Sky-Watcher 9x50 Right-Angle Finder Scope with Mirror Diagonal

Sky-Watcher 9x50 Right-Angle Finder Scope with Mirror Diagonal

A large Dobsonian or a powerful reflector offers breathtaking views of the deep sky - but without a quality finder scope, locating objects in the first place can be unnecessarily slow and frustrating. The Sky-Watcher 9x50 finder scope with a 90° viewing angle is designed precisely for these situations. The built-in mirror diagonal provides a comfortable right-angle viewing position, so you no longer need to contort yourself into awkward postures or lie on the ground to look through the finder. The 9x magnification and 50 mm objective aperture ensure that you can see significantly more through the finder than with the naked eye, making it much easier to locate even fainter deep-sky objects.

Why a Right-Angle Finder Is a Genuine Advantage

Anyone who has used a large Dobsonian, a Newtonian reflector, or any telescope on an alt-azimuth mount will be familiar with the problem: when the telescope is pointed high toward the zenith, looking through a straight-through finder requires uncomfortable kneeling, lying on the ground, or bending into positions that quickly become tiring. A right-angle finder with a mirror diagonal eliminates this problem entirely - the 90° viewing angle allows you to look comfortably into the finder regardless of where the telescope is pointing. This makes extended observing sessions noticeably more relaxed and less physically demanding.

The right-angle design is equally useful in confined spaces - on a balcony, in a garden shelter, or when observing from a vehicle - where there is limited room to move freely around the telescope.

Optical Performance - 9x Magnification and 50 mm Aperture

The combination of 9x magnification and a 50 mm objective lens places this finder in the category of genuinely capable search instruments. Compared to the standard 6x30 finders that come with most telescopes, this unit offers substantially more in every respect:

• The 50 mm objective collects approximately three times more light than a 30 mm lens - faint stars and objects that would be invisible in a smaller finder are clearly visible here
• The 9x magnification allows reliable identification of star fields even in the dense regions of the Milky Way and enables more precise centering of the telescope on the target object
• The wider absolute field of view makes it faster to orient yourself when transferring from a star chart to the sky

These characteristics make the 9x50 format the standard choice for owners of larger telescopes - particularly Dobsonians from 8″ aperture upward, where the observer typically demands greater pointing accuracy and needs to see enough reference stars in the finder for reliable star hopping.

Crosshair Reticle and Image Orientation

The finder is fitted with a simple non-illuminated crosshair reticle. For most visual observers this is entirely sufficient - the natural darkening toward the edge of the finder's field of view helps the eye instinctively center on the crosshair. If you regularly work at very dark sites or prefer the precision of an illuminated reticle, it is worth considering a model with a red-illuminated crosshair instead.

The image in the finder is upright but mirror-reversed - a natural consequence of using a mirror diagonal. When working with a star atlas or chart, this reversal needs to be kept in mind: the left side of the finder image corresponds to the right side of the map and vice versa. After a short period of adjustment, most experienced observers find this type of image easy to work with and navigate by.

Bracket and Mounting System

The finder scope is supplied with a well-engineered bracket that holds it firmly to the telescope body while protecting the surface of the finder tube from damage. The mounting system combines a front rubber ring with three rear adjustment points:

• The front rubber ring wraps around the finder tube and cushions it securely in the front collar without any risk of denting or scratching the surface
• Two rear nylon-tipped thumbscrews allow fine adjustment of the finder axis in two directions - vertically and horizontally
• The third point is a spring-loaded pin that keeps the finder tube gently but constantly pressed against the two thumbscrews, ensuring that the alignment remains stable and does not shift during telescope slewing or transport

Aligning the Finder Scope

Correct alignment of the finder is the foundation for efficient telescope use. The process is straightforward: point the telescope at an easily identifiable object - a bright star at night, or a distant fixed point in the landscape during daytime alignment - and then use the two thumbscrews to adjust the finder until that same object sits precisely on the crosshair. Tighten the screws afterward and the spring-loaded pin will ensure the alignment holds steady throughout the entire observing session.

Who Is This Finder Scope For

The Sky-Watcher 9x50 right-angle finder is the ideal choice for owners of Dobsonian telescopes from 6″ aperture upward, where straight-through finders without an angled viewing position create ergonomic difficulties. It is equally well suited to large Newtonians on equatorial mounts and powerful refractors, where the observer needs a capable finder for navigating to fainter deep-sky objects. For astronomers who practice star hopping - navigating across the sky from a bright reference star to a fainter target through a series of intermediate star fields - the 9x50 format is practically indispensable.

Technical Specifications