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GerhardB

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Posts posted by GerhardB

  1. NGC6888

    in Deepsky

    Posted

    Antonio, Lukus , Thank you very much for the nice comments.

     

    @Antonio: Though you have a few 'hot spots' in Spain, in many parts of your country light pollution is much less dramatic than in most parts of Europe. Luckily you found yourself a dark spot - according to the light pollution map very similar to Nerpio, though later is at a higher elevation (1800).

     

    @Lukas: Since MLPT cannot be automatized in the current version of Sequence, I have to rely on an autoguider, Waiting eagerly for the new release ...

     

    Best regards,

    Gerhard

  3. NGC6888

    in Deepsky

    Posted

    Hi,

    This image was captured with the ASA 20" Cassegrain near Nerpio/Spain, one of the darkest locations in Europe. The long focal length (4400mm) and the quite reasonable seeing of 1.3" nicely resolved the fine filaments of this nebula.

     

     

    medium.jpg

     

     

    Large and larger.

     

    Best regards,
    Gerhard

  4. M20

    in Deepsky

    Posted

    Thank you, Matts.

     

    The signal-to-noise ratio you get under these skies is just amazing. The fast scope helps too, of course ;)

     

    Best regards,

    Gerhard

  5. M20

    in Deepsky

    Posted

    Hi,

     

    I spent one week around new moon in Namiba, where I experience perfect conditions for six nights.

     

    The first object (of a few more to come) is famous M20. Because of its high position near the Zenith it shows a lot more of the blue reflection nebula than at our lattitudes in central Europe.

     

    medium.jpg

     

    Medium size

     

    Large size.

     

    Best regards,

    Gerhard

     

     

  6. parking mount with CCD-commander

    in ASA DDM85, 100, 200, 500

    Posted

    Hi Erik,

     

    I use the same configuration as you (except The Sky) and have no problems using the park command in CCDCommander. The SW through ASCOM can only use the coordinates saved in Position 1. There can be a 180deg. confusion in Az. between softwares, I would suggest that you move your telescope manually with the slew buttons in Autoslew to the desired position and then save it as your park position 1. Worked for me. 

     

    Best regards,

    Gerhard

  8. Need help with settings in Maxim DL

    in Software

    Posted

    Hi Michael,

     

    As soon as Maxim DL knows the focal length of the telescope and the the pixel size of your camera it will be able to calculate the pixel resolution of your system. When Maxim DL has been setup properly with this information, it will write it into the header of the fit-file every time you make an image. It is also essential that Maxim is connected to your telescope to be able to write the center coordinates of the image into the fit header.

    The only step left for you is making a Pinpoint run with your first image and do a calibration ( under the telescope tab of the observatory window). After that centering a star should work. For the rest of the other images you only have to repeat the Pinpoint step, without calibration.

     

    Best regards,

    Gerhard

  11. Repeatability of OK3Z focuser.

    in ASA Focuser

    Posted

    Hi Matts,

     

    Unfortunately the performance of FocusMax is seeing dependent, and the writers of CCDAP suggest to estimate the focus offsets on a night of good seeing.

    Theses nights are extremely rare at my location, so I made a series like you did, calculated the mean values and used them as a starting point for finetuning by visual inspection.

    The CFZ is not as critical as one would think because of above mentioned seeing effects and shifted with my average seeing of 2.5" - 3.5" to a  value of ~20microns.

     

    As a side note, Phillip Keller's new ( and hopefully soon to come) version of Sequence should contain its own autofocus routine which compensates for the degrading effects of seeing.

     

    Best regards,

    Gerhard

  12. M13

    in Deepsky

    Posted

    Hi Dave,

     

    Thank you for your nice comments. The details of the exposures are listed on my website. My approach was to comine long and short exposeres to get a deep image on the one side and a fully resolved and not overexposed core on the other side.

     

    Best regards,

    Gerhard

  14. Different Back Focus Numbers (ASA 10"N Wynn 3")

    in ASA Correctors & Accessories

    Posted

    Hi Bill,

     

    The focal shift Delta can be computed with this formula:

    Delta = (1 - tan alpha'/tan alpha) * D,

    D = thickness of filter
    alpha = angle of incoming light from vertical direction
    alpha' = angle after refraction in glass

    For small angles ( like in our case) you can make the simplification:

    tan alpha' ~ sin alpha'
    tan alpha ~ sin alpha

    Snellius refraction law:

    sin alpha'/sin alpha = 1/r

    which leads us to

    Delta ~ (1 - 1/r) * D

    For r = 1.5 we get Delta/D = 0.333

     

    Best regards,

    Gerhard

  15. New Sequence ?

    in Software

    Posted · Edited by GerhardB

    I saw a screenshot ( http://www.astrooptik.com/asa/Chart32Screenshot.jpg) of the new (beta) version in a german astro-forum and according to Philipp's description it will allow automatization of the whole image capturing process, including MLPT. It even has its own autofocus routine which is supposed to work better than FocusMax.

     

    Looking forward to get my hands on it ...

     

    Best regards,

    Gerhard

  17. NGC7023 Iris Nebula - 15hrs

    in Deepsky

    Posted

    Hi Jeffrey,

     

    This is an amazing achivement under this amount of light pollution, the nebula is quite prominent in your image.

    Post processing is very good, though there is still some noise visible in the full resolution version. Pixinsight offers several noise reduction methods, which - with the right choise of parameter settings - work very well and unobstrusive.

     

    Best regards,

    Gerhard

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