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Ambermile

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Posts posted by Ambermile

  1. *** DO NOT TRY THIS AT HOME FOLKS (NO, REALLY - THE SUN IS DANGEROUS) ***

    Right, that's the important bit out of the way. There are a few people around the world that I have made adapters for to allow them to remove the objective/tube assembly from their PST's and fit the diagonal/etalon assembly into 2" focusers. With the addition of an Energy Rejection Filter at the pointy end of their scopes (usually 80mm refractors) they then have a 3" solar scope. Whilst technically it's not that simple (there is some hacking of the OTA amongst other things) the benefits of this are manifest in the vastly increased resolution and brighter images at high focal lengths that 80mm of glass can give over the PST's 40mm.

    Anyway. Damian Peach does a bit of solar work now and then and has recently upgraded from a 130mm Energy Rejection Filter to a larger one to use on his 6" APO - meaning he had a 130mm filter excess to needs. To cut a long story short I bought it from him and it arrived today. It now sits on the end of the Meade AR6 refractor waiting for the fog to go away so I can see the sun! I also, in the meantime, borrowed a tuneable Lumicon Ha/prominence filter (0.7 angstrom) from the Norwich Astro Society in readiness for this mod to try both it and the PST etalon alongside each other.

    I may take some piccies of the scope later but I am rather excited... this amounts to getting a 6" Ha Solar scope for less than £1000 all in :) Needless to say I will be imaging through it first chance I get... 'cos I also have one of Astronomisers SC1.5 cams sitting here in readiness!

    Arthur

  2. RAW files are just that, raw data. To convert from this raw data to jpg/bmp/whatever, the camera firmware applies a smoothing/blurring algorythm as well as some stretching. It is this processing that you have to replicate later yourself. The thing with RAWs is that you get only the data, nothing that has been messed about before you get the chance too.

    To be honest, if you can't get stars in a RAW file that would be there in the camera-processed jpg then it's your processing skills that need brushing up and there are many places in this site and the broader internet to help/guide you there.

    Arthur

  3. Well, I use mainly 2" for a couple of reasons really. First, with the big scope they are pretty much a pre-requisite otherwise it's just not being used to it's maximum. Secondly though, have you ever seen how silly a Meade S4000 26mm looks 8 feet up a truss tube? You need bins to even see it :)

    Arthur

    PS - incidentally I have somehow acquired a few more 1.25" ep's that I won't be needing so expect a clearout again soon! Postage cost only as usual. On your marks...

  4. Very nice Phil, a great solution. Will it run webcam LE I wonder in place of the parallel port?

    ... but the lead is only 4 metres and won't reach indoors in my new house.

    Ant

    :lol: you mean you didn't check before moving?? :)

  5. OK - here we go then.

    ART-285:

    Case - £100

    Populated board set - £140

    Various bits and pieces - £100

    ICX285AL - £350

    Packing/etc. - £20

    Total - £710

    Let's not consider the 18 months development work, by four people, or the fact that they all want some recompense for that. Nor the fact that there is support for badly-assembled kits that averaged about £70 per camera.

    The ART-285 went out for £795 plus VAT.

    The ART11002 will be sold through dealers - who expect to make a profit and will also have to provide support. The ccd alone comes in at around £1250 :)

    Do the sums...

    Arthur

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