2019年8月6日 · It depends upon the filter; there are many "red" filters each with a different filter factor. B+W lists two red filters for black and white - 090 filter a Wratten 25 equivalent with a filter factor of approximately 5 (2 1/3 stops) and a darker 091 a Wratten 29 equivalent with a filter factor 8 (3 stops). You are in the right ballpark.

2006年3月6日 · From my experience reddish or orange light streaks on color slides or prints in most cases are caused by light leaks. The light coming from the back side of the film has to cross the red filter layer (which is washed out during processing in case of …

2018年10月28日 · You can't develop any modern film under a red safelight.' Surely it is only loading the tank that has to be done in complete darkness - once this is done, the rest can be carried out under a safelight, domestic lighting or the glare of the noonday sun (assuming the tank is completely light-tight, of course !). I agree about the red swing filter.

2011年9月12日 · <p>I've used two or three stacked filters for special effects, including a yellow, orange or red filter along with a polarizer. The trick is to use good quality filters that are clean, along with a lens hood or other method for shading the lens (a dark hat is good). Avoid shooting into the sun, bright lights at night or reflections from windows ...

2004年6月2日 · Now, as to your question Tim. Any form of light that strikes the film and has in it a wavelength complementary to the dye will initiate fading. Red light fades cyan dyes, etc. UV light fades all dyes, and infra red (heat) fades all dyes. The question is, how fast.

2004年1月2日 · A color meter could be used, but this is a starting point, as its never really known how the emulsion will react, or how things will appear under various light sources*. IMHO, color meters work best outdoors - especially for people (models, clothing, etc), which are often shot as the sun rises or sets, and the color changes dramatically.

2021年1月12日 · That is, red is a naturally dark color. (Consider a red, white, and blue flag. The blue should. be darkest, the red somewhat dark, and the white light. If the red isn't dark, it will. look wrong.) If you meter through a red scene, then the whole scene is red, and a correct exposure meter. will make the whole scene dark.

6 天之前 · Create an account or sign in to comment. You need to be a member in order to leave a comment

2018年11月29日 · You need to be careful to shade the filters in many shooting situations. The large air space between filters allows sun or even lamp light to get behind the filters and bounce around. Sometimes this only reduces contrast but others it can cause more serious (or interesting depending on your view) problems.

2008年12月1日 · A KODAK WRATTEN Gelatin Filter No. 25 (red) works well for most daylight applications. This filter blocks UV radiation and blue light; however, it passes red light that allows visual focusing. If you want to record only infrared radiation, use a filter that blocks all UV and visible radiation, such as KODAK WRATTEN Gelatin Filter No. 87, 87C ...