Old HDF Eypiece Identification (2 Viewers)

[Lincs Mike]

Hi,

I have am MM4 60 with the SDL v2 zoom. Like many it seems I wanted to try a fixed eyepiece, so I took a punt on one on e-bay. It looked quite old and I had some doubts about it fitting the MM4. But it does, so thats good!

Not tried it in the field yet, but is appears reasonably bright and gives a wider field than the SDL2 zoom, so all good.

Markings on it suggested it gives 28x on HR60/HR66, so assumed it would give similar on the MM4 60, but I have the feeling its short of that. So can anyone identify its vintage and number, such that I can find the focal length? It looks older than the ones I can find on a google search.

Photo attached (hopefully)

Thanks
Mike

 

[SimonLS]

23x on the MM4 60mm if the specs on this eyepiece (possibly an updated version) are anything to go by: 40831 HDF T WW Eyepiece

 

[Boogieshrew]

Yes I think 23x too. It's a nightmare CE eyepiece and I like 23x, not too low, not too high.
Having said that I love the 17x ep on my MM4 so right and wide.

Edit- not "a nightmare CE eye piece". It's a nice eyepiece. Predictive text strikes again!

 

[wllmspd]

Previous version of this maybe.. East of England Binoculars - Opticron HR80 Eyepiece HDF38x the 40831 is a tiny eyepiece. This one is before Opticron took to listing all the scope and magnification options on the side.


Peter

 

[Lincs Mike]

Thanks everyone. I probably should have realised it would be 23x, but looked so visually different to the current 40831.

I guess it must be at least 20 years old, is it likely to be much inferior to the current version? I have not had it out in anger yet, but still seems decent to my inexperienced eye.

 

[wllmspd]

If it gives you good views then enjoy. I’ve gone birding with only the 23x and not found I was missing much… didn’t even use my binos that trip, just the 23x. Depends where you’re observing of course.

Peter

 

[pete_gamby]

It's an old version of the 40809 HDF - pre-dates my time at Opticron so can't enlighten on whether it was optically improved upon. Some info on the 40809 here:

Opticron - Eyepieces Archive

HTH

Cheers, Pete