Brand
Parts for a mount that already exists
Several Explore Scientific products on this site name the mount they are for rather than a size: a counterweight for the iEXOS-100, a polar scope for the iEXOS-100. That is more useful than a diameter, and it is also narrower — the part is right for one mount and unspecified for the rest.
An 8x50 illuminated finder with its reticle and eye relief published, a UHC filter with its passband given. Both publish the figure their shelf is compared on.
The Astro R-Lite belongs to a shelf judged on its minimum rather than its maximum: what matters for a red torch is how far down it dims, not how bright it gets. Its listing gives a continuously adjustable dimmer and a runtime.
Check whether the part names a mount or a measurement. The first is precise and narrow; the second travels.
8x · 50 mm · illuminated reticle · upright image
An 8x50 finder with an illuminated reticle and an upright image, listed in two short lines.
Best for: Centring faint objects, where a dark crosshair on a dark sky is unusable
≈ £149 / €146
UHC · passes 486, 496, 501 and 656 nm · 1.25 in
A 1.25 in UHC filter that publishes the emission lines it passes: hydrogen at 486 and 656 nm and oxygen at 496 and 501 nm, blocking everything else.
Best for: An observer who wants to know what a filter passes before buying it
≈ £58 / €58
A 1 kg counterweight for the iEXOS-100, published with all three of its dimensions as well as its mass.
Best for: Fine-balancing an iEXOS-100 after adding a camera or a guide scope
A black anodised red torch with an adjustable dimmer, bright and dim continuous modes, a flashing mode and a 360-degree side signal, published at 105 g.
Best for: Reading a chart at the eyepiece without losing dark adaptation
A dew cap for the Telrad projection finder, preventing the projection window fogging and covering it when the finder is not in use.
Best for: A Telrad owner whose finder fogs before the telescope does
Five threaded extension sleeves of 30, 20, 15, 10 and 5 mm, all M48 × 0.75, for fine adjustment of back focus in an imaging train.
Best for: Dialling in the exact sensor spacing a reducer or flattener demands
A polar scope for the iEXOS-100, listed with a clear explanation of when precise polar alignment is needed and when it is not.
Best for: An iEXOS-100 owner moving from visual observing to photography
Any figure written into the body of this page was true on the day it was written. The amount shown next to each instrument is requested from the retailer as the page loads, and it is that amount, not the text, that stands.
