Patterns, or gobos, are widely used by designers in theatre, film, photography and television to create atmosphere, project scenery, and generally enhance the visual impact of their lighting.

Conceived by some of the world's leading lighting designers, the Rosco range presently includes hundreds of standard steel gobo designs.

To insure design integrity the patterns are etched using a precise double-sided process on stainless steel. The result is durable, high quality patterns which will withstand the extreme heat at the gate of ellipsoidal spotlights.

Rosco steel gobos are round to allow for rotation in the gate when aligning the projected image.

The standard "B" size is suitable for most fixtures with a 6" lens when used with a Rosco Pattern Holder or the holders of other manufacturers.

Trimming of patterns, where necessary, can be easily accomplished with a pair of scissors.

Related Questions and Answers

Q: 1. Does it have IS? Want to find good lens for BMPCC

A: Unfortunately, the Canon EF 17-40mm f/4 USM is not image-stabilized.

Q: 2. Can this be used with Canon Rebel

A: Yes it can be used with Canon Rebel models (film and digital). The Canon 17-40mm f4 USM L series lens is compatible with all Canon EOS cameras (film and digital).

Q: 3. is this lens compatible with canon t5i?

A: Yes. The t5i is compatible with EF (full framed) lenses.

Q: 4. Can I use the EF 17-40 f/4L on my 5D SR (with tripod) for Astrophotography?

A: The Canon EF 17-40mm f/4L USM Lens is fully compatible with the Canon EOS 5DS R. This is a good wide angle lens option for astrophotography.

Q: 5. does focus changes alot when you zooming?

A: The EF 17-40mm f/4L USM is a parfocal lens.

Q: 6. can I use it with the C100 mark II ?

A: EF lens mount, so yes.

Q: 7. The canon site states this lens can be used with the extender 1.4x and 2.0x is this correct?Pete

A: Teleconverters are not compatible with lenses with a focal length wider than 70mm, including the Canon EF 17-40mm f/4L. The Canon website specifies that this lens can be used with extenders, meaning extension tubes. Those extension tubes are the Extension Tube EF 12 II http://bhpho.to/VMSt9k and the EF 25 II: http://bhpho.to/1tyEhgB

Q: 8. Can I use this lens on my Canon SL1 camera ?

A: Yes

Q: 9. i want to combine this lense with the sony a6000 with sigma mc 11 adapter . or should i just get the sony 10 18 mm . thanks

A: Generally native lenses work more smoothly than non-native lenses with adapters. Also best in mind that the a6000 is an APS-C camera so the 17-40 will become a 27-64mm equivalent lens on the a6000 (give or take a few mm, depends on exact APS-C sensor size)TL;DR 10-18

Q: 10. Is this a good zoom lens for shooting in limited light, such as an auditorium or in a theater without a flash?

A: I would recommend purchasing the brightest lens possible for your stated usage needs. Of the options we carry with a similar focal length and which would be compatible for use on the Canon EOS Digital Rebel T5i DSLR camera, I would recommend the Sigma 18-35mm f/1.8 DC HSM Art Lens for Canon EF, B&H # SI183518DCC, for your usage needs. The constant f/1.8 aperture is 2.3 f-stops brighter than the f/4 aperture used on the Canon EF 17-40mm f/4L USM Lens. As an example, if your shooting conditions require you to have an exposure of f/4 at 1/13 sec. to get a properly exposed image, and there is a chance you can get blurred images due to a slow shutter speed, the Sigma lens would give you the ability to shoot an equivalent exposure of f/1.8 at 1/60 sec., which is much faster to hand-hold this lens at any of its focal lengths with minimum blur from hand movement. You may further use a higher ISO setting to assist in obtaining an exposure with a shutter speed fast enough for your specific lighting conditions. However, do note that the lighting conditions you list above are extreme, so you may need a higher-than-normal ISO setting, and which is why the brighter Sigma 18-35mm f/1.8 DC HSM Art Lens for Canon EF would be a better option for your indicated usage needs.