William Optics Diffraction Spikes Bahtinov Focusing Mask - Dew Shield 243 mm to 308 mm - BM-DS-GR150 Free Shipping 16") Back focus from top

16") Back focus from top of threaded collar 77

up-close views of small subjects when needed

875" OTA Weight (with accessories) 72 pounds Dob Base Weight 105 lb Dob Base Measurements 36"x34" Zenith Eyepiece Height 74" Included Finder 9x50 Finder scope Included Diagonal No Included Eyepieces 25 mm/10 mm Plossl type Magnification w/ Included Eyepieces 72x/180x Included Case No Corrector No

15° Useable field 32 mm (1

William Optics Diffraction Spikes Bahtinov Focusing Mask - Dew Shield 243 mm to 308 mm - BM-DS-GR150 Free Shipping 16") Back focus from topWilliam Optics Diffraction Spikes Bahtinov Focusing Mask For Dew Shield 243 mm to 308 mm William Optics Diffraction Spikes Bahtinov Focusing Mask Fits dew shields with diameters of 243 mm to 308 mm Clear Acrylic Sheet design provides 92% light transmission Gives the Brightest diffraction spikes for focusing This is a William Optics Diffraction Spikes Bahtinov Focusing Mask made from Acrylic material, which is high in light transmission. This design