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Orion Optics OMC 140 Maksutov Cassegrain OTA

Price:  £678.00 (Inc. 20% VAT)Earn 678 Loyalty Points
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Model:  OMC140-1
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 140 Maksutov Cassegrain OTA
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Why is the OMC140 so special? and why has it built up a reputation over the last decade or so? . . . quite simply it is a quality instrument as far as optics are considered but, it is also mechanically excellent and stable and . . . Development, development and development, all done in conjunction with experienced amateurs and professional astronomers and two very experienced optics designers, Barry Pemberton and Harrie Rutten.

The OMC140 came into being as a challenge in achieving a wide field, photo visual Maksutov Cassegrain with incredible stability and versatility.
The project was a success and we judge that by considering the large number of these compact instruments we have in use in every continent of the World.

Why is it so successful? The design is not a standard all spherical one with a main mirror the same size as the corrector. That is the traditional Maksutov design but, it lacks off axis performance and suffers from coma. The OMC140 has an ellipsoidal primary which is over 12mm larger in diameter than the Maksutov corrector. This added aspherisation of the primary allows much wider flatter fields to be achieved but it virtually eliminates coma.

As you can see from the image below, the spot diagrams for the OMC140 are nothing less than spectacular and this illustrates a 30mm field


The carbon tube of the OMC140 allows almost perfect stability of focal length and strength. The unique cantilever focusing method ensures image shift/mirror flop are things of the past. We guarantee the OMC140 will give less image shift than a just a few seconds of arc, it’s that good, really. Focusing is carried out by means of a spring loaded micrometer thimble, coupled to the internal mechanism to give the most precise and the smoothest focusing action you could think of. People often say their focuser is "as smooth as silk", this one really is, it’s like butter smooth.

What do you get in your image quality? The best image possible for the aperture. The OMC140, because of its relative compactness regularly gets compared with larger Maksutovs and refractors, some costing over 8 times the cost of the OMC-140. We have not come across any refractor of the same aperture which outperforms it, if you know of one, please let us know.

The OMC140 is offered in two optical grades, the standard model and the De-Luxe model with Lambda/ 6 optics.

What do other people think about the OMC140, well, we were asked to enter it in a Sky at Night Maksutov competition a few years ago where it competed with some ‘scopes costing significantly more and, one larger in aperture. We’ll leave the closing comment of the review to answer that question… "the OMC140 deserved first prize for its high-quality views not just of planets but also of deep-sky objects. In the end it was those memorable moments with the Orion Nebula and Saturn with this telescope that swung our view in its favour"

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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!

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 all 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 available!

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..

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- - - Rother Valley Optics Ltd

01909 774 369