This Rosco #3204 1/2 Blue CTB Gel Filter Roll 48"x25'is traditionally used to convert tungsten lighting to daylight. CTB (Color Temperature Blue) filters are available in a full spectrum of degrees (strengths) which, depending on your needs, can be used to either raise the temperature of your lighting or to create different lighting interpretations.

CTB filters offer you complete control when shooting under tungsten lighting.

Heat Resistant    Deep-Dyed    Excellent Color Transmission

Related Questions and Answers

Q: 1. Are these stackable?

A: Yes, you can stack the E-Colour #209 .3 Neutral Density Filter.

Q: 2. Can this be used with hot lights without it melting/deforming too quickly?

A: The Rosco # 3208 1/4 Blue CTB Color Conversion Gel Filter (20 x 24" Sheet) is heat resistant however keep in mind that any gel gets deformed after a full day of work, especially if placed close to the source.

Q: 3. If you use window cleaner or clear sugary drink (as I've seen suggested here), how do you clean the gel after the shoot?

A: Truth be told you don't necessarily have to clean The Rosco E-Colour #211 .9 Neutral Density (48 x25' Roll) B&H # ROE211R48 MFR # 102302114825 after a shoot, but if you find that you do, what I suggest is to get the following 2 items. The former is less abrasive than a window cleaner and the latter is a nice Chamois cloth, good for a wide variety of cleaning tasks.Endust 16 oz Anti-Static Gel LCD & Plasma Screen Cleaner B&H # EN11308 MFR # 11308Japan Hobby Tool Chamois Skin (5.9 x 5.9 ) B&H # JAJHT9594 MFR # JHT9594

Q: 4. What size gels does this hold?

A: The Kupo Gel Roll allows you to keep gels and filters organized and safe in one neat roll when not being used. The unfolded size is 32in(L) x 26in (W) which is large enough to store up to 100 pcs. The additional pouch stitching on the roll allows you to keep the gels and filters in place. Meanwhile, the inserted gels and filters can be folded and rolled up into a 26in length with a 5in diameter cylinder, and can be rolled and securely closed with two Velcro-straps which are attached to the roll.

Q: 5. Would it be possible to leave the ND gel attached to the window for an extended period (for example, 1 year)? Would it stick for that long using the window cleaner solution attachment approach?

A: This ND has no adhesive.

Q: 6. I saw that this is also sold with a 1" core. What size of core is this one?

A: A 1" core is also used for this filter roll.

Q: 7. Hello! I am trying to take my 3000 K landscape light to a more warmer light like a 2700-2,500 K, like a regular halogen color. What would the 1/8. 1/4 and 1/3 get my Kelvin to? I bought the 223 1/8 but that didn't do much. Thank you!!

A: Full CTO will move the color temp from 5,600k to 2800k. 3/4 will do 5,600k to 3,200k. Smaller levels will do proportionally less.

Q: 8. Is there a half or full CTB?

A: No, we suggest using the following solution and pre-loading your own gels. Profoto OCF II Gel Ring BH #PR101040 • MFR #101040 https://bhpho.to/3WpAOnE

Q: 9. Is this the 'darkest/deep blue' version they have? Last blue gel I got (Lee 201 and 202) was far too 'white' for what i'm looking for. I want a deep blue

A: CTB is a correction gel it is not meant for adding color. If you want a rich blue color Primary Blue https://bhpho.to/31L7fky would be a good option.

Q: 10. How would this attach to a F&V Fighter 300 flash unit?

A: These can taped and wrapped to any configuration. I've even cut them to make filters for my PAR lights