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AlentejoSkies

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Posts posted by AlentejoSkies


  1. 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.

    • Like 1

  2. 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

     

    side view.JPG

    back side.JPG

    front side.JPG


  3. 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.

    • Like 1

  4. 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?


  5. 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.

    • Like 2

  6. 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.


  7. 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.


  8. 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.

    • Like 2

  9. 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

    • Like 1

  10. Sounds like there is a fair variation between instruments in any case. I haven't got a feel for this one yet but I guess that will come with practice. This was the first time I had it out on my own.

    From now on, I will be finishing with a CCW focus adjustment. Thanks for the tip.


  11. 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.

    • Like 6
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