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Astromania 50mm Compact Deluxe Finder & Guidescope Kit with 1.25" Double Helical Focuser - Guiding with the Mini-Guide Scope: So astrophotography is easier and less equipment


This small guide scope takes does the job of a 'classic'
guide scope - but it is lighter and much easier to use! Previously, long and
unwieldy guide scopes were used to locate a guide star. But this is no longer
necessary! The sensitivity of modern astronomy cameras makes this possible.
You simply attach the mini guide scope onto your telescope like a finder. Or
you can use it as a convenient, large finder scope and spend less time
locating objects when visually observing. Focusing the 50mm Multi-Use Guide
Scope The 50mm Multi-Use Guide Scope features a precision helical focuser that
makes it easy to focus your guide stars quickly and precisely. The focuser,
made of machined, anodized aluminum, is the “non-rotating” variety, meaning
the guide camera does not rotate when focus is adjusted, but rather moves in
or out in fixed orientation, which is important for hassle-free focusing. You
don’t want stars rotating in the field of view when you’re trying to focus!
Drawtube travel of the helical focusing mechanism is 10mm and the motion is
extremely smooth and fine. The built-in extension tube can add up to 30mm of
additional length, to allow focus to be achieved with most autoguiders
available on the market as well as 1.25" eyepieces for use of the 50mm Multi-
Use Guide Scope as a visual finder scope. Just loosen the extension tube
locking thumbscrew, slide the extension tube out to the desired length, then
re-tighten the thumbscrew. When tightened down, you should not notice any
flexure in the extension tube; it is remarkably rigid. The top of the
extension tube features an engraved millimeter scale to aid in returning to
the exact extension tube length needed for critical focus, should you need to
switch between eyepieces and autoguider. Make sure your autoguider is powered
on and connected to your laptop computer, and that the software you will use
for autoguiding is up and running. Also, make sure the focus lock thumbscrew
is not tightened down. With the imaging software set to take continuous
exposures, rotate the knurled helical focus ring clockwise or counterclockwise
while you watch the star images themselves or the reference numbers from your
software on your laptop screen. If you can’t see any stars, you likely need to
move the extension tube in or out slowly until you see some, then continue
with the fine focusing using the helical focuser. When the stars become
reasonably sharp, or you’ve reached the lowest FWHM, you’re done! Once focus
is achieved, the focus lock thumbscrew can be lightly tightened to ensure the
drawtube remains set at that position,although this may not even be
necessary.There’s little need to tighten this thumbscrew firmly since most
guide cameras are relatively lightweight, and doing so could put sideways
pressure on the drawtube that might knock your carefully set focus off a bit.
For best results we recommend focusing the guide camera at the beginning of
your imaging session, following the focusing procedures in the imaging
software you use for astrophotography, such as MaxIm DL, PHD Guiding, or
Images Plus. Attaching the Guide Scope : The 50mm Multi-Use Guide Scope’s
mounting bracket has a Vixenstyle dovetail bar that can be mounted to your
telescope in different ways. First, it fits the standard dovetail finder scope
base included on many telescopes. Simply slide it into the dovetail base, then
tighten the thumbscrew on the base to secure the guide scope in place. The
bracket’s dovetail bar has one ¼"-20 (center) and two M8x1.25 threaded holes
for attachment to an optional universal dovetail plate. In the guidescope is
mounted on a telescope. Another method of attachment : Another method of
attachment is to bolt the guide scope bracket to an optional universal
dovetail plate, which you mount on top of your telescope. The mounting bar has
three threaded through-holes: the center hole has ¼"-20 threads and the two
larger holes on either side of center have M8 x 1.25 threads. To attach the
guide scope bracket to a universal dovetail plate, one way would be to insert
a ¼"-20 socket head capscrew of proper length up through the dovetail plate
and into the center hole of the bracket’s dovetail bar. Tighten the bolt
firmly with an Allen wrench. Then install the universal plate onto your
telescope’s tube rings or radius blocks. Alternatively you could attach the
bracket using two M8x1.25 screws in the same manner.   Aiming the 50mm Guide
Scope : The 50mm Multi-Use Guide Scope is mounted in a dual-ring aluminum
bracket that has six nylon-tipped thumbscrews to secure the guide scope in
place. Although you may never need to do it in order to find a guide star, you
can adjust the direction the guide scope is pointed within the bracket by
alternately loosening and tightening the three thumbscrews on the front or
back ring (usually you won’t need to make adjustments on both rings). Just
make sure that all six thumbscrews are tightened before you begin guiding. Do
not over-tighten them, however, or you could strip the screw threads! Read
more Using the 50mm Multi-Use Guide Scope as a Finder Scope ? The 50mm Multi-
Use Guide Scope conveniently doubles as a 50mm finder scope with the addition
of an optional 1.25"-barrel eyepiece inserted into the focuser collar. You may
need to slide the extension tube out nearly all the way to reach focus with
the eyepiece. You will need to align the finder scope with the main telescope
before starting your observing or imaging session. You do that by adjusting
the three thumbscrews on one or both of the bracket rings until a distant
object in the main telescope’s eyepiece is also centered in the finder scope’s
eyepiece. Use of an optional crosshair eyepiece is helpful in achieving exact
centering of an object. Read more Caring for the 50mm Multi-Use Guide Scope :
To keep dust from getting inside the guide scope and from accumulating on the
objective lens, keep the front and rear caps installed when the guide scope is
not in use. We recommend storing the guide scope in a padded accessory case.
Cleaning the Lens: Although it shouldn’t need cleaning very often, you can
clean the front lens of theguide scope with any quality optical lens cleaning
tissue and optical lens cleaning fluid designed for multi-coated optics. Never
use regular glass cleaner or cleaning fluid designed for eyeglasses. Before
cleaning with fluid and tissue, eject any loose particles from the lens with a
blower bulb, compressed air, or a soft brush such as a LensPen. Then apply
some cleaning fluid to a lens tissue, never directly on the optics. Wipe the
lens gently in a circular motion, then remove any excess fluid with a fresh
lens tissue. Oily fingerprints and smudges can be removed using this method.
Use caution, as rubbing too hard may scratch the lens. Never re-use the same
tissue. Read more


  • Mini-guide tube to quickly find objects and guiding stars, designed both for visual, as well as for photographic use.Take any 1.25 inch eyepieces in your collection, worm-focuser: fast focusing. Prevents rotation of the camera and eyepiece. Or use it as a comfortable, large viewfinder to waste less time finding objects in visual observation.
  • 190mm focal length. Compact mini guide scope designed for use with astrophotography telescopes up to 1500mm focal length with bright, wide-field optics puts numerous potential guide stars in view so you'll never have to search for one!
  • Adjustable-aim dovany weight to an astrophotography setup and can conveniently be stashed in an accessory case between uses. "Dovetail guide scope bracket installs on virtually any astrophotography telescope quickly and easily.
  • The sturdy metal housing made of black anodized aluminum. Looking out not only solid, but is also very robust. A milled and knurled ring allows easy and precise fine focus adjustments. It comes with matching pipe clamps and a Synta-style mounting plate to make assembly and installation as easy as possible.
  • Have a built-in worm-focuser with Brass Compression Ring and 2 thumbscrews,40mm focusing range (10mm focusing range with micro-focusing Helical focuser, the rest is by a fixable, scaled drawtube) is made possible by an extremely precise focus adjustment. The mechanism has a determined orientation: This is mounted cameras or eyepieces - and thus also the area with your guide stars - not rotate during focusing.

Product Details

  • Product Dimensions: 8.1 x 2.8 x 3.5 inches
  • Item Weight: 1.3 pounds
  • Shipping Weight: 1.3 pounds
  • Item model number: SKU_AM_GS50

Shipping & Handling

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Return Policy

All returns accepted within 14 days after receiving the item, refund given as money back (no exchanges permitted), return shipping to be paid by buyer. 15% restock fee will be charged for all returns. Buyer is responsible for return shipping on any item that is not damaged.

Filed under: Eyepieces & Accessories