Home > Astronomical Telescopes > Altair Astro > Refractor Series
Model: SW70EDQ-RBrand: Altair
Generally In Stock, Please Confirm Before Ordering
NEW Improved v2 Model, with new CNC focuser:- Camera Tilt Adjuster- Camera Angle Adjuster / Rotator (CAA)- Rear M48 Adapter direct thread with threaded cap The Starwave 70 EDQ-R refractor has a four-lens system to give a flat field image circle of approximately 42mm at 350mm focal length, with a focal ratio of F5). Premium Japanese ED S-FPL53 glass is used for excellent colour correction. Super-high transmission coating (STM Coating) is used on all air-to-glass surfaces to ensure high contrast. The telescope tube is made from light weight aluminium alloy with CNC machined components. A tough matte pearl powder coated tube and hard-anodised fittings give durability and great looks. The Starwave 70 EDQ-R Quad APO is intended for astro photography and the focuser terminates in an M48 Male threaded rotator plate with locking thumbscrew. All screws are teflon tipped and grip on a flange for accuracy. The rotator plate includes a "push-pull" tilt adjustment system to enable you to square up the image sensor to the focal plane. No extra flatteners are required and the camera sensor is automatically at optimum spacing when focused on infinity. The backfocus from flange to sensor is 66.78mm with the tilt adjuster at zero tilt. The focuser is a good quality rack and pinion unit which has been modified to improve rigidity. Recommended accessories:Altair Hypercam cameras are en excellent match, especially the Hypercam 183 Series 20mpx cameras. Simply attach the camera with an T2-Thread Female to M48 Female adapter, or even screw the 2" nosepiece directly to the M48 male thread on the back of the focuser (the nosepiece has an M48 female filter thread nn the front).You can attach a DSLR by means of the Altair M48 Canon or Nikon DSLR adapters. (Ensure the inner ring grub screws on any M48 DSLR adapter are tight to reduce the chance of tilt).For DSLR use, a clip filter is recommended to control light pollution.The rack and pinion focuser is compatible with Pegasus motor focusers enabling full autofocus control using various programs, including SharpCap.For dew control, and to reduce the chance of the outer metal tube losing heat faster than the lens elements and constricting the unevenly, or internal condensation forming in the air gaps between lenses, we recommend the high power Dewzapper "DSLR" heater, product code DEWH-34-DSLR is used. In winter time the dew heater is best left on running at the upper temperature range to keep the whole OTA warm.For autoguiding and super accurate polar aligment (with Sharpcap's polar align feature), you simply can't beat the Altair Astro 60mm Guide-Scope, or the Altair Starwave 50mm Guide-Scope, and any of the Altair GPCAM camera range. The best configuration would be a side-by-side using the Starwave 110mm Guide scope rings and 200mm Vixen-format Dovetail bar (code: SWGSR-110-200) and dual Vixen dovetail bar kits. (Code: SW-DUAL-VBAR-230MM) Altair staff comments - the flat field quad story so far: We have always been aware of the demand for a flat field APO for wide field imaging, which can outperform camera lenses in colour correction, and be used with fitler wheels and dedicated astro cameras, while being sensibly priced, and with good QC. A while ago, we were offered some fast focal ratio multi-element refractor designs which had potential for flat-field imaging. We tried design variants using both four, five and even six elements and a range of glasses. These designs placed too much criticality on tolerances. The ability of the lenses to absorb tension caused by temperature changes was not considered practical for use in UK conditions. Stopping down the aperture of the prototypes helped somewhat, but we felt that a different approach was really needed on many fronts, not just optically, but mechanically too. Needless to say we passed up on these designs, and are very glad we did. Back to the drawing board then, or in this case, Zemax optical modelling software. The Starwave EDQ quad lens uses a more "relaxed" optical design, resulting in a wider tolerance envelope for both internal and external aligment of elements, as well as better colour correction across the field (with excellent control of "blue bloat" on bright stars than any design we've worked with so far). This is due to the use of not one, but two ED lens elements. Vignetting is minimal and only starts to show in the corners of a full frame 35mm field. Some slight star-elongation is also visible with very small pixel cameras if the image is undersampled and blown up to a very large scale, but in our opinion this still improves on big-ticket camera lenses costing about 5 times the price as well as larger quads costing more than twice the price. Lens cells are designed to absorb the inevitable tensions caused by contraction of the outer tube as best as possible. We believe the result is a fast, tractable system, which is more tolerant of temperature changes than other designs we've tested. However, the fact is that there is no design capable of perfect performance at any temperature. This is because glasses conduct heat up to 400 times faster than aluminium. For this reason, amongst others, we do recommend warming the optical tube for the best possible performance when using this scope in extremely low temperatures, a general rule which applies to any multi-element APO or camera lens employing ED glass in very cold conditions. Warming the tube is easily done using the right dew heaters (Dewzapper 3-4" high power dew heater, code DEWH-34-DSLR), and to sum it up, it's very advisable for these main reasons:Firstly, dew control. It is almost unheard of to operate an imaging scope in the UK without condensation forming on the front lens very quickly as temperatures plummet. As with any telescope, the optics perform best when they are all more or less the same temperature relative to each other and their housings / cells (as we explained, various components have different expansion coefficients depending on materials used). With the elements being spaced within a tube with air gaps between them, keeping the unit warm overall stops any possible condensation forming on the inner lens surfaces.Because aluminium alloys lose heat around 400 times faster than glass), it helps reduce any sharp temperature gradients between the glass elements and their metal housings for better overall performance.Finally, maintaining a constant temperature is essential to keep focus during a set of long exposures. Small pixel cameras tend to be used with flat field scopes like this, and changes in focus are immediately obvious.
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 email@example.com.
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 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 firstname.lastname@example.org