GSO




Manufacturer Product Image Item Name Price+
GSO Yellow-Green Filter #11

Yellow-Green Filter #11

Eyepiece filters are an invaluable aid in lunar and planetary observing. They reduce glare and light scattering, increase contrast through selective...
R212

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GSO IR Blocking Filter 1.25"

IR Blocking Filter 1.25"

This filter has an extremely sharp cutoff at 690nm yet leaves all the visible red, including the important 656nm H-alpha emission line, preventing IR...
R222

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GSO 1.25" to 2" Focus adapter

1.25" to 2" Focus adapter

Fits into any 2" focuser to reduce the size to 1.25" with a compression ring to clamp better and not to damage your eyepiece.
R252

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GSO Dovetail bracket

Dovetail bracket

For mounting a finder scope or laser holder to your telescope.
R252

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GSO UHC Filter

UHC Filter

The original Ultra-High-Contrast narrow bandpass filter (24nm) isolates just the two doubly-ionized oxygen lines (496 and 501nm lines) and H-beta...
R261

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GSO UV-IR Cut Filter

UV-IR Cut Filter

The special B+W filter blocks undesirable ultraviolet and infrared rays that may interfere with the image. The filter can therefore be used for video...
R261

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GSO 1.25" 0.5x Focal Reducer GSO

1.25" 0.5x Focal Reducer GSO

GSO new 0.5x focal reducer could screws on to any 1.25” eyepieces barrel and provides a nominal reduction of 0.5X.   The actual...
R282

... more info
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GSO 1.25" to 2" plus T thread adapter

1.25" to 2" plus T thread adapter

This versatile 1.25" to 2" adapter includes t-threads. It is machined of anodized aluminum with dual thumbscrews for extra security. A...
R353

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GSO 2" Extension Tube (35mm) with Brass Compression Ring

2" Extension Tube (35mm) with Brass Compression Ring

This high-quality GSO extension tube can be inserted into any 2" telescope focuser to gain an additional 35mm (1.38") of back-focus travel....
R424

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GSO 2" Extension Tube (50mm) with Brass Compression Ring

2" Extension Tube (50mm) with Brass Compression Ring

This high-quality GSO extension tube can be inserted into any 2" telescope focuser to gain an additional 50mm (1.97") of back-focus travel....
R424

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Monthly Specials For July

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