Filter queries

roy2978 · 19th April 2003

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 · 19th April 2003

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

mervlam · 19th April 2003

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 · 20th April 2003

can they both be replaced by photoshop?

mervlam · 20th April 2003

Quote:

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.

21st April 2003

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 · 21st April 2003

This page should help

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

19th April 2003	#1
roy2978 Member Join Date: Mar 2003 Location: Central Posts: 136	Filter queries 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....

19th April 2003	#2
ChinShiong Member Join Date: Dec 2002 Location: Russia Posts: 229	UV filter. Couldn't find warmup one...

19th April 2003	#3
mervlam Senior Member Join Date: Apr 2002 Posts: 2,422	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

20th April 2003	#4
shuy Member Join Date: Sep 2002 Location: Alpha Centuari Posts: 242	can they both be replaced by photoshop?

21st April 2003	#6
willageeboy Guests Posts: n/a	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.

21st April 2003	#7
MoriMori Member Join Date: Mar 2003 Posts: 202	This page should help http://www.ephotozine.com/techniques....cfm/recid/259