Infrared Imaging

Because CCDs are sensitive to the (near) infrared (IR), imaging in this part of the spectrum is remarkably easy. I use a simple Hoya IR filter bought from a camera shop. This filter appears as black glass, as it transmits no visible light, making it the ultimate light-pollution filter! Amazingly it gives your telescope remarkable penetrating power. Galaxies hidden behind the Milky Way, such as the Maffei/IC342 Group and their faint companions, can be successfully recorded from light-polluted sites (Figures 9.10 and 9.11). Many of these are so faint they have only been recognized in the last 10 years - yet we can image them! The Quasar images (Figure 9.1) are another example - their high redshift carries their peak emission point (Lyman Alpha) into the near infrared - perfect for us! This is what I meant by being smarter in image choice.

Hickson 57

Copland's Septet

Hickson 61

TheBox

HTckson 79

Seyfert's Sextet

Figure 9.14.

Selection of Hickson Compact Galaxy Groups.

Figure 9.15. NGC2174 - mosaic of four sets of images and LRGB color. FLI Maxcam and 16-inch Newtonian.

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Digital Camera and Digital Photography

Digital Camera and Digital Photography

Compared to film cameras, digital cameras are easy to use, fun and extremely versatile. Every day there’s more features being designed. Whether you have the cheapest model or a high end model, digital cameras can do an endless number of things. Let’s look at how to get the most out of your digital camera.

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