Bang on Eric , I used bout of these to collimate the beautiful 25x100 Zhumell Tachyon bino's I got off Georgio
here in the clasifieds , it cost me $12 for a set of jewlers screw drivers at Bunnings and no more than 30 seconds to get a perfect image , that was 2 months ago and they have not moved since then .
I have since then collimated my 8x56 binos , and they too, were the left side screws moved the image in towards the centre or out and the right screws moved the image up and down . Easy as .
Dont be afraid , David as its easy if you follow the instructions .
Brian.
Quote:
Originally Posted by erick
Here you go:-
http://www.oberwerk.com/support/collimate.htm
http://www.cloudynights.com/item.php?item_id=416
Before you go adjusting anything, do look at the exit pupil and see if it is nice and round or "cat's eyes"? See the Cloudy Nights article.
Woops, I also made a mistake re the adjustment screws. Two are at the eye lens end of the prism, two (at 90 deg to the first) are at the objective lens end of the prism. See the Cloudy Nights photos. Usually, you only ever have to worry about a small tweak of one of the screws near the eye lens end. Your miscollimation sounds more gross.
You can check collimation in daylight, usually on a tripod or resting on a fence/rail/cushion. Find a distant straight left/right line (a gutter is usually a good choice). Set yourself up at 90 deg to it so it goes cleaning left to right across the view. You need to practice holding your head back until you see two separate images, them bring your head forward until they touch each other - do the straight lines in each come together, or is one above the other? You can attempt to adjust any up/down misalignment of the images using one screw (closest to eye lens). If you reach the end of travel (prism stops moving so image stops moving), you'll need to move to the same screw on the other prism. You can even do this is the dark on a bright star/planet. Practice pulling head back until two separate images, then move head forward allowing the images to come together and you'll see if the two images of the star are correct in the up/down direction. Remember, some left/right difference in images is not a problem - your eyes will adjust to that. |