Sir-Henry

Y'know ... Life!

Anyhoo. Decided, much at the last minute, to troll into town to ... (you don't need to know) in the Jaaag. That's the kind of bounder and cad that I am.

Nipped into Cash Converters and bought a chunky, butch watch with buttons that work! 😲Only 3 blue pics of Her Maj.

Then it was in to Cash Generators. What do I espy with my little optical organ?

Two Barlow lenses - 10mm and 20mm. Reduced from .... ❓❓

£9.99 to £4.99 ❗❗ 

Bring on the envy, suckazz 🤣

I would suggest that when buying eyepieces you factor in the odds that you might want to progress to a bigger scope in the not-so-distant future. If it's on the cards and you're 'made an offer you can't reuse' (horse's heads optional) then why not pick up a damn good lens or two that are beyond the capabilities of your current setup? Astronomy aside I've bought many tools several months or even years before I've had much - if any - use for them and later congratulated myself on the savings considering how much they cost by that time.

Oops! forget the X135. That would be the 12.5mm lense which doesn't fit the eyepiece tube without using the Barlow. Damn: I must be getting old ...

I have a question regarding objective lenses: Is there a single standard size for the barrel or several? Only one such lens (20mm) came with my scope and the ones from my Science Museum Magnum have smaller barrels so they could actually fall right through the eyepiece holder. There's a kludge I might be able to use in that the 3X Barlow that came with the Magnum is thicker at the top end so that it will just fit and then I can use a couple of the Magnum lenses in that. However that will put the magnification way over the top with anything under the 12mm (4mm effective) I would be transferring. Nor will I have much in the way of flexibility with just 2 lenses and the Barlow giving X45, X75, X135 and X225. Or could I be greedy wanting more intermediate mag factors?

As an afterthought: Do the filters screw into the lens barrel from the bottom or the top over the final objective lense?

And another afterrthought: Are spares reasily available for a Tasco Luminova? Mine came without the top caps.