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  1. #1
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    Default first look at moon through 120mm refractor (omni xlt 120) HELP!



    Hi all......can you help ....my first look through my new 120mm aperture celestron omni xlt achromatic refractor tonight throws up some questions...first it had not cooled down second the moon was quite low in sky...so bearing that in mind i tried a few eyepieces for my 1000mm acro refractor and well i was thrilled with the 32mm digiscope eyepiece (from revelation astro kit ) it seemed sharp and contrasty, v little fringing...then the 15?mm and 9mm and..such a disappointment as it was not contrasty...had problem with focus and not blurred but just poor seeing..not sharp......
    is the refractor capable of more...did the digiscope widefield eyepiece promise better things to come esp if i buy some better eyepieces... (baader hyperions/televue £££££!!) ..
    Are the higher mag plossl underperforming or was it bad seeing at that angle plus no cooldown of scope....also i assume it is collimated but am not sure...

    should i change to a maksutov 5 inch like the synscan skywatcher 127 (is it?) WHICH IS MORE PORTABLE AND GOTO OR OR ...OR

    should i persevere and get ultimately 2 inch diagonal/eyepieces and this is the important question.. IS THIS SCOPE GOING TO GIVE ME CONTRASTY SHARP IMAGES OF MOON AT HIGH MAG? DOES IT HAVE THE ABILITY TO DO THIS??

    Can anyone advise...ps not much fringing if any...but through 9mm eyepiece (multicoated plossl ) it was not clear, sharp, exciting....i felt disappointed really...is this because my last scope the celestron nexstar 4 inch mak with baader hyperion was so sharp and contrasty...

    Do i need the higher mag a skywatcher 127 mak 5 inch can give me.... or what...this scope can apparently with a focal reducer do widefield too...

    certainly on my refractor stars are sharp.... oh dear what shall i do....
    thanks for reading pete

  2. #2
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    Default

    Hi Pete ...I would say because of the seeing conditions the view was poor ..You said it was low on the horizon ? You were looking through a lot of air and anything that was floating in the air ...Who makes the other two eyepieces ? The omni series of scopes are great little performers ..I would say , try again when the moon is higher and air is more stable ..What was the temperature that day ?
    16in Night sky
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    Pete, I'm just going to second Rich's remarks. You have a fine scope there, and it will always perform to the ambient conditions. Sure, you can control factors like collimation and good ep's, etc., but in the end the better the conditions the better the performance.



    Bob
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    Yes, thanks for replies... i briefly put scope on pillo on car roof and moon was low prob 25 to 30 deg...and it was a warm day and not cold yet last night....certainly the 32mm eyepiece gave a wow view which made me think.....these are fine optics. the plossl are from the revelation astro eyepiece set , 4 element multicoated? one of the things i am aware of is that the amount of observing time (what with early work starts) etc and set up without goto makes one aware that you have to have perhaps more realistic expectations and keep a scope for a while...long while (bit like a new camera) and get to know it? ........... please keep the comments coming...it is a great help.....thanks

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    Default

    Hi Pete ...There are some great eyepiece threads ..Both on coatings , types of eyepieces and field's of views ... Check them out , they might help with some of your questions ... They are in the telescope forum under telescope eyepieces forum...Hope this helps a little ...
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    Default

    Hi Pete,

    Welcome to the forum.

    Viewing with your new telescope. You will find that on some nights you can crank up the magnification and on other nights……well forget it. Generally the lower power, the higher definition, etc. This is true for your scope as well as for the 127 skywatcher you mentioned.

    I'm a relatively new comer and still classify myself as a beginner. The big lesson (expensive) I've learned this past year is by and large it ain't the equipment, its the person using it. I started out last September with cheap 90mm plastic telescope that came mounted on a Meade DS2000 goto mount. I must admit I have a low tolerance for frustration and the goto mount was heaven sent for me. I ditched the plastic refractor and installed a 102 mm SCT I'd owned but not used for 25 years or so on the DS2000 mount. Then came the first mistake ($$$$) I got aperture fever and bought a 150mm SCT and invested a small fortune in goto mounts for it.

    Big mistake. What I should have purchased was a good pair of binoculars around 10x50 or 10x70 to go with my 102 mm SCT. When I say good, I mean good. I have some very cheap 8x50 binoculars but the 6x30 finder scope on my 150mm SCT shows fainter stars. The C6S SCT is an excellent telescope and I am very happy with it. However, it came with a CG5 mount and its 55 pounds, while movable, is not portable…. I go for convenience and often grab the 102MM SCT on the DS2000 mount in one hand and my backpack with accessories in the other, go out the back door and am in business within a few minutes. I practice star hopping until things cool down then get to work.

    GOTO mounts. I have three and frankly haven't had much luck with them. Two are back at the vendor's at the moment getting repaired. The third, the Meade DS2000 mount, like the Timex watches of old, just keeps on ticking. I have my 102mm SCT attached to it and the combination is my favorite scope.... a super grab and go scope. Over the past year, my seeing skills have developed and I am often amazed what I can see in my 102mm SCT.

    One of my ailing goto mounts is a SkyWatcher SynScan Alt/Az GOTO. I purchased it to make my C6S SCT a grab and go and until the mount went belly up recently, the combination was super, not a portable as the 102 mm SCT on the Meade mount, but portable enough.

    You will not gain much going from a 120 mm to 127 mm aperture scope given equal quality optics. You certainly will not gain much regarding magnification and seeing abilities. If you are bound and determined to get another scope and want goto, then go to at least a 150 mm one, the Celestron 6SE is a good candidate as Celestron just dropped it price by $200. If you drop the goto, then your options expand far more.

    Frankly, even with the not so stellar experience I’ve had with goto mounts, I would not be without at least one goto telescope. I am located in a highly light polluted area where gotos often mean the difference between finding objects and finding nothing …. you can’t star hop if you can’t see the stars. I find that my goto is a great teaching aid to learn the nigh skies. However, so are a good pair of binoculars.

    Again, Welcome to the forum.

    Joe
    Sxinias
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  8. #7
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    Default should i put what in here when replying....

    Joe, i thank you for reply.....well i found acro so unwieldy that seller is willing to take back for small loss and hope to get skywatcher pro 150 a 6"mak i believe plus case. so all i need is a goto mount or just a nongoto mount...which maybe all i want to spend....although the mak can't take 2" star diagonal (well can cheat but vignetting issues i read) i bought a focal reducer and i feel pleased but do not want to spend any more. the moon the other night in the omni xlt 120 (which is going back...too unwieldy) was amazing.....i was impressed with the optics i really was....hope to chat more but need to dash best...pete

 

 

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