Filter Cartridges

Oregon Star Party 2019 and Beta Drifter

It’s been a while, so there are two big things to cover. #1, showing off the beta Drifter at Oregon Star Party. #2, yes the beta Drifter is born–what’s been changed and how does it work? Oregon Star Party 2019 came and left quicker than Oumuamua but what an incredible weekend! Analog Sky set up…

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The Moon, Updated Focuser and Tertiary

I had an observing session last week where we got clouded out pretty quickly–however it was still a transcendent experience due to the fact that we were approaching first quarter of the Moon. I trained the Drifter on the Moon as it approached the horizon. An opaque cloud cut straight through the middle, its edges…

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Analog Sky Drifter Prototype 1 Notes

So it’s been a while since I updated this blog. That’s because the Drifter prototype 1 was finished 8-12 months ahead of schedule, in time for Oregon Star Party (OSP) 2018. I was too busy building it to post any updates. Many thanks to Jerry Oltion for helping me out of three or four jambs,…

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Tertiary Housing Beta 1

Imagination. Reality. Here’s a completed tertiary housing. All the pieces connect well. The mirror mount works very well. The focuser works in the housing. The filter cartridges still need some tweaking. Using a screw for a friction fit doesn’t work since the cartridge just pops out from the pressure. However, using the screw in a…

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Filter Cartridge Progress

While waiting for focuser pieces in the mail, I’m working on the filter cartridges: A few new features. First, chamfers around the edges. Second, finger holes at the top to help with screwing/unscrewing filters. Third, pattern on the triangular corner to help with grip and distinguish cartridges (and therefore filters) in the dark. Cartridges will…

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Filter Cartridge Adjustments

The focuser has been moved up to accommodate the filter cartridges (seen here in gray). They have been increased in height to 13.5 mm, a little over half an inch. The filter will sit entirely within the cartridge. This means cartridges with inserted filters can be kept safely in a foam-filled accessory case without any…

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Filter Cartridge Prototype Progress

Prototype 1 of the filter cartridge is nearing completion. Here you can see its place just above the tertiary mirror and below the focuser. It will slide quickly into and out of the tertiary housing. The triangular tab seen in the bottom corner will be textured for two reasons. One is for better grip. The…

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Filter Cartridges

Have been working lately on the filter cartridge design, since it affects the position and design of the focusers. Filters are a pain to use on a dark night. They are delicate, fragile, and easy to smudge, scrape, or drop. So you keep them in cases that snap or screw tightly, which are difficult to…

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