Varrow Forge 203 Schmidt-Cassegrain, tube with equatorial mount

Specifications

Description

The Forge 203 Schmidt-Cassegrain is an 8 in catadioptric telescope with a 203 mm corrector plate and primary mirror. Light enters through a thin corrector plate, reflects from a spherical primary mirror, and returns through a central hole to a secondary mirror mounted on the plate. This folded light path gives a focal length of 2030 mm in a tube roughly half a meter long, which is how the telescope reaches f/10 in a compact body.

At f/10 the Forge 203 suits lunar, planetary, and double-star work. With a 10 mm eyepiece it reaches about 203 times magnification, and with a 25 mm eyepiece about 81 times. Its theoretical resolution is about 0.6 arcseconds, so on nights with steady air you can see fine detail in the Cassini Division of Saturn's rings and along the crater walls near the lunar terminator. The sealed tube and central obstruction also reduce the contrast of faint extended objects compared with a refractor of the same aperture, so you should expect galaxies and nebulae to look smaller and dimmer than they do in long-exposure photographs.

The tube weighs 9.8 kg, so you need a mount rated for at least 12 kg of payload, such as a sturdy equatorial head or a heavy alt-az mount. The corrector plate and mirror take 45 to 60 minutes to reach outdoor temperature, so carry the tube out well before the session starts. A dew heater for the corrector plate is not included, and dew can form on the plate on humid nights. The 2 in dual-speed focuser carries a star diagonal and a heavy eyepiece, and the 8x50 finder helps you locate targets at low power before you switch to the main eyepiece.

About this configuration

Every configuration of the Varrow Forge 203 Schmidt-Cassegrain shares the same optics; the choices below change how the telescope is mounted, finished, and equipped. With the equatorial mount, slow-motion controls let you keep a planet centered at high magnification with one hand. Balancing the tube and the counterweight before each session helps the equatorial mount move smoothly in both axes. The matte black finish hides scuffs and keeps reflections from porch lights and streetlights to a minimum.

The astrophotography kit adds a T-ring adapter for a camera body and a Bahtinov mask for precise focusing on a star. The 2023 edition uses the same optical design as later years, with small differences in fittings and labels. The optical figures in the specifications table apply to this configuration and to every other version of the Varrow Forge 203 Schmidt-Cassegrain.

What's in the box

• Optical tube with corrector plate and dust cap
• Dovetail bar for mounts
• 2 in dual-speed focuser with 1.25 in adapter
• 8x50 finder scope with bracket
• 1.25 in star diagonal
• Equatorial mount with steel tripod
• Counterweight and counterweight shaft
• T-ring and T-adapter
• Bahtinov focusing mask

Compatibility notes

• Accepts 2 in eyepieces through the focuser and 1.25 in eyepieces through the supplied adapter.
• The dovetail bar fits standard dovetail saddles on equatorial and alt-az mounts.
• The tube weight requires a mount with a payload capacity of at least 12 kg.