Brand
Accessories cut to the standard fittings
Astromania products are described by what they screw into or clamp onto. The dual finder bracket names its base pattern; the filter wheel gives its thread on each side and its build height; the reducer publishes its own focal length and clear aperture.
On this shelf a build height is not a detail — it is the whole specification, because a filter wheel that does not leave enough focus travel cannot be used at all. Astromania listings generally give it, and the pages here quote it as published.
The 0.5x reducer prints its filter thread as 28.5 × 0.75 mm where the convention on this site’s shelves is M28.5 × 0.6. The page for it reports both and flags the gap rather than assuming which is right.
Compare the thread and the length before the price. Parts that look identical on a shelf differ by the millimetre of optical path they add.
9x magnification · 50 mm objective · 90° viewing angle
A 9x50 angled finder with achromatic multi-coated optics, a 90-degree viewing angle and two-screw-and-spring alignment.
Best for: A telescope that regularly points high, where a straight finder is painful to use
≈ $69 / £72 / €95
70 mm aperture · 400 mm focal length · 90 mm focus range
A 70/400 guide scope with a helical focuser offering 90 mm of range including 10 mm of micro-focus, supplied with tube rings, a Synta plate and an adjustable counterweight.
Best for: Guiding a longer main telescope, where a short guide scope would not resolve the correction
≈ $156 / £164 / €189
8 mm focal length · apparent field stated two ways · four elements
A four-element fully multi-coated Plössl of 8 mm focal length in a metal 1.25 in barrel, with a fold-down rubber eyecup and a filter thread.
Best for: A step up from a supplied short eyepiece, on a case-based collection
≈ $17
A cemented two-element focal reducer of 85 mm focal length giving about 0.5x depending on spacing, with filter threads on both faces.
Best for: A long-focal-ratio telescope with a small sensor or a narrow-field eyepiece
A manual filter wheel holding five 2 in filters in an aluminium body, with a 2 in adapter on the telescope side and T-2 and M48 threads on the camera side.
Best for: A Newtonian or Dobsonian imaging train where back focus is short and filters change often
A full-aperture solar filter with a Baader AstroSolar film in an anodised aluminium cell, clamped to the front of the tube by three padded screws.
Best for: Fitting the front of a telescope whose tube outside diameter has been measured first
A bracket with two Vixen/Synta-pattern finder bases, letting two aiming devices be carried on one telescope without drilling the tube.
Best for: Running a red dot finder and an optical finder together on one telescope
A flexible black ABS dew shield with a velvet lining and a foam contact strip, for tube outside diameters of 148 to 167 mm.
Best for: A 150 mm reflector or a Schmidt-Cassegrain whose front diameter has been measured
A metal-bodied laser collimator with seven brightness steps, a published wavelength band and output figure, and three sealed adjustment ports for trueing the tool itself.
Best for: A Newtonian owner who wants a laser they can check and correct themselves
Any figure written into the body of this page was true on the day it was written. The amount shown next to each instrument is requested from the retailer as the page loads, and it is that amount, not the text, that stands.
