A question from a "newbie" about Naglers (probably

Hello,

I just recently jumped to a large
aperture dobsonian, having just

acquired an 18" Obsession. I have

been collecting eyepieces here on

Astromart for a little while now and

have, what is probably the stupidest

question ever asked--it will only

betray how green I am when it comes to

the "big stuff" (I've never owned

a Nagler, or any big, expensive ep).

On the 9mm & 12mm Naglers there is a 1

& 1/4 barrel to insert in the scope,

and in a little further, a 2" barrel.

The 2" has a little screw in it's side

that is tightened onto the 1 & 1/4

part. What is the screw for? How do

you use the 2" part for viewing since

the 1 & 1/4 part is in the way? Is

the 2" supposed to be used for

viewing, or is that just the way they

taper down to the 1 & 1/4? It just

seems to me that these ep's would be

2" & not 1 & 1/4--especially the

12mm. Is the 1&1/4 part removable?

Ok, I asked more than one question,

but I hope you get the jest of my

ignorance and can shed some light for

us little ep guys--it looks like some

kind of add-on for 1&1/4" scopes, but

I can't figure it out, and don't want

to venture taking apart an ep without

knowing what I'm doing. I'm sure

y'all will be laughing when you read

this , but you've got to ask

sooner or later--I'll go for sooner.

Kind Regards,

Chris Palacios

THese are 1.25 eyepieces with a convenient and permanently installed two inch adapter. THey perform just like a 1.25 eyepiece should, and get no optical benefit from the two inch adapter. To use them, just unscrew the screw that gets in the way of the focuser tube.

By the way, don't disassemble and remove one of the sizes of tube--you will find them useful at different times with different scopes. And neither really interferes with the other.

And if you think this is a dumb question, just realize that it has been asked many times before, (even on this forum in the last couple of months......I used to ask this same question.

Alex