$NOVAStar 0.8x Reducer & Field Flattener for Doublet ED Refractor Telescopes (T-Thread)$

$NOVAStar 0.8x Reducer & Field Flattener for Doublet ED Refractor Telescopes (T-Thread)$ $NOVAStar 0.8x Reducer & Field Flattener for Doublet ED Refractor Telescopes (T-Thread)$ $NOVAStar 0.8x Reducer & Field Flattener for Doublet ED Refractor Telescopes (T-Thread)$ $NOVAStar 0.8x Reducer & Field Flattener for Doublet ED Refractor Telescopes (T-Thread)$ $NOVAStar 0.8x Reducer & Field Flattener for Doublet ED Refractor Telescopes (T-Thread)$ $NOVAStar 0.8x Reducer & Field Flattener for Doublet ED Refractor Telescopes (T-Thread)$ $NOVAStar 0.8x Reducer & Field Flattener for Doublet ED Refractor Telescopes (T-Thread)$

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NOVAStar 0.8x Reducer & Field Flattener for Doublet ED Refractor Telescopes (T-Thread)

Your Price:

£89.00

The NOVAStar 0.8x Reducer/Flattener is designed for ED doublet APO telescopes, including the NOVAStar Emerald ED80D and NOVAStar Emperor ED110D, while remaining compatible with a wide range of doublet ED APO refractors. It corrects field curvature to eliminate elongated stars at the edges of the field and reduces the telescope’s effective focal length, increasing both the field of view and imaging speed.

For those new to astrophotography, the “speed” of a telescope refers to its focal ratio. A smaller number indicates a faster system. For example, an f/4 system gathers light faster than an f/8 system, allowing shorter exposure times to achieve the same image brightness.

Using this reducer/flattener with your telescope:

NOVAStar Emerald ED80D (f/6.25) → becomes approximately f/5
NOVAStar Emperor ED110D (f/6) → becomes approximately f/4.8

With the same eyepiece or imaging sensor, the reducer increases your field of view, decreases magnification, and allows shorter exposure times.

Ideal for DSLR, CCD, and CMOS astrophotography cameras, it provides pinpoint stars across sensors up to APS-C size. Correct field correction requires a 55mm back focus from the base of the T-thread (M42×0.75).

It features a 2" nosepiece, compatible with 2" (50.8mm) focusers, diagonals, and prisms. The nosepiece also includes a female M48 thread for 2" filters, such as light pollution or dual-band filters.

Use with DSLR cameras

A camera-specific T-ring is required. For example, a Canon EOS M42 T-ring (11mm thickness) plus the Canon 44mm flange distance achieves the required 55mm back focus.

Use with CMOS cameras

Many ZWO CMOS cameras have a back focal distance of 17.5mm. Additional adapters are often included with cooled ZWO cameras, or can be purchased separately for non-cooled models.

Specifications

Telescope connection: 2" barrel
Camera connection: M42×0.75 (T-thread)
Required back focus: 55mm from base of M42 thread
Filter compatibility: Female M48 thread for 2" filters
Weight: approx. 180g

Note: Product images may show similar items for demonstration purposes.