Starfield 140mm Focus Mask (FM-140) Power Adapter Before StarSense

Before StarSense

Additional Aux accessory ports and autoguider port on the Dec axis for better cable management

Using a Bahtinov mask is the easiest way to get into focus

while the brush retracts safely inside the LensPen

Starfield 140mm Focus Mask (FM-140) Power Adapter Before StarSenseThe 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