Color Temperature Blue (alternatively, Correct to Blue). A range of color correction filters used to raise a source's color temperature. Available from all four major color filter manufacturers and also available in dichroic filters.
Full CTB will convert 3200K to 5700K
1/2 CTB will convert 3200K to 4300K
1/4 CTB will convert 3200K to 3600K
1/8 CTB will convert 3200K to 3300K
Some also offer 1/3, 2/3, and 3/4 varieties.
For more, see the links and attachments to the wiki entry color temperature. For the opposite, see CTO. Note that not all manufacturer's products are exactly equivalent.
Full CTB will convert 3200K to 5700K
1/2 CTB will convert 3200K to 4300K
1/4 CTB will convert 3200K to 3600K
1/8 CTB will convert 3200K to 3300K
Some also offer 1/3, 2/3, and 3/4 varieties.
For more, see the links and attachments to the wiki entry color temperature. For the opposite, see CTO. Note that not all manufacturer's products are exactly equivalent.