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Lymax CosmicOne SCT Cooler R3 Catadioptric Telescope Ventilator

Lymax CosmicOne SCT Cooler R3 Catadioptric Telescope Ventilator
Lymax CosmicOne SCT Cooler R3 Catadioptric Telescope VentilatorLymax CosmicOne SCT Cooler R3 Catadioptric Telescope VentilatorLymax CosmicOne SCT Cooler R3 Catadioptric Telescope Ventilator
Price:  £129.00(Inc. 20% VAT)Earn 129 Loyalty Points

Model:  L8R3COOLER
Brand:  Lymax

2 Year Warranty On All New Items
(Excluding Batteries & Globes)

Catadioptric telescopes or SCT's have closed optical tubes at the front. These closed tubes are great for keeping the optics clean, but they prevent air circulation. This lack of circulation limits conductive heat transfer and greatly prolongs the time required for the optical tube to reach the ambient outdoor temperature. The temperature differential between the telescope and the surrounding air cause "heat pillars" and "tube currents". These tube currents cause distortion similar to the wavering mirages you might see on the road on a hot day. Until the telescope tube and the optics it houses reach a temperature close to that of the surrounding environment, it will not give the best images. In fact, fine details on planets or in deep sky objects may be completely invisible while the scope is warm, but they are easily visible when the scope is at ambient temperature.

The CosmicOne SCT Cooler is a device for ventilating the inside of SCT telescopes so that they may be brought quickly to ambient temperature. This allows image ruining tube currents and heat pillars to be minimized in 10-20 minutes instead of the usual 45 - 60 minutes. The greater the temperature difference between the place your telescope is stored and the outside evening air, the more quality viewing time you can reclaim with a CosmicOne SCT Cooler. The SCT Cooler has a filtered air intake and other design features whcih minimize the possiblity of dust infiltration and direct the air flow away from the internal optical surfaces.


Quickly brings SCT and similar telescopes to ambient temperature
High quality, high output ball bearing DC fan with polarity and thermal protection
Modular construction allows one unit to be used with several telescopes - just change the tube
Air delivery duct made of durable nylon based plastic prevents nicks and scrapes
Specially designed air ports direct ventilation away from optical surfaces
Dust filter help keeps optics clean
Machines blower body works with 1.25" visual back or SCT to 2" adaptor
Power from any 5v USB charger or battery pack
Spare filter and allen wrench included

Please click here to see a review of the Lymax SCT cooler. Please note the version he is reviewing is the R1 cooler. The model we are selling is the R3 which is a greatly improved model. 

Be the first to Write a Review for this item!

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 1pm 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. We don't ship all items internationally. It is at our discretion what we ship outside of the UK. 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!

Please note this scheme is online only. Customers who order via the telephone can still be added to the scheme manually. Please ask for more details on this. Before placing orders online, please make sure you are registered with us first otherwise your points won't be allocated.

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

Rother Valley Optics


Finance is now available on most products above £250! We offer 12, 24, 36 and 48 months with a fixed 15.9% typical APR. Please note this can't be done through the website at this moment in time. You will need to email us or drop into the shop to sort out finance. As long as the item is above £250, finance is generally available!

Please note some items are NOT eligible for finance. Please contact us for eligibility first. 

Please get in touch with us today to find out if you're applicable.

You must be over 18 years to apply, live in the UK, have a valid UK bank account and not be bankrupt. Your credit file will be searched on application to see if you are eligible.

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..

If you have any questions about this, simply give us a ring or drop into the shop for a chat.

- - - Rother Valley Optics Ltd

01909 774 369