elpajare
Member
Posts: 438
home town/country: Girona-Spain
time zone gmt +/-: 1
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Post by elpajare on Feb 11, 2019 9:42:08 GMT
When we have already photographed all the galaxies, globular clusters and planetary nebulae, we have open clusters and bright nebulae of magnitude = <12 to see and photograph.
Of the 1450 visible objects in the northern hemisphere with amateur media and from the backyard there are:
Open clusters = 26% Bright nebulae = 7%IMO, the simplest and cheapest system is a combination between a 74 mm apochromatic refractor with a very sensitive medium size chip like that of IMX294This combination has a FOV in which all these objects fit:
TSOPtics 3" f6 + IMX294 FOV= 2,54ºx1,73º
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