The cookie settings on this website are adjusted to allow all cookies so that you have the very best experience. If you continue without changing your cookie settings, we'll assume that you are happy to receive all cookies on our website. However, if you would like to, you can change your settings at any time using the Change cookie settings link in the Special menu.        
Home > Field Flatteners & Reducers > Canon DSLR 0.8x Reducer Flattener kit for Starwave 70ED F6 refractor

Canon DSLR 0.8x Reducer Flattener kit for Starwave 70ED F6 refractor

Canon DSLR 0.8x Reducer Flattener kit for Starwave 70ED F6 refractor
Using the Altair Planostar Flattener with M48 DSLR Adapter
Price: £119.00
Incl. VAT 20% ( £19.83 )
Product code: SW70ED-08XR-CDSLR
Add to wish list

A high quality dual element 0.8x Field Flattener / Reducer for use with Starwave 70ED Refractor and Canon DSLR.

The field flattener improves the quality of star images toward the field edges and decreases the focal ratio from F6 to F4.8.

The focal length of the telescope decreases from 420mm to 336mm.

Everything you need to connect your Canon DSLR to your Starwave refractor is included in the kit.

Kit includes:

  1. Field flattener body with standard 2" push-fit barrel on the front, and M48x0.75 male rear thread.
  2. M48x0.75 spacer to create the optimum spacing for Canon EOS DSLR cameras.
  3. Canon EOS DSLR M48 adapter which screws into the M48 spacer, and fits to the camera body, just like any EOS camera lens.

All lenses are fully multicoated and are made from the finest optical glass, housed in a CNC machined, black anodised aluminium body.

A rubber cap is included to cover the 2" push-fit barrel, and a metal threaded M48 cap is included to cover the rear optical element.


The Canon EOS adapter has an inner ring with M48 thread. 3x small grub screws spaced 120 degrees apart are located around the edges, allowing the M48 thread to be removed from the EOS adapter. These grub screws may need to be tightened up on first use. You can check this by rotating the EOS bayonet adapter against the . Simply screw the EOS bayonet adapter onto the M48 spacer, which is already attached to the rear of the flattener. Note: A small silver indexing cross-head screw is located in the EOS bayonet adapter for use with older EOS lenses. If the EOS lens does not click into place first time, this screw can be removed and discarded for use with more modern lenses.

How does it work and why do I need it? All refractor lens systems exhibit some natural field curvature, which, while not relevant for visual observation, can be visible in photgraphic images. This field flattener/reducer has a 2" pushfit barrel which can be inserted directly into the rear focuser of your Starwave 70ED or refractor, converting it into a fast astrograph with a faster focal length and a flatter photographic field than the existing lens system alone. By reducing the focal length by a factor of 0.8x, you get a faster focal ratio, therefore exposure times are reduced by a ratio of 1:1.56 compared to the normal exposure time. In photographic terms this is expressed as a gain of +0.64EV.

Altair Astro Product Discussion ForumQuestions about Starwave products?
Where to buy Starwave products:

European orders:

European orders - order on this page or contact our European dealers:

‚ÄčNorth America & Canada orders: 

Products can be ordered online from Altair with tracked insured shipping to anywhere in the world. For large items shipping price may need to be re-quoted.

Availability: If product shows as out of stock, please click on the "Notify me when in stock" button to receive instant notification of availability. Altair Astro and iOptron reserve the right to change the product price and specification without notice. 

Related products

Customer feedback

Customer Reviews

There have been no reviews for this product.

Send to friend

: *
: *
: *
Type the characters you see in the picture:

Gift certificates