I wanted to like these 5mm eyepieces, but for some reason when observing from the 20mm eye relief point, the glass looks blurry.

It's strange because when I had my eyes closer, they seemed to disappear.

I wear glasses so initially I thought it was due to them, but then when I was observing without my glasses, I saw the same streaks or lines in the glass. I have two of these for bino viewing with my Baader Maxbright II , and both of them were acting the same.
when I folded down the cups ( they actually screw down) and got my eyes way up to the glass, around the 5mm mark, those lines disappeared.

This is also true when holding the eyepiece up to the bright sky. when looking into them with the cups up, those lines appear against the sky and when I fold them down to get my eye much closer, those lines disappear.
so I'm definitely sure it's not other equipment having an influence to bring about this phenomenon.

P.s To try and explain what these lines look like, they look like someone smudged some fairy liquid soap onto the lenses giving off streaks of lines with a rainbow effect. kind of how prisms affect light. very annoying when observing the moon. not so much with small planets against a dark background.


I can't speak for the other focal lengths of this brand, but I had to return the 5mm and I'm grateful to FLO honour their 30-day return policy.

so to conclude:
what I like:
The feel and quality of the outer body.

what I don't like:
can't benefit from the 20mm eye relief. They only work well at 5-10 mm mark because if the issue stated above.

This was purchased as an extra lens to go with the 25mm and 10mm supplied with the telescope. The extra magnification and definition this provides is incredible. Highly recommended.

I had other Starguider eyepieces before buying the 5mm, and like the rest of the range, it gives a good performance at the price. I can't see any obvious faults with the definition, which is maintained well even at the edges. There's a bit of pincushion distortion, but very few eyepieces are entirely without this, in my experience, and it isn't as serious a fault in an eyepiece as it would be in a photographic objective. I've bought the entire range, because of the reasonable price, with the exception of the 15mm, which is too close to the 12mm and 18mm if you already have these. Because of the cost, I've been able to buy two examples of some of them, to use with a pair of 100mm binoculars. They fit this purpose very well, as the rigid screw-up eyecups can be rested precisely against the orbital bone around the eye, which makes it easier to keep the exit pupils of the binoculars aligned with both eyes at once. This is also useful on a telescope, where these eyecups help to keep the eyepiece accurately positioned in bright light at high magnification, when you have to aim a narrow exit pupil into your narrow eye pupil.

Used with skywatcher 127mm to take it to 300x. Live in bortel 4 area . Very good build quality and will last for years. Great views of venus edge to edge. Slight blaring at this range but still good. Nice 60 degrees FOV. No aberration noted. Getting about 35 seconds before adjusting the tracking. Very good quality and very please. Would definitely recommend.

I've read many positive comments about this eyepieces before buying one. I must admit that the hype is real. These are very good value for money. Sharp all the way to the edges, excellent AC control, comfortable EF, good build quality. All this goodies for an excellent price. I'll be buying another one for sure

I decided to upgrade from the basic plossl eyepieces I got with my scope (a Skywatcher 8inch dobsonian). There’s a lot of choice out there, some of which are really expensive. I didn’t want to go really low budget but also didn’t want to break the bank. I decided upon BST 5mm and 12mm starguider eyepieces. As I’m mostly viewing the moon and planets, these seemed the right fit for me. In a word “amazing”! It’s like I’ve bought a much better telescope. I’ve had 4 nights of using them on the moon so far, the detail is crystal clear and the FoV and eye relief are excellent (I wear glasses). Going to try the 25mm next. Highly recommended.

Best suited to moderate focal length telescopes to deliver a high power view. Generous field of view and eye relief make it a pleasure to use. Excellent value.

I'm using it with 72ED. works quite nice. The image quality is good. Jupiter feels very close when I'm using it.

Well put together eyepiece that gives a decently corrected image on axis and out to about 80% of the field. Comfortable twist up eyecup. This range of eyepieces are a very good stepping stone from the ones supplied with most telescopes

Really impressed with the quality feel of these eyepieces. They are a 110% improvement on my previous eyepieces giving a bright, clear and sharp view.