Calculator for DSLR Astrophotography
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I provided the DSLR calculator below to help you decide on a good match between various telescopes & digital SLR cameras. It should be a helpful tool for determining the area of sky that will be framed using particular DSLR/telescope combinations. Also, I added a magnification calculator. This will provide the approximate magnification of an object with your DSLR and telescope at prime focus. It is based on your sensor width and height as well as telecope focal length. For detailed instructions and concept, see article posted on AstroPhotography Tonight: DSLR Astrophotography Calculator. Please feel free to email me with any questions or comments. Thanks, Ray Shore | See My Digital SLR Astrophotography Tutorial!
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DSLR's |
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Compare the results above with the objects listed in the Messier table below to see how well the camera/telescope combination will sufficiently frame the object. |
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Angular Size (arc min) |
Messier Object |
Angular Size (arc min) |
Messier Object |
Angular Size (arc min) |
Messier Object |
Angular Size (arc min) |
Messier Object |
Angular Size (arc min) |
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1 |
6 x 4 |
23 |
27.0 |
45 |
110.0 |
67 |
30.0 |
89 |
4.0 |
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2 |
12.9 |
24 |
5.0 |
46 |
27.0 |
68 |
12.0 |
90 |
9.5 x 4.5 |
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3 |
16.2 |
25 |
40.0 |
47 |
30.0 |
69 |
7.1 |
91 |
5.4 x 4.4 |
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4 |
26.3 |
26 |
15.0 |
48 |
54.0 |
70 |
7.8 |
92 |
11.2 |
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5 |
17.4 |
27 |
8.0 x 5.7 |
49 |
9 x 7.5 |
71 |
7.2 |
93 |
22.0 |
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6 |
15.0 |
28 |
11.2 |
50 |
16.0 |
72 |
5.9 |
94 |
7 x 3 |
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7 |
80.0 |
29 |
7.0 |
51 |
11 x 7 |
73 |
2.8 |
95 |
4.4 x 3.3 |
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8 |
60 x 35 |
30 |
11.0 |
52 |
13.0 |
74 |
10.2 x 9.5 |
96 |
6 x 4 |
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9 |
9.3 |
31 |
178 |
53 |
12.6 |
75 |
6.0 |
97 |
3.4 x 3.3 |
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10 |
15.1 |
32 |
8 x 6 |
54 |
9.1 |
76 |
2.7 x 1.8 |
98 |
9.5 x 3.2 |
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11 |
14.0 |
33 |
73 x 45 |
55 |
19.0 |
77 |
7 x 6 |
99 |
5.4 x 4.8 |
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12 |
14.5 |
34 |
35.0 |
56 |
7.1 |
78 |
8 x 6 |
100 |
7 x 6 |
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13 |
16.6 |
35 |
28.0 |
57 |
1.4 x 1.0 |
79 |
8.7 |
101 |
22.0 |
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14 |
11.7 |
36 |
12.0 |
58 |
5.5 x 4.5 |
80 |
8.9 |
102 |
5.2 x 2.3 |
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15 |
12.3 |
37 |
24.0 |
59 |
5 x 3.5 |
81 |
21 x 10 |
103 |
6.0 |
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16 |
7.0 |
38 |
21.0 |
60 |
7 x 6 |
82 |
9 x 4 |
104 |
9 x 4 |
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17 |
11.0 |
39 |
32.0 |
61 |
6 x 5.5 |
83 |
11 x 10 |
105 |
2.0 |
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18 |
9.0 |
40 |
0.8 |
62 |
14.1 |
84 |
5.0 |
106 |
19 x 8 |
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19 |
13.5 |
41 |
38.0 |
63 |
10 x 6 |
85 |
7.1 x 5.2 |
107 |
10.0 |
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20 |
28.0 |
42 |
85 x 60 |
64 |
9.3 x 5.4 |
86 |
7.5 x 5.5 |
108 |
8 x 1 |
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21 |
13.0 |
43 |
20 x 15 |
65 |
8 x 1.5 |
87 |
7.0 |
109 |
7 x 4 |
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22 |
24.0 |
44 |
95.0 |
66 |
8 x 2.5 |
88 |
7 x 4 |
110 |
17 x 10 |
