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William Optics RedCat 51 APO 250mm f/4.9 - L-RC51Ix

In Stock - Ships Today if Ordered by 2pm! (Tues - Fri)

We will price-match Canadian astronomy dealer pricing

Green Right Arrow Click here to simulate views with this scope and various eyepieces

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Note: For DSLRs, it's highly recommended to use a William Optics T mount adapter in order to achieve proper focus


For products such as Baader AstroSolar filters, the tube outer diameter is 81mm, which is suitable for This Size (#2469336) filter.


Dew Heater straps should be 10.25" or longer in length.  The Kendrick #2007 Dew Strap fits well at 11" heated length.




Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

Items that have been opened, damaged or are otherwise unsaleable will be subject to a minimum 10% restocking fee, to be assessed by Telescopes Canada upon receipt of the returned goods

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the 'Complete Orders' link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.


We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Typographical Errors and Order Cancellations

Telescopes Canada reserves the right to cancel an order due to an error in pricing by Telescopes Canada or one of our suppliers, equipment being no longer obtainable, or other events which are out of our control.

Client-Initiated Cancellations

Client-initiated order cancellations are accepted prior to delivery of the equipment to the customer, thereafter it is a return.

Questions & Answers

  • what dew heater do you recommend for this scope? Preferably one that will work with a USB batter pack as I don't want to purchase a controller (I am a begginer astrophotographer).

    This dew heater would work for it, it's 16.9" in length and USB powered

  • Is this good for taking pictures of the moon?

    The RedCat is a short focal length scope (250mm F/4.9) which gives it a pretty wide view of the sky.  The moon would fill about 40 to 50% of the view if taken with an ASI224MC camera.  
    Please see the attached image for a simulation of what the moon would look like.
    To have more magnification, a scope with a longer focal length would be used.
    This site was used to generate the view simulation:

    The Moon with a RedCat and ASI224MC