Skip to content

Astrophotography Deal - Celestron 11" RASA - $1000 Off - Now Only $2595 - Limited Quantity On Hand

Focus Aids

20 Items

William Optics Bahtinov Mask Cover for WO Z61 Telescopes - Gold - CPBM-61GD

SKU: WYO-CPBM-61-GD
  • Focus Masks & Caps Known to Fit: William Optics Z61 Telescopes
$78.00

William Optics Bahtinov Mask Cover for WO Z61 Telescopes - Red - CPBM-61RD

SKU: WYO-CPBM-61-RD
  • Focus Masks & Caps Known to Fit: William Optics Z61 Telescopes
$78.00

William Optics Bahtinov Mask Cover for WO GT71/Z73/Star71II Telescopes - Blue - CPBM-71BU

SKU: WYO-CPBM-71-BU
  • Focus Masks & Caps Known to Fit: William Optics GT71/Z73/Star71II Telescopes
$88.00

William Optics Bahtinov Mask Cover for WO GT71/Z73/Star71II Telescopes - Red - CPBM-71RD

SKU: WYO-CPBM-71-RD
  • Focus Masks & Caps Known to Fit: William Optics GT71/Z73/Star71II Telescopes
$88.00

William Optics Bahtinov Mask Cover for WO GT71/Z73/Star71II Telescopes - Gold - CPBM-71GD

SKU: WYO-CPBM-71-GD
  • Focus Masks & Caps Known to Fit: William Optics GT71/Z73/Star71II Telescopes
$88.00

William Optics Bahtinov Mask Cover for WO GT81 Telescopes - Blue - CPBM-81BU

SKU: WYO-CPBM-81-BU
  • Focus Masks & Caps Known to Fit: William Optics GT81 Telescopes
$98.00

William Optics Bahtinov Mask Cover for WO GT81 Telescopes - Red - CPBM-81RD

SKU: WYO-CPBM-81-RD
  • Focus Masks & Caps Known to Fit: William Optics GT81 Telescopes
$98.00

William Optics Bahtinov Mask Cover for WO GT81 Telescopes - Gold - CPBM-81GD

SKU: WYO-CPBM-81-GD
  • Focus Masks & Caps Known to Fit: William Optics GT81 Telescopes
$98.00

William Optics Bahtinov Mask Cover for WO 102 & 103 Series Telescopes - Blue - CPBM-102BU

SKU: WYO-CPBM-102-BU
  • Focus Masks & Caps Known to Fit: William Optics 102 & 103 Series Telescopes
$118.00

William Optics Bahtinov Mask Cover for WO 102 & 103 Series Telescopes - Red - CPBM-102RD

SKU: WYO-CPBM-102-RD
  • Focus Masks & Caps Known to Fit: William Optics 102 & 103 Series Telescopes
$118.00

William Optics Bahtinov Mask Cover for WO 102 & 103 Series Telescopes - Gold - CPBM-102GD

SKU: WYO-CPBM-102-GD
  • Focus Masks & Caps Known to Fit: William Optics 102 & 103 Series Telescopes
$118.00

William Optics Bahtinov Mask Cover for WO FLT132 Telescopes - Blue - CPBM-132BU

SKU: WYO-CPBM-132-BU
  • Focus Masks & Caps Known to Fit: William Optics FLT132 Telescopes
$178.00

William Optics Bahtinov Mask Cover for WO FLT132 Telescopes - Red - CPBM-132RD

SKU: WYO-CPBM-132-RD
  • Focus Masks & Caps Known to Fit: William Optics FLT132 Telescopes
$178.00

William Optics Bahtinov Mask Cover for WO FLT132 Telescopes - Gold - CPBM-132GD

SKU: WYO-CPBM-132-GD
  • Focus Masks & Caps Known to Fit: William Optics FLT132 Telescopes
$178.00
William Optics Diffraction Spikes Bahtinov Mask with Box

William Optics Diffraction Spikes Bahtinov Mask for 105mm-148mm Dew Shields - BM-DS-GR55

SKU: WYO-BM-DS-GR55
  • Focus Masks & Caps Known to Fit: 105 mm to 148 mm (4.13" to 5.82") Dew Shields
$48.00
William Optics Diffraction Spikes Bahtinov Mask

William Optics Diffraction Spikes Bahtinov Mask for 75mm-110mm Dew Shields - BM-DS-GR45

SKU: WYO-BM-DS-GR45
  • Focus Masks & Caps Known to Fit: 75 mm to 110 mm (2.95" to 4.33") Dew Shields
$43.00
William Optics Diffraction Spikes Bahtinov Mask

William Optics Diffraction Spikes Bahtinov Mask for 172mm-235mm Dew Shields - BM-DS-GR90

SKU: WYO-BM-DS-GR90
  • Focus Masks & Caps Known to Fit: 172 mm to 235 mm (6.77" to 9.25") Dew Shields
$68.00

William Optics Bahtinov Mask Cover for WO Z61 Telescopes - Blue - CPBM-61BU

SKU: WYO-CPBM-61-BU
  • Focus Masks & Caps Known to Fit: William Optics Z61 Telescopes
$78.00

William Optics Bahtinov Mask w/ Diffraction Spikes for 243mm-308mm Telescopes - BM-DS-GR150

SKU: WYO-BM-DS-GR150
  • Focus Masks & Caps Known to Fit: Telescopes w/ Diameter Between 243 mm & 308 mm (9.56" & 12.12")
$78.00

William Optics FSQ106 Bahtinov Mask Cap - CPBM-TH106

SKU: WYO-CPBM-TH106
  • Focus Masks & Caps Known to Fit: William Optics Telescopes
$168.00

There is no question how important it is to focus your astronomy system properly. Not only will precise focusing reveal optimal views, but it will ensure the highest image quality possible. Many focusing aids are adapters to connect a focuser to your optical tube assembly. This is particularly helpful if you plan on upgrading your focuser. Focuser adapters maintain your focuser’s stability and reduce strain on your optical tube assembly.


A Bahtinov mask is a must-have for every astrophotographer. This mask attaches to the front of the scope’s objective lens to show the astronomer how to precisely focus their telescope. The Batinov mask consists of three separate grids that produce three angled diffraction spikes when the telescope is pointed at a bright star. As the focus changes, the spikes appear to move so the observer can determine they must increase or decrease focus.


Another interesting focusing tool to consider is a micron indicator kit. These kits give you a readout of your exact focus settings. This great if you’re working with CCD photography, which often requires indexing the exact focus position of your imaging system. A micron indicator kit will often connect to a computer so you can easily use the kit on your computer.

High Point Scientific is rated 4.9/5 based on 1347 reviews