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Thread: New Rig for Astro Imaging

  1. #11
    Join Date: Jan 2013

    Location: Bristol

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    I'm Justin.

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    I don't know much about optics but I know enough to have had an inkling that was the sort of answer I would get.

    I always look at such images with the Fermi Paradox in mind. Where are those little alien critters FFS?

    You have to wonder...

  2. #12
    Join Date: Apr 2017

    Location: Manningtree, Essex

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    I'm Tony.

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    Update to rig:-

    Phase 1 - addition of William Optics Redcat 51

    Reputedly one of the sharpest lenses in the world.
    A four element Petzval apochromatic lens.

    Phase 2 - will be the addition of a cooled, one shot colour (OSC) astronomy camera.

    Phase 3 - will be the addition of a cooled mono astronomy camera.










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  3. #13
    Join Date: Feb 2013

    Location: W Lothian

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    I'm Grant.

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    that looks expensive
    Regards,
    Grant .... ؠ

    I've said it before and I'll say it again: democracy simply-doesn't-work
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  4. #14
    Join Date: Apr 2017

    Location: Manningtree, Essex

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    I'm Tony.

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    Quote Originally Posted by struth View Post
    that looks expensive
    Astro imaging is not as expensive as hifi

    The WO Redcat 51 is £699, which IS considered expensive compared to some of the smaller ED or apochromatic scopes bit it is already a completely flat field lens so doesnít need additional reducers or flat field adaptors in order to use it with any camera.

    The cameras are actually the expensive items. The ones I want start at around £900


    Sent from my iPhone using Tapatalk
    A mainly digital setup with a musical amplifier and endearing 1970's speakers. A CD player that hardly ever gets used and a turntable that is good enough to remind my how enjoyable my old vinyl is. Some cables and things.

  5. #15
    Join Date: Feb 2013

    Location: W Lothian

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    I'm Grant.

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    i see there is a Draconid meteor shower this week...
    Regards,
    Grant .... ؠ

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    OPPO BDP-103D - PANASONIC UB450 - IFI PURIFIER 2/PATHOS CLASSIC REMIX & HIDAC AMPLIFIER - LEAF HD BLUETOOTH - NURAPHONE' HEADPHONES - 2*ZBOOK'- ROON - MULTI HDD'S - DIGIONE RPI3 - EDINGDALE MK1 SPEAKERS - CABLE INC SUPRA, FISUAL, MOGAMI,

    **Iíve studied deeply in the philosophies and religions, but cheerfulness kept breaking through**
    "An old man sleeps with his conscience at night, while young kids sleep with their dreams"

    "Justice is sinking to the bottom of the sea, And it feels like I'm living in the wasteland of the free"
    Give me absolute control
    Over every living soul, I've seen the future, baby,
    It is murder!
    ***SMILE, BE HAPPY***

  6. #16
    Join Date: Apr 2017

    Location: Manningtree, Essex

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    I'm Tony.

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    Quote Originally Posted by struth View Post
    i see there is a Draconid meteor shower this week...
    Pretty limited field of view from my balcony unfortunately


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  7. #17
    Join Date: Jan 2009

    Location: Essex

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    I'm openingabottleofwine.

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    Interesting post Tony. I was aware of the Petzval lens used for portraiture, but I had to look up the difference between 'achromatic' and 'apochromatic' lenses.

    As a photographer (strictly analogue) I was aware of the work of Voigtlander and of Steinheil and of the subsequent manufacturers bearing their names (and who's lenses I use, along with those by Zeiss), but didn't know the Petzval lens was used in astrophotograpy.

    Since all of the objects are 'at infinity', you are not interested in depth of field - is this what you mean by "flat field", and why would you need an adapter?
    Barry

  8. #18
    Join Date: Apr 2017

    Location: Manningtree, Essex

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    I'm Tony.

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    Quote Originally Posted by Barry View Post
    Interesting post Tony. I was aware of the Petzval lens used for portraiture, but I had to look up the difference between 'achromatic' and 'apochromatic' lenses.

    As a photographer (strictly analogue) I was aware of the work of Voigtlander and of Steinheil and of the subsequent manufacturers bearing their names (and who's lenses I use, along with those by Zeiss), but didn't know the Petzval lens was used in astrophotograpy.

    Since all of the objects are 'at infinity', you are not interested in depth of field - is this what you mean by "flat field", and why would you need an adapter?
    Hi Barry!

    There are two uses of Ďflatí in Astroimaging really.

    One relates to vignetting and distortion at the edges in the optical field that require correction via a field-flattener lens.

    Thatís what Iím referring to as far as the Redcat is concerned. It doesnít need any correction to fill a full-field camera without vignetting or distortion.

    The other use of Ďflatí is when imaging. You calibrate the image by using darks, bias and flats.

    The darks are subtracted to remove any hot pixels.
    The bias is to remove any inherent faults in the CMOS/CCD chip used by the camera.
    The flats is to produce an even illumination over the field, to remove any vignetting and also any Ďdust bunniesí.

    Tony


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  9. #19
    Join Date: Jun 2014

    Location: Chorley Lancs

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    I'm Steve.

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    Hi Tony, time is 6.50 am, and looking southwest(ish) there is the crescent moon, and to the right and up a bit, at about 45 degrees to the moon there is one really bright star - what is it? Mrs. P has been wondering for some time, as have I
    I just dropped in, to see what condition my condition was in

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  10. #20
    Join Date: Dec 2008

    Location: East Riding of Yorkshire

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    I'm Shaun.

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    I bought a Samyang 14mm f2.8 lens back in 2017 to use for my coastal photography but sold it a few months back to concentrate on my Nikon 20mm. I also bought at that same time a Samyang 85mm f1.4. That lens is quite simply stunning.

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