Below is only a small part of the complete article found in the Files Section of the BinocularAstronomy Yahoo Group on potential star counts with binoculars based on field size and magnitude reach. Check out BinocularAstronomy for the full article.
(My apologies if the chart does not format correctly upon posting.)
Star Counts for Binoculars and Rich Field Telescopes
BINO MAG LMT STAR LMT(Total Sky) FIELD SQ.DEG/SKY(Averaged) STARS/FIELD
7X35 10.4 450,000 9.3 deg 68 742
8x42 10.8 600,000 8.2 deg 53 771
10x50 11.2 7 50,000 6.5 deg 33 600
10x50 11.2 750,000 5.0 deg 20 364
12x60 11.6 1,000,000 5.7 deg 25.5 618
16x60 11.6 1,000,000 2.8 deg 6.2 149
15x70 11.9 1,600,000 4.5 deg 15.9 616
16x70 11.9 1,600,000 4.0 deg 12.5 485
20x80 12.2 2,000,000 3.5 deg 9.6 465
20x100 12.7 3,000,000 3.0 deg 7.0 509
25x125 13.2 4,000,000 2.5 deg 4.9 475
30x150 13.6 6,000,000 2.2 deg 3.8 553
(It is interesting to note that star counts stay within a relatively narrow range with binoculars with maximum fields, typically between about 450 and 750 stars per field. As magnitude reach improves, field size decreases keeping the star counts close in spite of increasing aperture. The peak count was seen with a pair of wide angle 8x42 pair of binoculars; so I guess you could say it qualifies as the top "Rich Field" Binocular. Standard angle binoculars really suffer when it comes to star counts because of their dramatically small total field size area)
Some telescopes added to the mix -
SCOPE MAG LMT STARS Poss. FIELD Sq Degrees STAR CT
80mm f/6.25 12.2 2,000,000 4.8 deg 18.1 878
(35mm eyepiece and 14.3x mag)
152mm f/5 13.6 6,000,000 3.1 deg 7.6 1105
(35mm eyepiece and 21.7x mag)
(more than double the star count as compared to equivalent power binoculars)
Barry Simon
(My apologies if the chart does not format correctly upon posting.)
Star Counts for Binoculars and Rich Field Telescopes
BINO MAG LMT STAR LMT(Total Sky) FIELD SQ.DEG/SKY(Averaged) STARS/FIELD
7X35 10.4 450,000 9.3 deg 68 742
8x42 10.8 600,000 8.2 deg 53 771
10x50 11.2 7 50,000 6.5 deg 33 600
10x50 11.2 750,000 5.0 deg 20 364
12x60 11.6 1,000,000 5.7 deg 25.5 618
16x60 11.6 1,000,000 2.8 deg 6.2 149
15x70 11.9 1,600,000 4.5 deg 15.9 616
16x70 11.9 1,600,000 4.0 deg 12.5 485
20x80 12.2 2,000,000 3.5 deg 9.6 465
20x100 12.7 3,000,000 3.0 deg 7.0 509
25x125 13.2 4,000,000 2.5 deg 4.9 475
30x150 13.6 6,000,000 2.2 deg 3.8 553
(It is interesting to note that star counts stay within a relatively narrow range with binoculars with maximum fields, typically between about 450 and 750 stars per field. As magnitude reach improves, field size decreases keeping the star counts close in spite of increasing aperture. The peak count was seen with a pair of wide angle 8x42 pair of binoculars; so I guess you could say it qualifies as the top "Rich Field" Binocular. Standard angle binoculars really suffer when it comes to star counts because of their dramatically small total field size area)
Some telescopes added to the mix -
SCOPE MAG LMT STARS Poss. FIELD Sq Degrees STAR CT
80mm f/6.25 12.2 2,000,000 4.8 deg 18.1 878
(35mm eyepiece and 14.3x mag)
152mm f/5 13.6 6,000,000 3.1 deg 7.6 1105
(35mm eyepiece and 21.7x mag)
(more than double the star count as compared to equivalent power binoculars)
Barry Simon