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AlentejoSkies

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Everything posted by AlentejoSkies

  1. Looking for a flexifocus for my ETX-105. Thanks, Douglas
  2. AlentejoSkies

    COMPLETED - Wanted: Flexifocus for ETX

    So, to follow up: This thread can be closed. I did the job - dead-easy, thanks John - but immediately realised that the focus rod is stiff. I'd never noticed before, but now it was obvious. Torsion would build up in the cable until it was enough to overcome stiction and then suddenly it would make a half-rotation in one jump. Gear cable wasn't even strong enough not to uncoil in the one direction. The brake cable fared better, but I think flexifocusing is out of the question until the focus itself is smoother. I'll see about stripping down and regreasing sometime soon. Looks like the back of the OTA will unscrew once it's deforked. But that's getting a bit off-topic for the classifieds.
  3. AlentejoSkies

    COMPLETED - Wanted: Flexifocus for ETX

    Thank you John, that helps a lot. I was wondering if brake or gear cable would do the job. I'll get the cable cutters out tomorrow.
  4. Down here in the southern Alentejo, Portugal at more or less 37 degrees compared to southern UK 51 degrees North, Sirius is way up high right now, and sparkling like crazy anyway. I love the interaction with the atmosphere, with or without a telescope, but most of all through a telescope way off focus, like a plasma ball, so beautiful!
  5. AlentejoSkies

    Meade ETX-105 and extras

    I can't stand the suspense! How come it's still for sale? I just want to look after this lovely little scope but I'm not so often in London. I'll send you a PM in a bit with some ideas how I could get hold of it. At least then I can rest easy one way or another...
  6. Hi Stu, Just what I need. PM on the way.
  7. Hi, Looking for a vixen (or other) 36.4mm to 1.25 inch adaptor please - to fit to a Prinz 660 drawtube. Thanks, Douglas
  8. AlentejoSkies

    GP-DX polar axis illuminator repair

    Hi, Does anyone know where I can find a suitable potentiometer to replace the brightness control on a GP-DX polar axis illuminator? It's an 850k ohm pot according to the text printed on it - I guess logarithmic - but it needs to be the same size as the original to fit on the PCB and I just can't find one... If someone can tell me what this style is called it should be easy, but they come in a bewildering range of sizes and forms! It needs replacing as a previous owner of the mount left a leaky set of batteries in it for too long. Thanks in advance
  9. AlentejoSkies

    GP-DX polar axis illuminator repair

    So, if anyone one day needs to know... I'm pretty sure it's actually a B50K 12mm radio potentiometer. About a dollar including post from Aliexpress. Will only know for sure if it fits when it arrives by China Post in a month or so.
  10. AlentejoSkies

    Hello from Portugal

    Hey welcome Eduardo! I'm also in Portugal - near Odemira, Alentejo. Not into astrophotography though, purely visual. So far I didn't find many amateur astronomers around here. Might help if I spoke a bit better Portuguese! Anyway, welcome to the forum.
  11. Yes, posting to UK. PM sent. Thanks!
  12. Only have a 15mm. And I'm keeping it! But 40 pounds sounds quite fine. Will pm you tomorrow morning for payment details if that's okay?
  13. Hi Moonshane, I'm interested but I don't see a price...
  14. AlentejoSkies

    *SOLD* Televue 15mm Plossl

    PM'd you. I'd like this eyepiece please. Douglas
  15. Actually it was a great night. Once I stopped messing around with the telescope and started looking at the moon. Trying a new addition to the stable - a C8 with carbon tube, on long-term loan. I really want to get to like this instrument, but it's a steep learning curve from my dob. Anyway, it works great with my WO binoviewers, having such long focus range, so I could use the supplied 20mm eyepieces and no barlow last night, giving a view which seems to be a hot air balloon ride over the surface of the moon. Stunning! 3D. I'm again amazed at what goes on in the brain when two eyes are involved. Like I had never seen the moon before. I spent the evening there, switched off the motor drive and let the moon drift through the field, again and again. It's a natural landscape, nature not as we know it, but also similar. Savannah-like. Unforgettable. I could have got the same effect more easily with the little dob and barlowed the binoviewer, but that's not the point... last night was great just as it was.
  16. AlentejoSkies

    Bob's Knobs for C8

    Looking for Bob's Knobs for a C8 (standard 6/32 for Fastar compatible C8 with silver phillips factory screws) 29 dollars seems a bit much for 3 screws, and so does 23 pounds. On the other hands, they would make life so much easier... Anyone have an spare set hanging around, before I checkout?
  17. AlentejoSkies

    Telrad and RACI

    Looking for a Telrad and/or 9x50 RACI finder for my C8.
  18. AlentejoSkies

    new SCT

    So just as I thought I had the basics sorted out after over a year with two dobs a couple of times a week... I have a C8 on loan from a friend, and I am back to the beginning with some basic questions: Image shift - how much is 'normal' ? I estimated last night that the image shifts a few percent of the field when I change focus direction. Is that just the way it is when you move the primary to focus and I need to get used to it? It's a bit disconcerting but more of a distraction than a real problem. Field curvature - I'm only going to use this instrument for visual, but even so, center to edge sharpness needs what seems to me like a lot of refocus. Would the f/6.3 reducer/flattener be a good item to put on my wish-list? Vibration sensitivity - there is a certain springiness in the OTA/dovetail itself. Guess that is not going to change. It's just that I never even had the issue before. By the time I had carried the mount, field tripod, power supply and OTA around, let the whole thing cool for an hour, I was missing my 6 inch 'grab and go' dob... I do have to say though, it was also a great night once I started looking at the moon rather than the telescope...
  19. AlentejoSkies

    new SCT

    My very rough estimate is 2 or 3 arcminutes
  20. AlentejoSkies

    SkyWatcher Infinity 76P

    I bought this scope for my four year old daughter. She loves it. I don't... Pros: You can put stickers on it. You can see the moon quite well. Cheap, portable, no cooling, attractive shape. Light plastic eyepiece bounces when dropped. Cons: Children knock it out of position every time they touch it. No real focuser. The supplied eyepiece has curved slots for simple helical focus, perfectly adequate. And you can push the helical focus plastic pins out and so theoretically any 1.25 inch eyepiece will fit in the tube, maybe with an extension, but practically I have never found a good combination. I think the supplied x30 erecting eyepiece is probably the best for the job. Tube is curved so fitting a red dot finder is a bit tricky - and I did need to fit a finder. 76mm f/4 reflector, 300mm focal length, I can't think of anything its really useful for. The moon is so bright you would ideally need a filter, which doesn't fit on the eyepiece. It's given us and friends a lot of fun. The sight of 4 little ones standing on a table, heads down looking at/through a little blue spaceship/penguin is one I will never forget. But for actually looking through, and something that would grow with the child, I'd probably choose the 130P if I did it again.
  21. AlentejoSkies

    new SCT

    So, for completion, now I got back home and tried @beka's grease redistribution tip, as the scope is quite new. Ran the focuser through its complete range and back 5 times. Image shift when changing focus direction is unchanged. I still don't know how much shift is 'normal' but finishing with a ccw turn is indeed becoming second nature as it seems it should when using an SCT, so that's that for now.
  22. I saw this once too and it was a stunning effect. I often look for it but so far it's only that one time - out there in Thailand that night I almost got married... The same perspective effect is often visible, but nowhere near as amazing, on aircraft contrails if several aircraft are flying from one horizon to the other.
  23. AlentejoSkies

    Hi! :)

    Hi Baer, and welcome to SGL. I highly recommend putting Sky Safari 5 on your smartphone if you like that sort of thing. You can easily check what's going to be where when, and gather a lot of good background information on thousands of objects.
  24. AlentejoSkies

    What got you started?

    Always interested, but I bought my first scope at the age of 43, for my 4 year old daughter. It's a 76mm f/4, good for looking at the moon. She loved putting stickers on it, and I found out that it was much more difficult than I expected to find anything of interest just by looking. A year and a half later, thanks in no small part to this forum, and also to a lot of looking up as well as reading, I'm the local astronomer. That's a great position to have, because all the interesting questions come my way, and by the time I have researched good answers I know a lot more than I would have ever expected.
  25. AlentejoSkies

    new SCT

    So many great suggestions - which from my side will have to wait a couple of weeks until I get back from the summer holidays... Two weeks without any optics... has its advantages and disadvantages. And then I will go for the grease redistribution idea first and put the result here for posterity. Any modifications will be only once I have a feel for the instrument as it is. It is still such an unknown to me compared to my other equipment. It's so new I am still getting to grips with collimation. I'd better stop now, I'm starting to miss it... Thanks for all the answers and support. Douglas
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