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Tiny Clanger

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Tiny Clanger last won the day on November 12 2021

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  1. There's a reduced price BST 12mm at FLO https://www.firstlightoptics.com/bst-starguider-eyepieces/bst-starguider-60-12mm-ed-eyepiece.html , or keep an eye out for a used one, typically BSTs go for £35 ish second hand.
  2. I'll have a guess that it's a Bresser 'scope with included plastic-y solar filter ? I had the same thing included with a 102 Bresser refractor I bought. I'd already had a little experience of white light solar with a smaller 'frac and Baader film/home made holder, and was so deeply unimpressed with the fuzzy low contrast image and orange cast with the Bresser filter, that the thing went straight back in the box, never to be seen again until I got the packaging down from the loft when I sold that 'scope. I made a filter from the Baader visual film I already had, it really is streets ahead. I don't think Bresser's included orange filter is a danger to eyesight, but it's a poor substitute for the good stuff !
  3. Try https://archive.org/details/manualzilla-id-7345459
  4. It gets more complicated than just magnification though ! There's also exit pupil (essentially the diameter of the circle of light a 'scope/eyepiece combo presents to your eye) which affects what you can see : a mid range mag. eyepiece might seem pointless but it can help get a good contrast between the perceived brightness of the deep sky object you are looking at and the background sky around it. Your eye also has an exit pupil range it can accommodate, which varies from person to person. There's plenty of explanation to be found about this, I'd start here : Heather
  5. I mention the specific type of strip in that comment. Online search saved me ferreting through the shed !
  6. I've had a look through the photos I've uploaded before, here are some showing where I put the finder this angle shows the RACI is located so it parks neatly between the RDF and focuser when the 'scope is closed. If I can find the package I'll let you know what brand I bought.
  7. Me too, but I managed to do it on my heritage 150 with no problems. Took the primary out (I marked the orientation of the collar with masking tape so I could replace the cell the same way, hoping to reduce the re-collimation. It hardly needed more than a tweak .) swathed the secondary in j cloths & a plastic bag plus more masking tape, obviously with the front section opened out. Marked the holes needed on yet more masking tape, drilled with a brand new metal bit - it was my first go drilling anything metal - turned out to be easy. In order to decide where to place the RACI I temporarily fixed the shoe on the 'scope tube with double sided foam glue strips - the sort of thing used to stick number plates on cars. I cleaned the surface with isopropyl alcohol first, and the strips held so firmly the shoe took the weight of the RACI easily with just a little give (because of the elasticity of the foam) . The location I chose worked well, and the foam pads were so good that I left them doing their job for a few months while I worked up the nerve to drill. Heather
  8. I'm not 100% sure about the AZ4, not owning one, but I think it uses a 10mm bolt from the tripod. The AZ5 I know has a 3/8" photo standard tripod to head bolt fitting. Check which your tripod has ( skywatcher make both types) , you might have to get an adaptor if there's a mismatch . For M10 tripod to 3/8" head there are £39 astro essentials adapters available from FLO, but the other way round, 3/8" tripod to 10mm head adapters seem to be rare creatures ...
  9. https://apod.nasa.gov/apod/ap200722.html is simply explained. https://www.wired.com/2013/03/why-is-a-comets-tail-curved/ includes some mathematical modelling .
  10. It's a really useful little book, I bought a second hand copy (via amazon, I don't recall who the actual seller was) for under £10 ages ago, and when I saw one going for £5 locally I snapped it up for friends. I'd not pay £28 though, I'd prefer a copy I wasn't worried about using at the telescope where it is bound to get damp. Wait a bit, keep an eye on Amazon and Abe books etc, a second hand one will be on offer at a sensible price eventually. Meanwhile, if you've not already done so, the free downloadable Virtual Moon Atlas can be set to show you your 'scope view, the phase, and lists the interesting features near the terminator https://sourceforge.net/projects/virtualmoon/files/latest/download I use VMA and the book, they complement each other.
  11. It would be polite to state the sources of the material, crediting Gary Parkerson and Wolfgang Rohr at the very least. I note the copyright symbol the latter has added to his photos, so it should not be reproduced, just linked to.
  12. Me too, I've got 'The New Challenge of the Stars'(1977, the £4.95 sticker still on the cover) and 'Hardyware, The Art of David A Hardy' from 2001, well worth hunting down if you don't already have it. I was unreasonably pleased to find he lives a few miles from where I did before leaving for uni. still going strong, he must be well into his 80's now. He has a good website https://www.astroart.org/ ,
  13. Yep, if I was buying my first mak now (instead of during lockdown when the things were rare as rocking horse manure) I'd prefer the Bresser 127. The only reservation I have with the Bresser refractors is the non-standard finder shoe (and comically bad supplied optical finder) but it looks as if their mak comes with an RDF, which is all you need to point at the Moon anyway.
  14. I think it's a variation on L.G.M.
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