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NGC 1502

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NGC 1502 last won the day on October 25 2013

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About NGC 1502

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    Essex U.K.
  1. NGC 1502

    orion optics mirror cell holder

    Not done that exact job. However I have adapted mirror cells to use in a telescope different to the one originally intended, and made cells from aluminium and also plywood. The cell to tube attachment may have to be ground down or spacers added accordingly to make it fit. If you’re a bit of a DIY sort of person it’s not difficult at all. You need to ensure that your mirror will fit the cell. Mirrors can vary in exact diameter from the nominal size, and thickness can vary too. Most primary cells can be adjusted for a good fit, or spacers added. Mirrors must not be tightly held or the precise optical figure may be distorted. On the other hand only tiny clearances are needed, if there’s too much slop, the mirror can shift with loss of collimation. Collimation springs should be strong, this helps to hold collimation adjustments. HTH, Ed.
  2. NGC 1502

    Dew on my mirror !

    Ok Brian, sorry didn’t realise you’d visited us. The member with those pinhole cameras can make or fix absolutely ANYTHING. If he’d been there I’m convinced the Titanic would not have sank. 300 foot gash ? No problem....... Maybe see you soon, Ed.
  3. NGC 1502

    Dew on my mirror !

    Hello Brian, sounds like a nice long session You’re obviously very keen. You are probably aware of your local astronomy club - Castle Point AC. You would be most welcome at any of our events, tea / coffee & biscuits always available. On Saturday March 16th we have a public open night. On Saturday 27th April we have a joint event with the BAA and all details are on CPAC’s website. Although I’m visual only, we have lots of imagers, some expert, others on that learning curve........ Also we now have two dark sites on the Essex coast. Perhaps see you sometime, if not all the best for future sessions and hoping you sort that dew problem. Ed.
  4. Some good advice already given. I’d like to add my own thoughts about observing double and multiple stars. The whole sky is stuffed with doubles of many types. Some are colour contrast doubles, some easier or more difficult to split (getting a “split” is resolving the stars into their individual components). Doubles can be well observed under light polluted skies or as already said with a bright moon around, even in summer when it never gets fully dark. Some doubles are line of sight, that is they just happen to be in almost the same location on the sky but at a very different distance - these are called optical doubles. A lot of science can be learned when studying the subject of double stars. Fully recommended , Ed.
  5. NGC 1502

    Replacement focuser

    Good advice from Demonperformer. I’ve had several scopes with focusers that were not great. However, with a bit of work many iffy focusers can be made ok. Possibilities - has the focuser adjustment screws where the focus shaft attaches ? Adjusting those might help. Can the focusing tube be made to wobble relative to the focus body ? Adding teflon tape, or possibly ordinary electricians tape to the focus tube may help to reduce or remove the wobble. Doing this can take several tries to make it work. Try narrow strips of tape along the focus tube and opposite the adjustment screws. If the wobble has gone but the movement is now too stiff, you’ve either added too much tape or put it in the wrong place. Try again. You may have to accept reducing the wobble rather than removing it. Sometimes best to quit while you’re ahead. If you made it better, then you’re ahead If you’ve no tape, try Poundland or similar. Dismantling the focuser and cleaning out the old sticky grease and relubing may help. Only tiny amounts of grease is needed. Don’t use oil it’s too runny. Good luck, Ed.
  6. Hi and welcome to SGL lots of folks on here happy to help. Just checked out the Telescope House website, this scope is shown as in stock. Looks the same as the pics shown earlier. If I were looking for 10” Dobsonian, the Bresser would be a strong contender. I like the fact that the tube is mounted in tube rings, this allows rotation to bring the focuser into a position to suit the user, and fore and aft movement for balance. The large altitude bearings are much better than from other manufacturers. I’d rather have a Telrad finder than a small optical unit, but that’s an easy upgrade later on. A scope like this really needs better eyepieces to get the most out of the scope, but that applies to similar scopes from other makers. Of course there’s always the second hand market, but it’s often difficult to find what you’re looking for without a long journey to collect. A new scope means you get your requirements delivered to your door. A 10” Dob could very easily be a lifetime scope with no need to ever upgrade. All the best in your choice, Ed.
  7. This could be a useless comment because I’m not at all familiar with what you’re constructing. But instead of gluing, could you use removable screws instead, enabling easy dismantling for modifications ? Or is there some reason that you must use glue ? Ed.
  8. Hi everyone. Advanced notice of an event jointly organised by the British Astronomical Association and Castle Point Astronomy Club on Saturday 27th April 2019 at Rayleigh in Essex. The theme of the event is “galaxies” and various talks will take place. CPAC are celebrating their 50th anniversary and will be having a display of the club’s work. A few trade stands will be present. There’s on site parking and nearby is Rayleigh station on the Liverpool Street to Southend on Sea line. Booking has now opened, full details are here www.britastro.org/rayleigh2019 Sould be a great day out so maybe see you there, Ed.
  9. NGC 1502

    Sirius B and E/F stars - what does it take!?

    Different scopes show different orientation in what is seen at the eyepiece. Standard Newtonians have an inverted south is up view with east to the right. Refractors, SCTs, Maksutovs - when using a standard 90 degree diagonal they flip the view east / west so north is up, east is to the right. It can get somewhat confusing....... However the confusion can be resolved by keeping in mind which way is up in the scope you’re using, then if your scope has a drive, turn it off. Whatever scope you’re using stars will exit the field of view on the west side and new stars will enter on the east side. Sorted Ed
  10. NGC 1502

    Monocular

    Hi and welcome to SGL lots of folk here happy to help. If you could give some details of your monocular that would help. The basc specifications are the magnification and the size (diameter) of the front lens. You say the monocular is 40-60. Could that be 40 magnification with a 60mm diameter front lens ? That’s way too high to hand hold. 60mm front lens would be very useful. So as already mentioned, it would help if you could explain. Almost any monocular would collect far more light than the unaided eye and would therefore reveal many more stars and faint objects like the Andromeda galaxy M31. Star clusters like the Pleiades would be well seen. Looking forward to hearing details about your monocular so folk on here can help. Ed.
  11. NGC 1502

    Sirius B and E/F stars - what does it take!?

    Perhaps I should clarify what my 6” Dob exactly is. It was self built in 1994 using a premium David Hinds mirror set. The scope gives razor sharp views llmited only by atmospheric conditions. It’s kept precisely collimated and allowed to cool to ambient before use. The mirrors were recoated 2 years ago. It’s probably about as good as a 6” Newtonian can be. But it takes a night of excellent seeing to reveal the E&F in the trapezium, and Orion needs to be close to the Meridian. Ed.
  12. NGC 1502

    Sirius B and E/F stars - what does it take!?

    On a good night my 6” Dob will reveal the E&F stars in addition to the easier 4 trapezium stars at 100x or more. If the seeing is poor they won’t be seen. In my 10” Dob E&F are much easier at similar magnifications. Sirius B is far tougher. It took me years of trying with my 10” Dob before finally being successful on a night of excellent seeing. Ed.
  13. NGC 1502

    XT4.5 or XT6?

    Oops, didn’t notice what an old thread this is......
  14. NGC 1502

    XT4.5 or XT6?

    Although I don’t do imaging, at my local club most seem to try basic lunar photography to start with. The moon is big bright and easy to point your scope at, bright means exposures can be short so fewer problems. Take some advice, do your best and shoot away and see what you get. It’s a learning curve but your failures will lead to better images. Good luck, Ed.
  15. NGC 1502

    Chain of stars name

    Excuse me ? I AM NGC 1502 Please do not “view” me at any power. I very strongly object to being looked at for any length of time. GOT IT ? Ok then. As long as you understand, I’m prepared to overlook this.
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