The bino-viewer requires an additional optical path length of 11cm. This amount of travel must be available at the focuser. For SC/ACF/Edge HD instruments with main mirror focusing this is usually no problem. However, a glass path corrector is required with most other instruments.
It can be determined which glass path corrector is correct for your instrument:
1 Firstly, focus on a distant object.
2 Screw the focuser in as far as possible.
3 Screw it back out by 1cm.
4 Take the eyepiece to be used with the bino-viewer and hold it about 20cm from the focuser.
5 Look through the eyepiece and move it slowly towards the focuser until the image becomes sharp.
6 Using a ruler, measure the distance between the eyepiece stop and the focuser.
- If the distance is between 6.5 and 8cm, the required glass path corrector is 2 inches long. Product 10824
- If the distance is between 3.3 and 6.5cm, the required glass path corrector is 2.6 inches long. Product 8665
- If the distance is between 1.8 and 3.3cm, the required glass path corrector is 1.7 inches long. Product 8663
- If the distance is between 0 and 1.8cm, the required glass path corrector is 1.25 inches long. Product 8662