Sunday, April 6, 2014

Double Star Iota Cancri with 300mm DSLR Lens

You don't always need a telescope to split double stars. Zooming in with a 300mm telephoto lens is enough for me to resolve separations of about 28" (arcseconds), so with a separation of about 30" Iota Cancri was within range.

The double star is in the upper left arm of Cancer, and although Cancer is itself a fairly dim constellation, this makes it an easy target to spot. The two stars are supposed to appear yellow and blue/white in a scope, but in my camera they came out more red and blue.

iota cancri double star with 300mm lens
Composite image: Background stack of 29 subs, 85 dark, 78 bias at ISO 3200, 300mm, 1.3 sec, f/5.6
Insert single frame at ISO 3200, 300mm, 1.3 sec, f/5.6

I used the same stacked-background single frame insert technique that I used on 8 Lacertae and I'm pleased with the results again!

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