Nearly every visual observer needs a good medium-power eyepiece in their toolkit. Such an eyepiece, one with a focal length of 10mm to 15mm, is ideal for observing the moon and many star clusters, galaxies, and nebulae. If it has a large enough field of view, the eyepiece can also accommodate larger deep-sky objects or multiple objects at a sufficient magnification to show fine detail and structure.
GSO's Cassegrain Telescope can be regarded as somewhat of a specialist instrument. Its excellent overall optical quality, fine lunar and planetary performance, reasonable size and weight, and bargain price make it a fine choice where sterling deep-sky and rich-field capability are not a priority.
Figure 1 – The new ZWO ASI6200MC-Pro full-frame camera
ZWO has some exciting new cameras coming in the next few months!
The first two are the long-anticipated ZWO ASI6200 Pro full-frame cameras, available in color and monochrome . These high-end cooled 16-bit cameras feature the Sony IMX455 CMOS sensor with 61.2 megapixels (9600 x 6400), a QE of