Fortunately, infrared imagery using a digital SLR is possible by simply placing an infrared filter
over your lens, (just as you would do for a 35-millimetre camera loaded with infrared film).
- Electronic condenser include an integral infrared filter
to prevent overheating of the cells;
An infrared filter
can be threaded into the front of the G3's 11/4-inch nosepiece, or into another set of threads on the G3 body just ahead of the optical window in front of the CCD.
Using a 14-inch Schmidt-Cassegrain, a monochrome webcam, and a 1-micron infrared filter
, Pellier imaged the nightside of Venus glowing right through the planet's clouds in May 2004, when Venus appeared as a 19%-illuminated crescent.
It was a regular 20D with a wider passband infrared filter
and other features added (S&T: November 2005, page 84).
Using an infrared filter
, Cassini can peer through Titan's opaque haze to glimpse the surface below.
Thus, the infrared filter
is simply a "must-have" when working with such lenses whether the imaging is in black and white or color.
Thus, without the infrared filter
, a set of color-separation exposures of an object that emits infrared radiation would be contaminated.
Using a visually opaque infrared filter
in front of the CCD reveals an unfamiliar sky.