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minimum size to see surface details on Mars.

Discussion in 'Observing Celestial Objects' started by kevan hubbard, Jun 5, 2018.

minimum size to see surface details on Mars.

Started by kevan hubbard on Jun 5, 2018 at 12:25 PM

51 Replies 6649 Views 1 Likes

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  1. Dave In Vermont

    Dave In Vermont Well-Known Member

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    Love a good hot-curried dish. Got turned onto them in London in 1970. A small Pakistani restaurant called the Noor Jahaan <sic>.

    I was hooked for keeps! Never tried a pickled onion - yet! :p
     
    Last edited: Jun 7, 2018
  2. kevan hubbard

    kevan hubbard Well-Known Member

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    I reckon I've bashed the most northern Indian eatery,using the term in the pre partition sense,in the world in Reykjavik, Iceland. Most southern I've done is Wellington, New Zealand but I speculate that there must be ones further south in Dunedin and Invercargill. Possibly in port Stanley as the English military there probably enjoy their curry.I suspect however Antarctica must be free of Indian restaurants?interestingly most Indian restaurants are run by Bangladeshi folk.
     
  3. Don Alvarez

    Don Alvarez Member

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    Is the Baader M&S only regarded as a planetary filter? How does in compare in function to say, an Orion Skyglow?
     
  4. Gabby76

    Gabby76 Well-Known Member

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    The M&S works well on planetary contrast and I find the Orion works well for emission nebula.
     
  5. Mak the Night

    Mak the Night Well-Known Member

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    The Baader Neodymium is a bit sui generis in that it acts a lot like a simple 'light pollution' contrast filter in many ways. It is quite subtle. It's also referred to as the Swiss Army Knife of filters as it is so adaptable. I never go out without it to be honest (whether I use it or not). For deep sky, low magnification it can help with general skyglow, especially if the transparency isn't good. It can be very good on planets, Mars particularly in my experience. I never thought it did a great deal on Saturn myself.

    The Orion SkyGlow is quite different, it is more similar to the Baader UHC-S and has a near identical light transmission curve. The Orion is more aggressive than the Baader UHC-S and seems a darker green which can give slightly more contrast with emission nebulae in my experience. Although this can be at the expense of some fine detail.
     
  6. Don Alvarez

    Don Alvarez Member

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    So I take it the Orion has little value on planetary targets.

    Sorry to hijack thread, bad habit of mine
     
  7. Mak the Night

    Mak the Night Well-Known Member

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    Yeah, I wouldn't recommend it for planetary.

    There's a thread topic? Lol!
     
  8. Dave In Vermont

    Dave In Vermont Well-Known Member

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    Don - you're welcome to steer threads here. No mean, ol' fascist moderator(s) here. We embrace peoples' grabbing the reigns as it simply indicates something lit-off a spark to bring something to mind - e.g. the Baader Neodymium Moon & Skyglow Filter and how/what to employ it on.

    As Mak often states - he considers Baader M & S the "Swiss-Army Knife of filters. It works for so many things." I'd agree - it's useable in so many ways on so many objects out there. As to it's comparison with the Orion SkyGlow - both are very good. That's why I have both. But if you were on a desert-island and could only have one filter? I'd choose the Baader Neodymium M & S Filter. Hand's down. Oh - and to get a bit tech. - they're both classified as being 'broadband' filters.

    My usual mantra is: 'Experiment! Experiment! Experiment!' Reggie here - orion25 - did just that, and found a cheap & easy way to get the clouds on Venus to reveal details. And his finding will end-up being published in astronomical-journals world-wide. Maybe not tomorrow - but it will. And all he did was try something he hadn't heard of being done before!

    So try the Baader M & S on anything that comes to your mind! Just please keep us all informed?

    Thanks!

    Dave - Resident 'Filter-Nut' (one of them now :p)
     
  9. Mak the Night

    Mak the Night Well-Known Member

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    I wouldn't necessarily describe the Baader Neodymium as a 'broadband', even if it essentially can be classified as one. A broadband filter is generally a diffraction filter of sorts.

    IMG_20180516_122120.jpg

    The Baader Neodymium is more akin to what was once termed a 'Moon & Skyglow' filter or possibly similar to a light pollution filter.

    IMG_20151111_171116.jpg

    I honestly find that it can act very similar to an #82A Light Blue Wratten filter.

    IMG_20171203_130209.jpg

    Very different from the Orion SkyGlow and Baader UHC-S (above), which are more traditional 'broadband' filters.
     
    Dave In Vermont likes this.
  10. Dave In Vermont

    Dave In Vermont Well-Known Member

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    Try this: Anything which is NOT a 'Narrow-Band' filter, is a 'Broad-Band' filter or a 'Color-Filter.'

    Then you can chisel' away to your hearts' content, Michelangelo!


    Lookie at what I found at Ol' Man Billy-Bob's Yard-Sail:



    [​IMG]

    He said it made a fine barndoor-stop. Think it was worth $2?
     
    Last edited: Jun 7, 2018
  11. Mak the Night

    Mak the Night Well-Known Member

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    Yeah, but Renaissance filters weren't really that good.
     
  12. Dave In Vermont

    Dave In Vermont Well-Known Member

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    I think Lumicon made your new, high-priced #8 Yellow by simply adding 1/2 the usual amount of Sherwin-Williams Yellow Latex House-Paint to their substrate.This is why it's a lighter shade of Yellow #8.

    And this to save them money while profiting-up-a-storm..... :p :cool:
     
  13. Mak the Night

    Mak the Night Well-Known Member

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    Probably. I have to wait weeks for these. I think they're building them to order. At this rate it will take me years to complete the set.
     
  14. jgroub

    jgroub Well-Known Member

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    "Yes I was thinking about things like the polar caps not things like olympus mons in fact can any earth based ground telescope pick out olympus mons?the only pictures of olympus mons I've seen have been taken from Martian orbit."

    Yes, Kevin, I've seen some pics from Damien Peach and those great earth-bound planetary observers where you could see Olympus Mons and the other three little Olympians off to the side. It's pretty astounding!
     
  15. jgroub

    jgroub Well-Known Member

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    As Alfalfa used to say before all of us were born, "And how!" I left another "astronomy forum" [cough, cough] precisely for that reason. I presented my negative opinion of Bird-Jones scopes, and a specific one in particular, the Meade DS-2130, WHICH I ACTUALLY OWNED. The moderator warned me that if I ever did that again, he'd kick me out. I left before the fascist could do so.

    Wait, what? I SAY THAT!!!! I say it all the time!

    <iframe width="560" height="315" src="" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
     
  16. Dave In Vermont

    Dave In Vermont Well-Known Member

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    Let me guess which forum it was you were threatened by the moderator, Jon? Was it AstronomyForums? Or SGL? Or CN (RowdyFights)? Or..... :p :eek:

    I was one of the first to start training 'Moderators' back in the early days of internet-forums. The initial-screening would weed-out the dopes' who wanted to be a 'mod' for "Power Over Lowly Members!" Out the back-door and into the dumpster they went! I emphasized a moderator is, first & foremost, a DIPLOMAT. His/her job is to assist members' with question, ideas, technical-problems, etc. If they pllayed the 'Heavy' and acted like a bully? "Have a nice trip to the dumpster, Pinhead!" :p

    I wound-up running an international-forum with 2.2 million members based in the Netherlands. Many of our members' were ministers of government from all over the world. We were like the United Nations. The difference between us and the UN was that our version worked!
     
  17. Mak the Night

    Mak the Night Well-Known Member

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    I knew I'd heard it somewhere lol.



    Unless it was on Echo Beach ...

    Edit:

    m.jpg

    http://neptunephoto.com/spec_sheet.html?catalog[product_guids][0]=362936

    If this is the Meade scope you were *slagging off, you're not on your own from what I've read. It seems a tad controversial. There were some issues reported by many people. I think the scope has been discontinued now.


    *British slang = heavily criticise
     
    Last edited: Jun 9, 2018
  18. Dave In Vermont

    Dave In Vermont Well-Known Member

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    Echo Beach - One of my all-time faves!
     
  19. Mak the Night

    Mak the Night Well-Known Member

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    How about Echo & the Bunnymen?

     
  20. Dave In Vermont

    Dave In Vermont Well-Known Member

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    That's a goodie, too!



    This is where I came into radio - this whole genre!


     

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