Plossl lenses

[meddyliol]

I have two Plossl lenses, 10mm and 25mm. I am a little unsure as to what they should look like. My son had the telescope for a number of years and I recently had it back. The 10mm has a lens at one end, the other end has a metal tube internally threaded with nothing screwed into it. The 25mm is similar except that it has a lens screwed into the metal tube. It looks as if I will have to buy another 10mm Plossl doesn't it?

Thanks in anticipation

Brian

[nightfisher]

They sound like they are okay, but maybe post a picture of both together so we can see what you mean

[Uplooker]

They sound OK. As Jules says, post a picture. The internal threads are so that you can screw on 1.25 inch filters.

Ian

[Charic]

My Skywatcher supplied  'Super' 10mm and 25mm eyepieces are similar, the 10mm looks like something is missing but there isn't. Also the Skywatcher supplied  EPs are NOT Plossl, but Modified Achromats. Not sure of your brand as you don't mention.

[meddyliol]

I've just taken a few pics, hope they are good enough. How can I post them as attachments?

[meddyliol]

I think I have figured it out

 

[Mr Spock]

I looks like the 25mm has a Barlow lens screwed into it (the black bit at the bottom), take that off. The silver tube should be at the bottom and should be open ended. It is that part which slides into the telescope's draw tube.

[meddyliol]

Thank yo very much. That solves the mystery of where the 2x Barlow lens had gone. I thought I had two bits missing when in fact I don't have any missing.

Cheers

Brian  

[Mr Spock]

Your Barlow should look something like this http://www.firstlightoptics.com/skywatcher-eyepieces/skywatcher-deluxe-2x-barlow.html

[Charic]

..........Sorted, and definitely Plossl EP's 

[meddyliol]

Your Barlow should look something like this http://www.firstlightoptics.com/skywatcher-eyepieces/skywatcher-deluxe-2x-barlow.html

Thanks, mine does look like that now I've screwed the black bit on which was on the 25mm Plossl. 

   

[Charic]

If screwed directly to an EP it will give a slightly less power factor of about 1.5x instead of 2x if the original barlow+extension reads 2x.  So for the link above, your looking at a 2x Barlow. Just using the black lens cell will give @ 1.5x.  Barlows can also be stacked if you had two or more?

[meddyliol]

Sorry for being a little stupid  , but what is an EP?

[AstroAdam]

EP = Eyepiece

[meddyliol]

Told you I was stupid   All good answers though.

[ronin]

Told you I was stupid   All good answers though.

It is not stupid, it is the safe option of making 100% sure.

[AstroAdam]

No stupid questions. What you ask will always be there and answered for others to find through google or the forum search .

[nightfisher]

All sorted, by the way those are pretty good plossl`s, i still use a couple of these, the 20mm is very good for Luna A-focal imaging

[Charic]

......sorry meddyliol. abbreviations can be a pain in the donkey if you don't understand them. Yes I should have added 'eyepiece' after  EP. But now you know. Dont be afraid to ask further questions either, no doubt more abbreviations will appear?