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Altair Canon DSLR 0.8x Reducer Flattener Kit For Starwave 70ED

Altair Canon DSLR 0.8x Reducer Flattener Kit For Starwave 70ED
Price:  £119.00(Inc. 20% VAT)Earn 119 Loyalty Points

Model:  SW70ED-08XR-CDSLR
Brand:  Altair



Generally In Stock, Please Confirm Before Ordering

2 Year Warranty On All New Items

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:

Field flattener body with standard 2" push-fit barrel on the front, and M48x0.75 male rear thread.
M48x0.75 spacer to create the optimum spacing for Canon EOS DSLR cameras.
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.

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Some items that are showing as in stock are in stock at our holding warehouses, not at the shop. To double check the stock levels at the shop, please contact us on 01909774369 or

The delivery times for most items is 1 - 2 days but again, please double check stock levels on important orders before placing an order via the website.

The delivery costs for courier next day are for mainland UK only. If you live in the Scottish Highlands/Islands, Channel Islands or Northern Ireland, then a shipping surchage will apply. please contact us for prices. Smaller items can still go 1st class via Royal Mail.

Please note that if you are wanting to take advantage of our Saturday and Sunday timed services or next day pre 12 or pre 10:30 services, you MUST check that the stock is here at the shop before placing orders. Also, orders using the Saturday and Sunday services must be placed before 2pm the previous working day. Also, please remember to check that the stock is here at the shop before placing orders. If the stock is not at the shop, we won't be able to ship on any of the timed services. 

Please note International customers will need to contact us for a shipping price prior to ordering via the website. This all depends on the size and weight of the items. Please get in touch with us for any postage costs. Please note we do NOT ship telescopes or heavy items outside of the UK. This is due to massive postage costs and problems regarding returns.

If you have any questions regarding stock levels or delivery, please get in touch.

Rother Valley Optics now have a loyalty point scheme active on the website. As you can see from the products, every item has a point value. Each pound you spend with us, you will receive 1 loyalty point. 1 point is worth 1p. You can accumulate these points as you shop with us, then when you are over £5, you can spend them on the website! Easy as that.

Even if you collect most of your items from our shop, you can still order via the website and select the "shop collection" delivery option. Then you can come to our shop, collect your item and still get your points!

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So happy shopping and if you have any questions about the scheme or any other queries, please get in touch.

Rother Valley Optics


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Rother Valley Optics Ltd is registered in England and Wales 04762707. Registered Office: 21 Station Road, Kiveton Park, Rotherham, S26 6QP. Rother Valley Optics Ltd acts as a credit broker only. Rother Valley Optics Ltd are authorised and regulated by the Financial Conducts Authority. Credit provided subject to age and status..

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- - - Rother Valley Optics Ltd

01909 774 369

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