Starfield 140mm Focus Mask (FM-140)

Starfield 140mm Focus Mask (FM-140)The Bahtinov mask is used focus small telescopes accurately. Although masks have long been used as focusing aids, the distinctive pattern was invented by Russian amateur astrophotographer Pavel Bahtinov. Simply place the mask in front of the main optic of your telescope and take a picture. Look at the diffraction spike pattern and continue until the spikes are even. Using a Bahtinov mask is the easiest way to get into focus. This 140mm mask is great

75 Dimensions 62 mm Diameter by 36 mm Weight 120g (4

For 2x and 4x 2" Powermates

durable frame for the filter glass

Always use a contrasting colour to what you are observing

1920×1200 28fps

two 2" eyepieces

On camera storage Build-in total 192K byte user-accessible space

3e QE peak TBD Full well 46ke ADC 14bit DDRIII Buffer 256MB Non-volatile memory/On camera storage Build-in total 192K byte user-accessible space(image size up to 480X320) Interface USB3

Ideal "soul-mate" to Bino Vue

NexStar Evolution is equipped with 4 auxiliary ports--2 on top of the fork and 2 on the bottom

specifically those produced by artificial light including mercury vapor

Better color separation