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Orion Optics OMC 200 Maksutov Cassegrain OTA

Price:  £5,599.00 (Inc. 20% VAT)Earn 5,599 Loyalty Points
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Model:  OMC200-1
Brand:  Orion Optics UK

Please be aware most Orion Optics telescopes are made to order and can take up to 6 weeks. Please contact us to find out availability.

Orion Optics OMC 200 Maksutov Cassegrain OTA
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In the late 90’s we brought out a bigger brother to the very successful OMC140 Maksutov Cassegrain, the OMC200. This telescope was designed purely for planetary and lunar observing.
It was a typical planetary telescope designed around the design my good friend Harrie Rutten devised, the Rumak.

The Rumak uses a separate secondary mirror, this enables a greater amount of flexibility in the design, it also allows a major feature of any Maksutov to be ‘miniaturised’, the secondary mirror. Typical Maksutovs have secondary mirrors which vary in size from around 26% up to a rather large, 45%. The OMC200 has a 22% secondary mirror, 4.8% obstruction to the light path.

What effect has this on the image quality? It enables a reflecting telescope to be as close as possible to a refractor’s performance in terms of MTF (modular Transfer Function) MTF is the data which determines how much low contrast detail can be seen in an image, e.g. faint bands on Jupiter. Telescopes with MTF curves which are less effective than the OMC200 reduce the amount of detail visible in an image.

MTF has nothing to do with PV wavefront accuracy, that can be measured on a Zygo for instance, MTF is far more difficult to measure but, the MTF plot of the OMC200 and the PV wavefront results guarantee you an incredible journey into the best planetary and lunar views you might possibly ever see in an Earth based telescope.
(see RMS Spot Radius vs Field Plot below)

Why did we stop making it then?
The corrector lens in an OMC200 has to be virtually flawless. The corrector glass we were buying initially when making the OMC200 fell into this category but, it later declined in quality and we had to discontinue production rather than send out any slightly below perfect telescopes. We have now received samples from a new supplier and have successfully put 5 pieces into work for customers. As a result of this we are now in a position to offer again this superb telescope.

User review OMC 200 f20

I have used many quality telescopes in my years in astronomy: TMB 152 Refractor/Takahashi FS 152 /10" TEC Mak cass and many various designs but I must say the OMC 200 is one of the very best planetary/lunar telescopes I have ever used - the contrast needs to be seen to be believed!

The views of the moon/planets are jaw dropping. On one particular night I decided to set up the OMC up at the side of my TMB 6" refractor expecting the refractor to out perform the OMC 200 by quite a considerable margin but, to my surprise, the out performing was done by the OMC, the scope was showing detail on Jupiter that was stunning (that's not to say the views in the refractor were bad) it's just the detail seen in the OMC was that much better.

Tom Yates (Wigan)

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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. 

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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


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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