To fashion a solar filter for my Nextstar finder scope, I need a second lens cap. I have the correct solar filter mylar from a supplier. Anyone know where I might get one? Inside dimension is 59mm. Thanks, Ted
Lens Cap For 9 x 50mm Celestron finderscope
Posted 11 October 2019 - 08:27 AM
Agena Astro sells many sizes and several varieties of caps.
- wrvond likes this
Posted 12 October 2019 - 01:20 AM
Or just make the filter cell from poster board:
I've made 5 or 6 of them and they are still going strong after nearly 20 years of use.
Author of "The NexStar User's Guide II"
Author of "The NexStar User's Guide"
Author of "NexStar Observer List"
- havasman likes this
Posted 12 October 2019 - 06:22 PM
I made three the same way about 15 years ago. I added an "adapter" (foam insulation strip) to one and now they fit 4 of my scopes ... well actually 3 scopes and a finder. Simple, cheap, and so far have been very robust, and no front caps have been harmed.
Posted 13 October 2019 - 06:38 AM
Thanks for all of the replies. Hope to find one that works from the sources provided. Yeah, I'm aware it has to fit exactly right so there is no chance of it coming off. Made one for my previous Nexstar 8 and it worked fine for many years. Best to all from the Midwest.
Posted Yesterday, 08:04 AM
Summer of 2017, I made a solar finder cap from two cut-down spray can caps. I found a pair in my junk box that fit snugly one inside the other, with the smaller one fitting snugly onto the 9x50 finder. After I cut the ends out of both (Dremel tool with saw; leave a small lip on the larger one), I lightly taped a square of solar film over the smaller one, and glued it inside the larger one. The edges of the film are captured between the caps, and are held quite securely by the glue and lip. I strongly suspect that it's more durable than the slightly junky store-bought ones with the cardboard ring.
Yeah, I spend a silly amount of time avoiding spending ~$20. But I enjoy small shop projects, and I'm retired...
- mclewis1 and Ssayer like this