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SVBONY Eyepieces 4mm Telescopes Lens Wide Angle 62 Degree Aspheric Eyepiece HD Fully Coated Telescope Accessory for 1.25 inches Astronomic Telescopes?
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Absolute hard no on this. I'll be the first to tell you that you don't need expensive eyepieces to get a good view, but those 62 degree aspherics are the only eyepieces I've ever looked through where they are just objectively flawed in very obvious ways, and below what I would consider "minimum usable quality". The 4mm is the worst of the whole line. In most cases, the telescope is the weak link in the optical train. In this case, it's these eyepieces (unless maybe using them with a really, really crappy telescope)
As far as all the others, they will have about 2mm of effective eye relief. You will have to press your eye into them to see the field of view. By all accounts, Plossls below about 10mm should not even exist. Their eye relief is just too short.
There are no good 4mm eyepieces at your price point from Amazon. You will have to go to AliExpress to find a "4mm 58 degree planetary" for around $25-35. But you will have to wait several weeks for them to come in from China.
Yeah its pretty limited, I'll look into that eyepiece and what do you think of this one? And thanks for the reply
I found this one , im prob gonna get this one because its around the same price plus shipping to that celestron eyepiece i was planning on getting, i want a 4mm eyepiece, ill upgrade in the future for example a 6mm eyepiece with a 2x barlow or something like that, ill see.
I don't have a 5mm lens but
Using this lens: SVBONY Telescope Lens 4mm... https://www.amazon.com/dp/B01J7Z1YV2?ref=yo_pop_ma_swf
Venus: My experience with Venus was hindered by my astigmatism. So I could resolve Venus as a disk but I could never get it focused enough to see the phases.
Jupiter: I could see the planet and with very clear, good, seeing conditions I could make out some of the gas bands. I definitely could see its moons. It was dark.
Saturn: Saturn was the best target. Under near perfect seeing conditions I could resolve the Cassini division but I couldn't take a picture of it. It was also dark.
Mars: At the time Mars was experiencing a global dust storm and was too close to Earth which made it too bright to see any details.
The Moon: The 4mm eyepiece is really good at resolving details of the Moon's surface. But there's a lot of chromatic aberration with that lens.
DSO's and Double Stars: The 4mm eyepiece could resolve many of my targets but they were way too dark. I had much better seeing with the stock 24mm lens and a 2x Barlow.
All in all the 4mm eyepiece could resolve many of my targets but they were way too dark. On many of the websites, where I've done research for the scope, there seems to be a consensus that lenses ranging from 6 to 9mm are perfect for doing planetary seeing. With lenses you get what you pay for. If you're dead set on a 5mm eyepiece then I'd say commit to a lens with a wide view and a large exit pupil.
Do your research before you spend your money. I made a few bad lens purchases without much knowledge about lenses and the capabilities of our telescope. Learn about how to see in the dark and to learn about how your brain and eyes work together to reveal details you didn't see days before. If you can go get your eyes checked at an optometrist. Find out what your pupil distance is in the dark.
Do your research.
I have this one:
SVBONY Eyepieces 4mm Telescopes Lens Wide Angle 62 Degree Aspheric Eyepiece HD Fully Coated Lens for 1.25 inches Astronomic Telescopes https://www.amazon.com/dp/B01J7Z1YV2/ref=cm_sw_r_cp_api_i_Aj0nFb86WNDWT
This is the eyepiece I used with Sky-Watcher Mercury 707.
Are there any (inexpensive) eyepieces you'd recommend? I'm looking at this 4mm SVBONY or maybe, although a bit more expensive, this Celestron one. Would either of these work well? They'd bump my magnification up to x300 or x240 respectively.
I'm planning to get https://www.amazon.com/gp/product/B01J7Z1YV2/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1
My 9mm suffers from horrible internal reflection due to it not being blackened.
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Is the one i linked good?
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