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  1. #1
    afigueroa's Avatar
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    Default what i am going to win and goint loose with this 120 aco



    Orion SkyView Pro 120 GoTo Achromatic Refractor (120mm, 1000 m, f8.4)

    My concern is with this Refractor what i am going to loose or win agains a reflector 203 mm , 1000 m and f4.9 in planetary observation and deepspace objects?


    I live in area with a lot of light pollution.

    regards
    Antonio
    120mm Orion Refractor Achromatic f/8.3, Explore Scientific Levy Comet Hunter 152mm f4.9, William Optics Megrez 90 APO, Sky View Pro Mount and Orion Atlas Mount
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  2. #2
    Bob327's Avatar
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    Default

    Both OTA are pretty big... but size wise The refractor is somewhat smaller

    The Refractor does not need cool down time to function well
    The Refractor almost never needs to be collimated..some like my 127 mm refractor do not even have collimatign screws)
    Refractor is slower so you will not have as wide a fov
    The refractor has less aperture (but no central obstruction) so you do not gather nearly as much light...but you have better contrast...

    If The Newt is mounted on a Gem boy the refractor will be much much more comfortable for you to use... if a Dob well then reverse everything the Dob would be much more comfortable...
    You may also see some false color in the refractor on bright objects
    and may have to "invest" in a Minus violet filter...

    Its a hard choice....I own both 100 mm f/6 and 127 mm f/9 refractors ... PLUS And I also own 8" and 11" scts....

    The 11" Sct is pier mounted in an observatory so lets forget about that scope...

    BUT on nice summer evenings when I feel like observing the old fashioned way from the lawn...I find that I use my small 100 refractor on a Gem quite a lot....If I do not use that I will use my 8i (8" Sct) as they both are easy to lug ouside set up and use... IF I am traveling to a star party etc the 8'Sct always goes....
    MY 127 mm Refractor (Meade AR-5) is on a Goto LXD55 moujnt and to be honest I use it about once a year as it is a pain to lug outside, much harder then the 100 mm scope to lug outside and set up ...and the 8" Sct kills it on all targets and is also easier to lug outside and set up...

    IF the Newt you mention was a dob... I would opt for it in a heart beat If on a Gem...this old boy would jump on the 120 mm refractor...

    Bob G
    CPC1100 housed in a slotted domed observatory (Exploradome) 4 and 5 inch refractors for use from the lawn, a 8" Sct (NS 8i) for star parties...
    I Hate the winter so I use heated Motorcycle clothing to stay warm while observing in winter
    Retired, also have 2 other hobbies
    1. tinker with older Corvettes (6 in garage)
    2. make a heck of a lot of sawdust in my wood shop.

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  4. #3
    Lenbo's Avatar
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    Default

    Hi Antonio. I have both scopes and the Skyview Pro manual mount. I originally purchased the 120 f8.3 achro and mount together. After using the 120mm for awhile I decided to add the 8" f4.9 reflector so I picked up a used OTA with rings and dovetail on the used market. I went to the reflector for the increased aperature. The first thing I noticed with the reflector on an equatorial mount was that it was cumbersome to use. The tube needs to be rotated often to keep the eyepiece in a reasonably comfortable position for viewing. Many folks are OK with it but I didn't like it so I eventually ended up with a homemade pier out back to use with the reflector. Basically I ended up using the reflector like a dob and I use the refractor on the Skyview Pro equatorial mount. As far as comparisons go I've found the refractor to be better with brighter objects like the moon and planets as well as open star clusters. The brighter objects are a little sharper in the refractor. Also, the equatorial mount is easier to use for tracking when an object is located. The reflector works a little better with dimmer objects like nebulae and galaxies. Dimmer objects are a little brighter with slightly more detail. To be honest, I don't see large differences between the two. I've seen dimmer objects with the refractor and brighter objects with the reflector. I'm in an orange zone so light pollution plays a role as well. I'm about half way through the Messier list using both scopes. My expectation is that the reflector will help as I continue to pursue the more difficult, dimmer objects. I'm really more of a casual observer so I'm sure our more experienced observers can give you more detailed feedback. Good luck with your purchase.
    Len
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  6. #4
    afigueroa's Avatar
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    Default

    Well thank you for your reply, now i dont have to much to do because i alraedy ordered the refractor 120 acro from orion, taking account i am a busy person my few hours need to be improved so reduce time setup, collimate, cooldown, etc. Also i have a son and the comodity to use the eyepiecein the top cold be complicated.

    I just hope no to loose to mucho with that 4" minor and need to buy another one in the short period....

    Regards
    Antonio
    120mm Orion Refractor Achromatic f/8.3, Explore Scientific Levy Comet Hunter 152mm f4.9, William Optics Megrez 90 APO, Sky View Pro Mount and Orion Atlas Mount
    Orion StarShoot Pro V2 Color CCD Camera, Canon 1000D (XS) / Orion Starshoot Planetary Imager III
    http://astrofotoamateur.blogspot.com/
    http://www.flickr.com/photos/astrofotoamateur/

  7. #5
    afigueroa's Avatar
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    Default

    I would like to buy a pair eyepieces and a barlow what you recomend to have several combination and also for lower magnification get the maxium field of view for DSO observation....?

    maybe a wide field around 40 mm will be cost more but if i can improve my field of view for DSO i will get it

    and one on 4 o 5 mm and 17 mm
    what do you think about orion expanse eyepieces?

    Regards
    Antonio
    120mm Orion Refractor Achromatic f/8.3, Explore Scientific Levy Comet Hunter 152mm f4.9, William Optics Megrez 90 APO, Sky View Pro Mount and Orion Atlas Mount
    Orion StarShoot Pro V2 Color CCD Camera, Canon 1000D (XS) / Orion Starshoot Planetary Imager III
    http://astrofotoamateur.blogspot.com/
    http://www.flickr.com/photos/astrofotoamateur/

 

 

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