Baader Hyperion 5mm - rattle?

[RobSay]

Evening - just got in from a short evening session, mostly lower power stuff (12" Dob) as conditions limited seeing.

Having played with the 36-16mm range I took the opportunity to check a 5mm Hyperion I picked up in the summer. Optics looked OK and it's working as expected (based on conditions). Everything seems fine .. except that there's rattle in the main body of the EP which I'm fairly sure shouldn't be there!

Can anyone with a 5mm (or other) confirm that they don't rattle?

Has anyone had a similar thing?

Any had experience of maintenance on these or got suggestions for cause?

thanks

Rob

[faulksy]

spoke to rvo about this and they said they are surposed to, its the air to glass clearance to allow for thermal expansion so the glass doesnt break

[Karen]

Just checked my 21mm and 13mm and they don't rattle. But if the bottom lens is not screwed up tight they definately do.

[Macavity]

It might be worth checking... (Outer) Lens elements have retaining rings that can be accessed via e.g. "watchmakers screwdrivers". If you feel confident (that is a must!) just push gently into the "slot" in appropriate direction? I'm not convinced lens elements need to be loose. Frankly, I prefer my eyepieces NOT to rattle.

[Stephen]

Haven't owned a 5mm, but my 3.5, 8 and 17mm's did not rattle and I wouldn't be happy if they did

[Luke]

We had several Hyperions including the 5mm and I don't remember any of them rattling.

The one thing I do have that rattles is my Baader NeoDymium filter, though apparently you can tighten that up with a toothpick if you are careful.

[GazOC]

I've got the full set and none of them rattle.

[Carbon Brush]

As GazOC. My (almost) full set dosen't rattle.

In fact I can't remember having ANY eyepiece that rattled by design.

Interesting advice to faulksy from RVO, to say the least.

[Karen]

It might be worth checking... (Outer) Lens elements have retaining rings that can be accessed via e.g. "watchmakers screwdrivers". If you feel confident (that is a must!) just push gently into the "slot" in appropriate direction? I'm not convinced lens elements need to be loose. Frankly, I prefer my eyepieces NOT to rattle.

I have done this with a Burgess planetary, very gently and just enough to hold the lense firmly.

Hyperions are a different matter.

I've had a good look behind the bottom lenses and under the top rubber covers and no retaining rings are apparent. It seems like the lens elements are held in place by the various threaded barrel sections. Assembled with locktite in the factory I believe

[smudgeball]

Strange?

My 13mm doesn't rattle?

If it is by design surely some "gap filling" material would be used? i.e. some fine foam round the edge.

Rattle suggests noise which suggests glass hitting metal

Can't believe that would be ok.

I can understand movement but not things "hitting" each other ?

Let us know if you get to the bottom of it and hope there's no damage.

Neil

[Veracocha]

I've got the full set and none of them rattle.

Same here, not a sound.

[RobSay]

The rattle was definitely more than expansion space. The sound of metal on glass offended my mechanical sensibilities

It might be worth checking... (Outer) Lens elements have retaining rings that can be accessed via e.g. "watchmakers screwdrivers". If you feel confident (that is a must!) just push gently into the "slot" in appropriate direction? I'm not convinced lens elements need to be loose. Frankly, I prefer my eyepieces NOT to rattle.

Bingo! A slow and careful examination of the disassembled EP shows the first element in the upper body moving slightly. The retaining ring is easily tightened and once reassembled the rattle is gone.

Now the interesting thing is that if I undo the EP body once again the retaining ring is loosened at the same time(!) and the rattle returns. so the lower body is binding on the retaining ring a little. Incidentally the EP unscrewed easily at the middle joint (Where the branding is) and no evidence of glue as per documentation - don't know if the previous owner had already been in.

My understanding is that the 2" filter insertion point is at the lower separation point (where the 1.25" barrel joins the 2" body) so theoretically one shouldn't need to go in to the main body at all.

Thanks for all the responses - v. helpful.

Rob

[faulksy]

As GazOC. My (almost) full set dosen't rattle.

In fact I can't remember having ANY eyepiece that rattled by design.

Interesting advice to faulksy from RVO, to say the least.

should of said my 21mm doesnt rattle but when i ordered from rvo adam told me most do its a design feature?

[damnut]

My hyperion 5mm does not rattle --- Yet, not shaken it enough :-)

[Macavity]

My Telescope Service "HR Planetary" eyepieces, rattled like mad! The lenses were almost falling out! Well, maybe not quite, But! This DOES happen though, and it's a good thing [iMO] to (reasonably) tighten anything that is obviously loose...