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SVBONY Telescope Lenses 25mm Telescope Accessory 1.25 inches Lens Fully Coated Telescope Lenses Plossl 40-Deg for Astronomy Telescope?
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Ah okay! Sorry, I misunderstood, but it happens quite frequently.
> pretty good
Yes- For $50 that's great :-)
You wrote you have the EQ mount figured out, so I'll spare you with links.
But, do you have a guide such as "Turn left at Orion"? It's very useful, basically the missing manual on how to observe, what to expect, and what's worthwhile observing in small to medium telescopes. (An older copy is fine.)
> around 23-25mm
32mm will show the largest field possible, but of course the "exit pupil" get's a bit large in F/4. Depends on how dark your sky gets.
A 25mm Plössl is pretty affordable.
So no need to get the poor 62° eyepieces really.
If you want a larger field, the 20mm "gold-line", or just a 32mm despite a bit too large exit-pupil-
Do you have binoculars? A lot of DSO are already visible in hose.
Field of view simulation;
You can set up telescope and eyepieces in http://stellarium.org, (visual impression differs to images of course)
one of my favorites (as it simulates the size of the apparent field), https://www.sternfreunde-muenster.de/ocalc.php
and the great https://astronomy.tools/calculators/field_of_view/
> and gave me a few tips as well.
...but only gave you one eyepiece, mean! ;-)
Clear skies!
Get a 25mm Plossl Eyepiece (4-element lens, means it will have no false color fringing and a pleasant field of view) as a start. You can get one identical to the Orion unit it came with from svbony on amazon. Then either a 10mm Plossl (which the scope originally came with) or 9mm Goldline (66 degree ultra-wide-angle) eyepiece.
After that, go to lower powers if you like deep sky and stargazing (32mm Plossl), as they offer more surface brightness and a wider field of view. Or go for higher power if you want to look at planets and the Moon: svbony sells an achromatic 2x Barlow and the 6mm Goldline, which together will provide 108x and 216x, enough to appreciate the planets at two good magnifications as conditions allow.
Orion 25mm Plossl (which should be identical to the svbony unit, just at a higher price): https://www.amazon.com/Orion-8741-Sirius-Telescope-Eyepiece/dp/B000UIW9A6/ref=sr_1_2?dchild=1&keywords=orion+25mm+plossl&qid=1606079249&s=electronics&sr=1-2
Svbony Goldline: https://www.amazon.com/dp/B01MR78I42/ref=twister_B07JHKZQG9?_encoding=UTF8&psc=1
(Redlines are the same optics as Goldlines, just with a different casing)
Svbony 2x Achromatic Barlow: https://www.amazon.com/SVBONY-Magnification-Broadband-Standard-Telescope/dp/B076MR55QQ/ref=sr_1_1?dchild=1&keywords=svbony+2x+achromatic+barlow&qid=1606079346&s=electronics&sr=1-1
Svbony 32mm Plossl
I have the 15mm and 6mm Goldline and like them a lot. The 2x Barlow is also surprisingly good for the price. Plossls are the standard for high quality eyepieces in focal lengths longer than 9-10mm.
The whole goldline/redline set is good too if you'd prefer to get them instead of a Plossl.
Magnification = Focal Length of Telescope / Focal Length of Eyepiece
So larger numbers means less magnification, which is actually a GOOD thing, for finding and viewing most objects.
As far as I can tell, svbony is simply a resale company for the same manufacturers that make celestron, orion, and meade accessories, so the plossls should be identical to orion sirius plossls and the goldlines are known to be identical to the orion expanse eyepieces.
Here's a more in-depth guide to eyepieces: https://gregorium-sidus.blogspot.com/2020/09/a-beginners-guide-to-budget-eyepieces.html
TL;DR: Get a 25mm Plossl and a 9mm Goldline eyepiece and MAYBE a 2x Barlow at first, then higher powers can come later.
Ah, allright. The aperture ratio has a few down-sides (that's why we recommend the Zhumell z130, AWB OneSky and such here). But it's still a more capable telescope then what you'll usually find in this price-range.
For planets, consider the 4mm 58°, https://www.aliexpress.com/item/32823985645.html or 3.2mm - https://www.aliexpress.com/item/4000975459220.html // https://www.aliexpress.com/item/32790319139.html (Random links, check recent seller ratings).
They cost $49 at Amazon when in stock, $55 at Agenaastro.
Do not push the telescope much beyond. The 2.5mm HR Planetary will give you 200x, but due to the aperture ratio you'll already get a dim and dull image. More isn't better (http://blog.pixelgiraffe.com/wp-content/uploads/2020/07/5MagnificationSaturn-crop.png).
As for a larger overview, the 20mm will do allright, but it's not the best at ~f/4 (https://imgur.com/a/lzlNKnd). A 32mm Plössl would show the largest field, but the exit pupil gets very/too large (http://blog.pixelgiraffe.com/wp-content/uploads/2020/07/exit-pupil-small.png). You can get a 25mm Plössl cheaply (random link). But if you have the 20mm already, you can of course observe with it. The field will be somewhat similar.
Don't get a barlow unless it's for a DSLR. Especially cheap ones introduce chromatic aberrations. A better one will cost more than 2-3 dedicated eyepieces.
Even with a DSLR; you won't be able to capture deep-sky objects other than a few bright ones (Albireo, Orion nebula, CR399 and such).
Clear skies :-)
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