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Narrowband

Art McConnell

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  • Gender
    Male
  • Interests
    Spiritual
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    NW Arizona

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  1. Thanks for that info. Didn't know about in-travel adapters. I now know my 2" to 1.25" adapter is a High Hat, which is supposed to give a 16.5mm rise, but my dial calipers show me a full 19mm rise in my own adapter. So that should fix me up with my Newtonian, which has a 2", low profile helical focuser. I built that scope, and chose that focuser because I wanted a wide(er) field of view for objects such as Andromeda galaxy. I was not disappointed.... But as for my BT-70s, might I find a different (brand? magnification?) reticled eyepiece that will perform better in them? Otherwise, it's to the machine shop with my Sbvony.....
  2. I bought a Sbvony illuminated double reticle 12.5mm Plossl eyepiece and I can't get the star to focus. Eyepiece all the way in, focuser all the way down, and with the reticle focused clearly and I have a star image that is useable for centering but still quite out of focus. If I then run the reticle focuser in, the star image comes into clearer focus, but never sharp. At some point the reticle becomes useless, and I try to split the difference. I get this same behavior with this eyepiece in both my BT-70 binoculars and my 8" Newtonian. Is it me or the eyepice? I'd like to use this eyepiece for viewing also, but it needs to focus.
  3. I had a large non-first surface mirror on it first, cut a cardboard template to cover all but what was needed. 6x9 was as small as I could go, and still use my laser pointer, which had a slight vertical offset from my optical axis. I had my 6.3mm plossl in it this morning, and the moon was as clear as I could expect it to be. With a F/L of 400mm, it would have been about 63x. Just fine for deeper wide field viewing. The mirror was $79 plus shipping, less than $100. I got the mirror here: https://firstsurfacemirror.com/glass-first-surface-mirror/ with
  4. Except for the price of the binoculars and a good mirror, mirror mounts are easy and cheap to build. Since one advantage of binos is the wide field of view, the limited magnification of less expensive mirrors ( I got a one wave for under $100) is not so much of a disadvantage for wide field wiewing. The ease and speed of sweeping through a dark star-filled sky makes my mirror mount a joy to use. This is what I did with my BT70 binoscope (everything but the mirror and binos came from my scrap pile): The pedestal is height-adjustable (one pipe in another), and mounted on a lazy susan-type turntable off an old swivel chair, rotates 360 degrees. I just came in from viewing the moon at 63x, and was pleasantly surprised at the clarity of the image my 1 wave mirror produced.
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