ASTRONOMY & OPTICS

Binocular Collimation Quick and Easy Method without Prism Adjustment

I was initially put off from correcting an optical fault in an old pair of Porro prism binoculars because all I had seen or read online involved prism adjustment...read more

Home-Made Locking Solar Filter

How to make a robust, lockable solar filter for your telescope from repurposed materials and purchased AstroSolar film. This will allow you to enter the amazing world of solar astronomy...read more

How to make a solar finderscope from scrap


It was whilst I was making the solar filter for my telescope that I seriously started to think about how I was to find the object of study in the eyepiece....read more

World War 1940s Binoculars - Perfect for Astronomy & Birdwatching

Despite their rough and ready appearance, WWII Binocular optics were actually manufactured to a very high standard. The companies who made them saved on the casings and strappings but were required by the Armed Forces to furnish precision....read more

Collimating World War 2 Binoculars

Unlike the more modern pair I collimated, the objective lenses on these could not be easily rotated in their respective cells.  I was thus faced with the possibility that I would have to resort to prism adjustment and this I was loathe to do! It was at this...read more

Table Top Binocular Collimation Part 1 Materials & Fabrication

Following on from my previous collimation experiment, I decided that in the Winter it would be much better to be indoors! However, this was quite a challenge on many levels...read more

Table Top Binocular Collimation Part 2 Modifications

I observed that true to the laws of physics, once the collimator lens was set at a distance from the cross wire reticle equivalent to the lens’ focal length and the light was turned on, the image of the wires were in focus in the binocular eyepiece...BUT...read more

Table Top Binocular Collimation Part 3 The Experiment

Following on from my previous collimation experiment, I decided that in the Winter it would be much better to be indoors! However, this was quite a challenge on many levels...read more



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