Assuming that we want to be able to image deep-sky objects (the most common targets for astroimagers) we can compile a list of the most common equipment and accessories used by beginning imagers and compare their total costs.  These are not the only possibilities -- rather they represent the most common methods of imaging the sky, especially for the beginner.

We will assume the use of the same telescope is each case.  For this example the most common telescope in amateur astronomy, a computerized 8" Schmidt-Cassegrain telescope, is used.  The reason for assuming a computerized "goto" telescope is to show the inclusion of an equatorial wedge, a common accessory.

CCD Imaging Equipment

One-Shot Color CCD Camera
Focal Reducer Lens
Equatorial Wedge* (not needed for some setups)
Laptop Computer

Digital Camera Imaging Equipment

Digital SLR Camera
Focal Reducer Lens
Guidescope
Mounting Rings
Dovetail Plate
Counterweights
Autoguider
Equatorial Wedge
Laptop Computer

Obviously, less equipment is required for CCD imaging since a separate autoguider is not necessarily required if used with a fast (f/3.3 or f/2) focal reducer (which would not be compatible with the digital camera).  If imaging with the HyperStar system, an equatorial wedge is not even necessary, so there is a potentially huge savings with a CCD versus a DSLR.  Not to mention that the exposure time is significantly reduced with a CCD camera.

Figure that an entry-level CCD costs around $700 and a HyperStar lens is $600 for an 8" SCT (the most common scope).  The laptops are a wash since both systems ideally use them.  (You can do DSLR imaging without a laptop, but it's a real pain and focusing is sheer guesswork.)  A typical price for the extra hardware needed for the DSLR setup is around $1500.  Digital SLRs start around the same price as CCDs, so you end up saving over $1000 by using a CCD instead of a DSLR.  Of course, the DSLR has the advantage of providing more pixels for the price, meaning larger printed pictures.  Plus it can be used for regular photography, making it dual-purpose.

For much more on CCD imaging accessories, visit the Equipment Basics section.

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