction box included
12V transformer in canopy for hardwired (120V or 230/240V) input
– See more at: https://www.goboman.com/item.asp?cID=45&PID=1426#sthash.8OFn6Rsn.dpuf