A set of two premium quality 1.25" parfocalising rings each one is 4mm thick for Cameras or eyepieces. Perfect for accurately setting focus distance for imaging or between eyepiece and camera swaps. Includes ball-head Allen key for easier adjustment at an angle tha straight cut keys. The rings are precision machined hard-anodised aluminium with 3x stainless grub screws for accuracy.
The grub screws don't rust, unlike black steel ones, and there are three instead of one, which means the ring doesn't tilt so it's more accurate. Each ring is precision machined at a thickness of 4mm.
Parfocal rings are very useful to get course focus between a 1.25" camera (like Altair GPCAM) and a 1.25" telescope eyepiece, so you can use the eyepiece to center an object and then swap with the camera to get it in the field of view. Then you can fine-focus the camera and away you go. No more hunting around for objects with camera in place.
For visual observing
Most eyepieces have different focal points. Parfocal rings let you swap quickly between, say a low power and high power eyepiece without having to refocus. Quick and convenient.
Some guide scopes don't have focusers. You can use a parfocal ring to match the focus point on the camera and guide scope. Then once you are focused, you can remove the camera and replace it without having to refocus, saving time.
Very Happy 4mm thickness gives more focus travel on the eyepiece barrel than on other makes. This Allen key fixing is preferred to the knurled knob type because you could loosen it by accident in the dark thinking it was one of the eyepiece holder knobs thus loosing your Parfocal position for the ring. (29/06/2018) Paul Allen - WOKINGHAM
Please order by December 18th at the latest for xmas - we close on Friday 20th December and re-open on Thursday 2nd January 2020. Our delivery charge for most of the UK is £2.95. All orders are shipped promptly, lower value items are sent Royal Mail 1st class and higher value or larger goods are shipped via reputable courier. All goods are shipped fully insured with FEDEX, UPS, DPD, DHL and Royal Mail, we do not use budget courier services, we can only ship to UK mainland addresses and are not able to ship to forwarding agents or PO boxes.
Our Order Lookup system (see very top of each page for the icon and link) updates the order status in real time for you - simply by entering your order number and postcode..
We ship each business day, orders received before lunch are normally shipped that business day. We also direct ship from our UK suppliers, this means we have access to thousands of products that can ship fast to our customers.
Deliveries to UK mainland addresses are all shipped with fully insured premium services for £2.95, *some exceptions apply including many AB, FK, HS, IV, KA, KW, PA, PH, ZE postcodes. We will quote delivery charges to these areas where applicable prior to shipping (this does not normally affect lower value items shipped by Royal Mail).
You must inform us within one working day if the goods are lost or damaged in transit so that we can make a prompt claim against the delivery company and correct the problem. Please ensure all address details are accurate, we cannot be responsible for failed deliveries or losses arising from incorrect delivery addresses.
You agree that proof of delivery supplied by our delivery company is sufficient evidence to establish that goods have been received.
If your product is sent by Courier they will attempt delivery twice and a signature will be required. If they are unable to deliver because you are not available and after 5 days you have not contacted them to re-arrange. the goods will be returned to us and the return delivery costs may be charged to you