Priscopic Prism Company Scope and Mounts.

[Peter Laidler]

Richard, can I offer you a bit of advice before you embark on your telescope project. Feel free to ignore it of course, but it is based on long learned experience............. It seems to me that you have two ocular lens assemblies, both of which are enclosed in roll-sealed cages. Just be warned that as soon as you take these apart (more later), separate, clean and re-cement the lenses and re-house in the cages, then you will need to refocus the graticle and then the image because your action will have changed the focal and optical properties of the lenses because you have effectively changed the refractive index of the double lens .

The next thing is this.......... The FLINT part of the double lens configuration is VERY hard glass and will crack or chip, externally or internally as soon as you look at it!!!!!!! Worse still, it can 'scatter' internally caused by internal previously unseen fault lines within the glass. So treat the lenses as gold dust, made from the finest unobtanium mined in the mountains of Utopia.

On a personal note, I wouldn't re-pack into roll-sealed cages but I'd adapt the ocular lens system to mimic the No32 Mk1 free floating lenses, using spacers to take up any side or end float.

If, like you, I hadn't attempted such a job before, I'd get a couple of cheap old telescopes off ebay to practice on

But just be VERY careful