12
OPTICAL FINDERSCOPES (Continued)
FINDER MOUNTING RINGS
Your finderscope will need adjustable mounting rings that fit your model of telescope. Our 50 mm and 60 mm
finders use the R50 DA rings. Our 80 mm finder will require the R80DA rings.
The specific model number of rings that fit the shoe on your telescope is the R50DA (shown to
the left) or R80DA depending on the size of finder you order.
To install the finderscope into the rings, you must first remove
the entire back end assembly including the finderscope’s fo-
cuser, prism and rotator. Never remove the dewshield on the
finder as this will cause the lens to fall out of the tube.
Loosen the thumb screws on the finder rings enough to slide the finderscope
into the rings then tighten the screws until they contact the finderscope. Thread the rear assembly back on the
finderscope. Slide the finderscope with rings into the mounting shoe on the telescope focuser. Secure the
mounting shoe thumbscrews tightly so the finderscope and rings do not slip out of the shoe.
For more information on our finder scopes and rings visit http://www.stellarvue.com/finder.
Still not sure? call us at (530) 823-7796 or Email us at mail@stellarvue.com.
50 mm finderscope mounted in rings
finderscope mounting shoe
Mounting finderscope and rings
2. Tighten
mounting shoe
Thumbscrews
1. Slide into shoe
There are six thumb screws that hold the finderscope. These thumb screws allow the user to adjust
the finderscope up/down, left/right so it is pointed directly at the same spot in the sky as the main
telescope. To make the adjustment loosen one thumb screw and tighten the other two on the same
ring which will shift the finderscope’s position. It makes sense to adjust the finderscope during the
day so it is ready and accurately aligned to the telescope before nightfall. Follow this procedure to
adjust the finderscope:
Place your lowest power eyepiece in your telescope. Point it at a distant object
like the top of a power pole. In this example shown to the right, we are placing the
left top electric insulator in the center of the eyepiece. You can use any distant
object like the top of a flagpole or a building on the top of a hill.
With the object placed in the center of the telescope eyepiece look through the
finderscope eyepiece and adjust the thumb screws on the finderscope mounting
ring until this distant object is positioned where the two crosshairs in the reticle
intersect. Make sure all six thumbscrews are tight when you finish aligning it. You
are now ready to observe at night using the finderscope. When objects are placed
behind the cross hairs in the finderscope they should be centered in the telescope
using your lowest power eyepiece.
Telescope View
Finderscope View
