Shop by Price
Shop by Brand

Altair Imaging Ready 2" Herschel Solar Wedge

Altair Imaging Ready 2'' Herschel Solar Wedge
Altair Imaging Ready 2'' Herschel Solar WedgeAltair Imaging Ready 2'' Herschel Solar WedgeAltair Imaging Ready 2'' Herschel Solar Wedge
Price:  £250.00
List Price:  £339.00
Saving Of:  £89.00
(Inc. 20% VAT)Earn 250 Loyalty Points

Brand:  Altair



Low Stock, Please Confirm Before Ordering

2 Year Warranty On All New Items

The Altair Solar Wedge (Herschel Wedge) replaces the normal 2" mirror or prism diagonal at the rear of your refractor telescope. The Solar Wedge transmits a greatly reduced, safe amount of light to the eyepice or camera.

This makes it safe for both visual use with an eyepiece, or astrophotography with a CMOS camera such as the Altair GPCAM or Hypercam.

Solar wedges are well known to give a sharper, higher-contrast image than traditional metallized solar film or front-mounted glass solar filters, by eliminating reflections between the filter and front telescope lens. The result is a sharp, very high contrast view of sun spots and solar surface granulation.

The Altair Solar Wedge has special anti-reflection coatings on the internal polarising filter and prism. A high specification prism gives the ultimate in sharpness and resolution for imaging and observing.

Compared with normal solar film filters, the improvement the Altair Solar Wedge offers is dramatic. Sunspots appear a much darker black against the surface of the sun, with the grey area around the sunspot being very separate and distinct from the darker central area. Many who have never seen fine surface granulation before will see it easily!

Key Features:

Wide brightness adjustment range allows imaging AND visual use - in one unit.
High quality, large prism.
115mm backfocus / optical path length enables use with most refractors.
Anti Reflection (AR) coated prism and polariser.
46mm clear aperture.
Quick, easy centering of the sun with glowing spot on rear diffuser.
Does not become as hot as other models, thanks to rear energy diffuser.
2" "Positive Lock" compression ring for fast accessory changes.
Includes 2"-1.25" adapter.
Sturdy CNC machined casing to hold heavy binoviewers or a DSLR camera, filter wheel etc.
Comprehensive Altair Solar Wedge instructions (opens new window).
Safe and easy to use: Unlike cheaper solar wedges which overheat or worse, direct excess energy downwards into the ground, the Altair Imaging-Ready Solar Wedge directs energy into a special extra thick Polycrystalline Ceramic diffuzer disc at the back of the Wedge. Air vents allow air circulation by convection. The Polycrystalline disc has the added benefit of acting like a "solar finder". The sun appears as a "ball of light" on the back of the disc - simply move your telescope until the ball of light is in the centre of the disc, and you are aligned with the sun! Read the Altair Solar Wedge instructions here (opens new window).

One wedge does it all! Both solar photography or visual observation: Often solar wedges don't give enough light for high speed exposures needed to "freeze" air-motion for a sharp image. The Altair Solar Wedge has an AR coated internal polarising filter, which let's you control the brightness of the image. Brightness can be increased or decreased by rotating the top assembly, then locking it in the desired position with a side thumbscrew. Variable brightness is very important both for visual and imaging use, to fine tune the ideal exposure time, or the ideal contrast levels at the eyepiece - especially when adding a colour filter such as a green continuum filter for extra contrast. Unlike other makes, the Altair Solar Wedge enables both visual and imaging applications without having to change internal filters. With the solar wedge in "bright" mode, exposure times as low as 2 milliseconds are routinely possible with high speed CMOS cameras like the Altair Hypercam or GPCAM. This effectively "freezes" the seeing (air movement) resulting in an incredibly sharp image.

Here's a 500 frame image of a sunspot group imaged with Altair Solar Wedge by Nick (Altair) during 3rd round of prototype testing on 07-18-2016 @ 12:29:22. Camera - Altair Hypercam IMX174, Altair Flat Field Barlow, with a prototype 125mm ED refractor. 500 frames stacked in Autostakkert, and processed in Registax.

Q: How do I observe the sun safely with a telescope and filter or Solar Wedge? If you view the sun through a telescope or binoculars without a professional filter product, immediate and permanent eye damage will result. This has discouraged people from exploring this fascinating subject, however observing the sun is perfectly safe, provided you use your filter equipment correctly. Each wedge ships with instructions which must be read and understood completely before using the product. Never allow children to observe the sun with a telescope and wedge or filter without the supervision of a knowledgeable adult. Never remove a solar filter or wedge without first placing the front lens cap on the telescope. Always securely fasten solar filters or Solar Wedge securely to the telescope. Always remove any optical finder from the telescope before pointing it at the sun because you could inadvertently look through it. (Use the safe Altair solar finder with Solar Filters or Wedge. Code: SOLARFINDER).

Q: How do I set up the Altair Solar Wedge safely?

A: Safe setup procedure:

With the front objective lens caps still in place. Remove the finder scope from the telescope and replace it with a safe non-optical solar finder such as the Altair Solar Finder. (Code: SOLARFINDER)
Add the Solar Wedge in place of your existing 2" diagonal mirror. Screw the included Neutral density filter into the base of a low-power 1.25" eyepiece and insert it into the included 1.25" eyepiece holder on the back of the Solar Wedge.
Point the telescope at the sun until it's centred in the solar-finder.
Remove the front lens cap from the telescope. A glowing ball of light should appear on the translucent disc on the rear of the Altair Solar Wedge. Move the telescope so the glowing ball of light is centred on the disc.
Approach the telescope, and look through the eyepiece. If the image is too bright, loosen the locking thumbscrew and turn the turret top until it's a little dim. Fasten the locking screw in this position and remove the eyepiece. Remove the neutral density filter and replace the eyepiece.
You can now fine-tune the brightness further by rotating the turret-top and locking it. You will find that high power eyepieces require a little additional brightness compared to low power ones, which is normal.
Q: What telescopes can I use with a Solar Herschel Wedge? A: Only refracting telescopes up to 6" (152mm) aperture can be used with the Altair Herschel Solar Wedge. Refracting telescopes have a front objective lens, and rear eyepiece. It is dangerous to use ANY telescope with mirrors with a Herschel Solar Wedge due to the risk of fire and excessive heat from reflections within the tube. This includes Maksutov Cassegrains, Schmidt Cassegrains, Newtonians and Ritchey Chretiens, amongst others.

Q: Will the Altair Solar Wedge come to focus with my refractor telescope? A:The Altair Solar Wedge has an optical path length (also known as "backfocus" of 115mm from the front telescope facing side (excluding the 2" barrel) to the top of the 2" turret where the eyepiece or camera is inserted. This is similar to most 2" mirror diagonals, and shorter than most other solar wedges to maximise compatibility.

Q: Can I used coloured filters like solar continuum filters with the Altair Solar Wedge? A: Yes you can but only if added AFTER the wedge. NEVER add ANY filter in front of a Solar Wedge (..e. between wedge and telescope) because it will crack or melt due to the concentrated heat from the sun, damaging the inside of your telescope.

Q: How do I "tune" the image brightness for imaging? A: When imaging the sun using "lucky" imaging techniques with a high frame rate camera like the Altair Hypercam, it's best to keep the exposure duration of the camera as short as possible - ideally under 10 milliseconds is ideal, though less than 5ms is even better. This "freezes" air motion to show granulation and other small details. Being designed for visual or imaging use, the internal polariser module (controlled by rotating the turret top) has a wider brightness range than normal Hershel wedges allowing fast frame rates and short exposure duration. When set for fast frame rates, the image can appear very bright visually through an eyepiece - like looking at a light bulb. This is uncomfortable, but not dangerous due to the protective ND filter inside the unit allowing 0.1% of light through. Therefore, an additional 1.25" neutral density filter is provided, which transmits 75% of light, blocking 25% for initial focusing and setup with an eyepiece. When you first set up the Wedge and align it with the sun for visual use, you should add the provided 1.25" Neutral Density filter to the eyepiece, then rotate the turret-top until the image is quite dim. Once you are satisfied with the balance of contrast and sharpness, lock the polariser locking thumbscrew, and you are ready to observe. If using the wedge for imaging only, you can just insert the camera and turn the turret-top until you are satisfied with the exposure duration and gain settings.

Q: For how long can you keep the wedge aimed at the sun? A: The Altair Solar Wedge has been fully tested with the sun remaining in the centre of the field of view for 5 hours of continual exposure with a 6" (152mm) aperture refractor in mid-summer in the UK. At no point did the outer prism housing become too hot to touch, a problem common with other wedges. Whilst we cannot recommend use with telescopes of larger than 6 (152mm) aperture for longer or shorter duration, if your telescope is larger, then we suggest trying the wedge for a short time initially, to assess the heat build-up and make your own informed decision.

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 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 774 369