Filter queries

[roy2978]

Hey professionals and amateur out there, can someone help me as in what is the function of a warm-up filter and a UV filter?

Any website that provide photo examples....

 

[ChinShiong]

UV filter. Couldn't find warmup one...

 

[mervlam]

Warm up filters are splited into categories: 81 & 85

81A, 81B, 81C are light balancing filters used to decrease the color temperature slightly for a warmer (redder) tone. Corrects the tendency toward bluish tones. For example, the 81A should be selected when using tungsten Type B color film (3200°K) with photoflood lamps (3400°K) These filters can be used together.

85, 85B, 85C are color conversion filters for the use of tungsten type color films in daylight. 85 decreases the color temperature from 5500°K to 3400°K for the use of Type A color films. 85B decreases the color temperature from 5500°K to 3200°K for the use of Type B color films. 85C decreases the color temperature from 5500°K to 3800°K. The effect obtained is the same as with daylight type color films used in daylight.

Source: http://www.thkphoto.com/products/hoya/index.html

 

[shuy]

can they both be replaced by photoshop?

 

[mervlam]

Originally posted by shuy
can they both be replaced by photoshop?

unless you are film user, i think. and besides that, there is white balance on most digital cameras.

 

[willageeboy]

Some places need warming up, such as cities where there is a lot of concrete. I use an 81A all the time as portraits work better with them generally. If you are using digital then this is not a problem. I used to always shoot a white card for the first frame of a shoot to balance any colour temp factors.

 

[MoriMori]

This page should help

http://www.ephotozine.com/techniques/viewtechnique.cfm/recid/259