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John

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About John

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    Perfectly Normal Beast
  • Birthday 21/02/60

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    North Somerset, United Kingdom

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  1. Excellent report Stu What a wonderful opportunity to try two superb scopes out side by side. Gavster has a Tak FC F/7.4 as well as the F/9 I believe - lucky chap !
  2. Here is an interesting link. It's a collection of classic telescope catalogues which covers about 100 years but has quite a few from the 1960's, 70's and 80's. This should give you some idea what was about back then: https://web.archive.org/web/20160201112755/http://geogdata.csun.edu/~voltaire/classics/
  3. 365 Astronomy: http://www.365astronomy.com/18mm-BST-Explorer-ED-Eyepiece.html They put them under the Lacerta brand but they are the same eyepieces.
  4. I thought it was going to be like that here too. Much lower than Rigel and it's hopeless because of fog forming. If that rises up then I'll have to pack it in. Everything running with dew as well, which is a bit unusual here. The scope tube is made of this material called Kruppax which seems to keep the objective dew free even when everything else is covered. I've had the finder in a couple of times to let it clear. Still, at least there is stuff to be seen ATM.
  5. Conditions a little better now. Still on 14 Orionis. Primary is yellow orange to my eye, secondary blue / grey. Very, very tight but split is showing a little more often now and even when not split it's a clear unequal brightness binary star. One of the tightest I've ever split but this is only my 3rd session with the 130mm TMB / LZOS triplet. Some scope !
  6. I've got the 130mm triplet out this evening. Think I might be getting an intermittant split on 14 Orionis. The scope is a bit undermounted which does not help at 340x (!) but I seem to see a yellowish primary with a blueish, fainter, secondary tucked in very tight against the primary. The scondary star seems to "lead" the primary across the FoV toward the west in my undriven alt-az mounted scope. Definitely a 2-star system but that wafer thin thread of black between them is proving tricky to hold for more than a fraction of a second. Tough double !
  7. Nice report, description and photo Your description is just how I see the "b" star (or "The Pup") with my 12" dobsonian at around 260x. The photo is similar. When I've viewed it in with my undriven scope, the faint "b" star seems to follow Sirius A as it drifts across the field of view.
  8. The handle would be nice. Plus a fake price tag with a couple of zeros left off the price ! Actually though, this is a dream so I'm sure my other half would welcome the new arrival and let me build a large observatory over her greenhouse and veg plots to house it. Dream on, John
  9. These web pages are a sort of "Observers Book of Telescope Aberrations" and can be quite useful for identifying what you are seeing: https://starizona.com/acb/basics/equip_optics101_aberrations.aspx
  10. Nice I used to have the 30mm in that range - lovely eyepiece. Nothing wrong with trying out lots of different eyepieces, especially if they don't cost too much.
  11. Could you order 2 please Mike ?
  12. These short pieces are written by Roland Christen who founded the much admired Astro Physics company in the USA. They concern false colour in refractors, glass types and correction approaches and are worth a read for those interested in such topics: http://www.csun.edu/~rprovin/roland/color.html http://www.csun.edu/~rprovin/roland/ed.html Links to the above were recently posted by Daniel Mounsey on the "Cloudynights" forum but I thought they might be of interest to some folks on SGL as well
  13. I had the Astronomik O-III for a couple of years and it was a great filter. Interestingly, the filter "guru" David Knisely does not rate it that highly due to it's generous band pass width. I liked it a lot just because of that - it was very effective in a wide aperture range of scopes. Maybe there is a degree of personal taste involved in deciding which filter suits best ?
  14. For £80 (+ delivery ?) it's probably a good buy. Looks like you will need to add a dovetail bar (can't see one in the pic) but the carry handle is a nice feature. On an AZ-4 mount it would make a nice, portable scope that was pretty much "grab and go". The only other thing to think about is the finder. The Bressers use a Meade-type finder mount which is not compatible with Skywatcher type finders. You could just forget about an optical finder and stick a Rigel Quikfinder or a Telrad on the scope. That would be enough "finder" for most applications with that scope I'd have thought.
  15. Thats interesting Don. I've seen a very thin ring of colour around the field stop of quite a few wide and ultra wide eyepieces but I've not noticed a wider band of field tinted even with my Nagler 31. To be fair though I don't think I've used it in daylight or on the Moon other than perhaps long ago when I first got the thing