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    Default Getting Started



    Hello, I got a telescope for my Christmas last year and got a little use out of it. However, most of my time was spent learning how to use it and getting a basic idea. I put it away during the summer months, as I'm always asleep during the dark hours of the night. Took it back out the other day to re-familiarise myself with it.

    I found Jupiter and managed to see the 4 moons. However, I'm not sure what I should expect to see and therefore whether or not I've got it right. When I found it I saw a large, round, out of focus white circle. Then when I adjusted the focus until it was sharp, I could then see a small, sharp spot of light but it was very small. I could see the four moons as tiny specs of sharp light in a line next to Jupiter. I could see no detail on the planet at all though. Maybe this is correct and what I should expect to see, or maybe I've done something wrong. I was in my back garden, so although there were no street lights nearby it wasn't completely dark.

    I have a celestron telescope ac 100/660 az inspire and had the 10mm eyepiece in.

    Any tips on what I should look for in my back garden? I had some great views of the moon already.

    Thanks for any help :-)
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    Default Re: Getting Started

    Hello and welcome. The problem with viewing Jupiter right now is that, from your latitude in Scotland, Jupiter is very low in the sky. This means you are looking through a thick blanket of atmosphere, which significantly degrades your view.

    You can't do anything about that, but you can determine at what time Jupiter is highest and try to catch it then. Keep trying; the seeing can change from night to night and even from one second to the next.

    You may be able to improve the quality of your views with a better EP and perhaps a better star diagonal. The unfortunate thing no one tells you is that the accessories that come with inexpensive scopes are not really that great. I have had wonderful views of Jupiter at as low as 27x; the planet is quite small, but nice and crisp (with good seeing). Your 10mm EP gives you 66x in that scope; I routinely view Jupiter at 68x with a 7mm EP in my 80mm scope, with excellent detail, but that is using a high-quality mirror star diagonal and EP.

    Your scope is capable of more magnification than you get with a 10mm EP; on good nights, you may be able to use a 6mm EP, but 10 is a reasonable place to start. More magnification does not necessarily mean a better view; Jupiter will look bigger at 100x, but dimmer and blurrier. And it will always be small. Jupiter's apparent size ranges from 30 - 50 arc-seconds depending on how far away it is from Earth at the time. The Moon, on the other hand, is 1800 arc-seconds. It isn't possible to get an eyepiece-filling image of Jupiter as you can with the Moon.

    Someone else who is familiar with your scope will most likely come along recommend some upgrades for a star diagonal and EPs.
    Mary


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    Vixen VMC200L, D=200mm, F=1950, f/9.75; Televue 2" Everbright diagonal. Coronado PST; AstroTech EDT 80mm, F=480, f/6. Mounts: Vixen SXW/Starbook (original); Stellarvue M2C alt-az. Eyepieces: Televue: 55mm Plossl, 22mm Panoptic, 17.3mm Delos, 13mm Nagler, c. 1980, 11mm Plossl, 7mm Nagler; Meade 15mm Super Plossl; VERNONSCOPE 2.4X
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    Default Re: Getting Started

    Thank you Mary, very helpful. To be honest, I was quite excited to see the moons line up, so it wasn't a complete failure.
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    Default Re: Getting Started

    Good advice from Mary, the two recommendations I would make is to replace the 1.25" diagonal that comes with your telescope and the two eyepieces.
    The diagonal is not good quality and can affect the views that you get but the first upgrade would be the eyepieces.
    The two that are included are known as Kellner design, these work well in long focal length telescopes but not that well in shorter ones like yours.

    A couple of good Plossl eyepieces and you will see a noticeable difference in the image quality.
    GSO makes a very good Plossl, excellent quality for the price: https://www.365astronomy.com/GSO-Sup...ssl-Eyepieces/
    I would replace your current ones with a 25mm and a 9mm as a starting point.
    A good diagonal upgrade: https://www.firstlightoptics.com/dia...nal-20967.html
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
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    Default Re: Getting Started

    Quote Originally Posted by fencer View Post
    Thank you Mary, very helpful. To be honest, I was quite excited to see the moons line up, so it wasn't a complete failure.
    You are welcome. No, not at failure at all. It's a very wonderful thing to see. You have the ability to appreciate these sights, so go with that. So much more out there to witness.

    As I predicted, Gabby has some ideas about upgrades. You have a nice scope and it will show you a lot. Better EPs and perhaps a better diagonal will reward you. It's always baby steps in this hobby, and baby steps have a price, ha ha.
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    Mary


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    Default Re: Getting Started

    Let the scope acclimate to the outside temperature for about 30 minutes. Make a 80mm aperture mask to increase the focal ratio. The mask that I use is simply made from a round piece of card board with a 80mm hole at the center. Use a #8 yellow filter. It really is a bummer that scopes come with very low grade eyepieces and etc.

    https://10minuteastronomy.wordpress....r-a-refractor/

    https://www.amazon.co.uk/Explore-Sci...gateway&sr=8-1

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    Default Re: Getting Started

    Thanks all - are Eyepieces standard fitting or do different ones fit in different scopes?

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    Default Re: Getting Started

    Quote Originally Posted by fencer View Post
    Thanks all - are Eyepieces standard fitting or do different ones fit in different scopes?
    Eyepieces are standardized. Most often at 1.25" barrel size followed by larger 2" eyepieces for the wide-field views. There are even a few 3" ones out there but these are usually very expensive and not usable with most scopes. A lot of older and vintage scopes use 0.965" eyepieces.

    Despite that, this does not mean that every eyepiece will be ok with any scope. The optical design of the scope and that of the eyepiece need to be in harmony for decent viewing. Depending on how the scope bends the light, a given eyepiece can either help correct that or further tie it into a pretzel.
    Bryan
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    f/5; Celestron C6-R f/8; ES AR127 f/6.4; ES AR127 f/9.4; Stellarvue SV102T f/7; ES AR102 f/9.8;
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    Eyepieces: GSO Super Plössl 40mm, 32mm, 15mm, 9mm; ES 82° Series; GSO Superview 30mm; Celestron Plössl 26mm, 20mm; ES 70° 25mm; ES Plössl 25mm; Vite Aspheric 23mm, 10mm, 4mm; Orion Expanse 20mm, 9mm; KK Ortho 18mm, 12.5mm; Bresser 70° 15mm; Coulter Optical 12.5mm; BCO 10mm; ES 62° 9mm; Zhumell Z Series 5mm
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    Default Re: Getting Started

    jessops.com/p/celestron/celestron-observer-s-accessory-kit-93309

    Is this kit any good?

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    Default Re: Getting Started

    No not really, the eyepieces are not much better quality than what your telescope came with and the coloured filters are poor quality. Basically dyed glass.
    The most useful part of the kit is the case itself.

    You can order some good quality GSO Plossl eyepieces from 365astronomy there in UK.
    The best price for a quality eyepiece. https://www.365astronomy.com/GSO-Sup...ssl-Eyepieces/
    refractordude, Jay6821 and fencer like this.
    Refractors: Antares 105 f/15, Celestron 150 f/8, Stellarvue NHNG 80 f/6.9, TAL 100RS f/10, TS 102 f/11, UR 70 f/10, Vixen SD115s f/7.7
    Mounts: Celestron SLT w/ pier mod & EQ-3 tripod, Celestron hypertuned CG-5 w/ tracking motor & Argo Navis, Manfrotto 028B w/ Stellarvue M2C, Manfrotto 055PRO w/ 128RC, TAL-1 HD EQ, Vixen SXP w/ HAL-130 SXG & half pier
    Diagonals: 2" Astro-Physics MaxBright, 2" Zeiss/ Baader prism, 2" Baader Herschel Wedge (Photo Version), 2" Orion Amici prism, 2" Stellarvue Dielectric, 2" TeleVue Everbrite
    Eyepieces: A-Z

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    The weakest link in the optical chain is the large nut located directly behind the eyepiece/ camera. - Gabrielle
    Ya gotta keep this Apo/
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    thing in some balance of perspective. Apos are awesome, but long focus Achros aren't that far behind them - Siriusandthepup (CN)

    Refractors kick arse precisely because they don't hide behind excuses. That is, they have no obstructions to hide behind. - Jon Isaacs (CN)

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