Specially manufactured for LEDs, this 24 x 24" Rosco OPTI-FLECS 1/4 CTO Filter has an amber hue and is mounted on a daylight balanced fixture to match it with tungsten-balanced lamp heads. The filter absorbs 0.4 stop of light.

0.4 Stop Light Loss

The low-heat feature of LED lights means that gel is not an expendable any more - it's an accessory, just like a scrim or a barn-door. OPTI-FLECS is a semi-rigid filter that offers cinematographers, gaffers and lighting directors a durable, reusable solution for correcting the problematic color-rendering aspects of LED lighting.

Related Questions and Answers

Q: 1. How does the aperture change with the focal length? (at 24mm, 28mm, 35mm and 50mm)

A: Aperture or F-stop is is calculated relative to the focal length of the lens. The formula is, focal length of the lens divided by the optical diameter of the lens. at 24mm the diameter is 6 = f4 The optical diameter can change as you zoom based on design. In this lens 50mm the diameter is 7.9 = f6.3 Note this is illustration is just to explain how we get f stop numbers I don't know the technical design of the lens.

Q: 2. Does this lens extend when zoomed or is it an internal zoom lens?

A: Panasonic Lumix S 24-105mm f/4 Macro O.I.S. Lens protrude outside the lens barrel between 118mm to 160mm.

Q: 3. Does this lens work with the Sigma fp L? Specifically, does the lens OIS work with the fp L?

A: The Panasonic Lumix S 24-105mm f/4 Macro O.I.S. Lens is compatible with the Sigma fp L Mirrorless Camera, The Lenses' image stabilization will work on this camera.

Q: 4. are these useable for LED panels?

A: It would require a frame to optimize the effect. These would narrow or widen the spread of the light but there is a significant reduction in the brightness of the light output. Even after purchasing these to use with LED PAR cans I have decided not to use them. They would probably be usable to create a very diffuse wash from the panels.

Q: 5. Do these work with Aputure barndoor system for 120dII and 300dII?

A: Unfortunately, this OCF II Gel in the Quarter CTO can only work with the Profoto OCF system.

Q: 6. Do OIS and SL2 body stabilization work together?

A: Unfortunately no, you can only use one stabilization system or the other.

Q: 7. If used on a Leica CL, does the image stabilization of the lens work?

A: Yes, the stabilization of the Panasonic Lumix S 24-105mm f/4 Macro O.I.S.will operate on a camera without stabilization.

Q: 8. Could be used directly in the Z 50 camera?

A: Yes this lens is fully compatible with the Z50.

Q: 9. Can I use this gel on a Aputure LS C300d II Daylight LED Monolight?

A: If you own either the MagMod Reflector XL, B&H # MAXREFL01, or one of the MagMod MagBox Pro softboxes using the MagMod MagBox Pro Speed Ring Adapter (Bowens), B&H # MAPRSRBOW01, then yes, the MagMod Dome Gel (1/2 CTO) may be used on the Aputure LS C300d II Daylight LED Monolight with the aforementioned accessories. It will not work on its own. https://bhpho.to/3fPjSnB https://bhpho.to/3uiGfZE

Q: 10. Will this fit on the Profoto B2 250?

A: No. The following unit is made and designed for use with the B10, B10 Plus, and B1X.