On 30/08/2012 00:18, Howard Lester wrote:


On Wednesday, August 29, 2012 10:38:06 AM UTC-7, Yousuf Khan wrote:

That's because it's hard to find the information. Looking through the

manual (really just a pamphlet):



focal length: 700mm f/9

eye-pieces: SR4mm, H12.5mm, H20mm

Apertu 76mm (3")

3X Barlow lens, 1.5X Erecting lens.

Considering the above descriptions, I can almost guarantee they're
0.965" eyepieces, which is (or at least was 50 years ago) the standard
size for microscope eyepieces. No one I know of anymore makes Huygens or
Symmetrical eyepieces in 1-1/4". By the way, you can put the Barlow
away... The magnification it can provide with your setup is way too high
for what it can possibly use.

Actually they do. The modern toy scopes above a certain price point do
now have exactly this set of eyepieces in 1.25" fitting. But still
including the nearly useless 4mm Ramsden and utterly dire 3x Barlow.

26mm, 16mm, 10mm + 2x Barlow would make a lot more sense.

The OP might like to look at Surplus shed for budget eyepieces that
might help fill in the gaps. He could do with something around 32mm.
(or shorter 26mm if it is a 0.965 tube)

--
Regards,
Martin Brown