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Thread: New Rig for Astro Imaging

  1. #11
    Join Date: Jan 2013

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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

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    I'm Grant.

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    that looks expensive
    Regards,
    Grant .... ؠ ......Don't be such a big girl's blouse

    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 doesn’t 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


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  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 ......Don't be such a big girl's blouse

    I've said it before and I'll say it again: democracy simply-doesn't-work
    .... ..... ...... ...... ................... ..... ..... ..... ..... .....
    FIIO K7 BT, M11 PLUS, BTR7, KA5 - OPPO BDP-103D - PANASONIC UB450 - PANASONIC 4K ULTRA HD TV - PIXEL 6 - AVANTREE LR BLUETOOTH - 2* X600 SOUNDCORE - HEADPHONES INCLUDE, FIIO, NURAPHONES', FOCAL, OPPO, BOSE, CAMBRIDGE, BOWER & WILKINS, DEVIALET, MARSHALL, SONY, MITCHELL & JOHNSTON - 2*ZBOOK'S- MERCURY BD ROM, ROON, QOBUZ, TIDAL, PLEX, CYBERLINK, JRIVER - MULTI HDD'S -

    Oh my god! There's nothing wrong with the bidet is there?

    “Nothing discloses real character like the use of power. It is easy for the weak to be gentle. Most people can bear adversity. But if you wish to know what a man really is, give him power. This is the supreme test. It is the glory of Lincoln that, having almost absolute power, he never abused it, except on the side of mercy".

    “You see these dictators on their pedestals, surrounded by the bayonets of their soldiers and the truncheons of their police ... yet in their hearts there is unspoken fear. They are afraid of words and thoughts: words spoken abroad, thoughts stirring at home -- all the more powerful because forbidden -- terrify them. A little mouse of thought appears in the room, and even the mightiest potentates are thrown into panic.”

    "You don't have free will. You have the appearance of free will.”

    “There's a war out there, old friend. A world war. And it's not about who's got the most bullets. It's about who controls the information. What we see and hear, how we work, what we think... it's all about the information!”


    ***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 ‘flat’ in Astroimaging really.

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

    That’s what I’m referring to as far as the Redcat is concerned. It doesn’t need any correction to fill a full-field camera without vignetting or distortion.

    The other use of ‘flat’ 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 ‘dust bunnies’.

    Tony


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  9. #19
    Join Date: Jun 2014

    Location: Chorley Lancs

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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

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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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