ok another stupid question from the newb about lens

[harmonyceilings01]

So the scope i got comes with 5 lens..

sr4mm

h8mm

h12.5mm

h20mm

and a 25mm

I thought the 25 would give the most magnification considering it was the biggest, but am i wrong? bc it seems like from seeing what people are typing on here that the smaller, the more magnified? stupid question i'm sure, i should probably know this, but i don't lol.

[Lenny147]

Yep the smaller the number the more magnification. Try looking up some eyepiece threads on here

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[harmonyceilings01]

well i feel dumb lol.......no wonder i couldn't find much

[DirkSteele]

Take the focal length of your scope, lets say as an example 1000mm and divide that by the focal length of the eyepiece, say 25mm, and that gives you the magnification produced in your scope. In this example the result is 40x.

[harmonyceilings01]

just calculated it and i will go from a 40x magnification to a 250x magnification using the 4mm. wow......very interesting. glad i joined this group lol

[Stu]

The magnification is given by the focal length of your scope, divided by the focal length of the eyepiece. So say your scope focal length is 1000mm, a 25mm ep will give x40, a 10mm will give x100

Hope that helps

Stu

[John]

Low magnification is very useful though - most deep sky objects are best viewed at low or medium magnification. High magnifications (ie: your 4mm eyepiece) are for the moon and planets.

Depending on the scope you have, 250x may well be too much most of the time.

[Stu]

Must type faster!! :-)

[harmonyceilings01]

Right now what I'm focusing on are the moon and planets. I figure a few things at a time lol.....but after thinking the moon was awesome with a 25mm I'm getting excited to magnify it more now!!!!

[SnakeyJ]

Harmony,

Just to add a barlow lens magnifies by reducing the focal length - ie a 2x barlow reduces a 10mm EP to 5mm, effectively doubling the magnification. A decent barlow can reduce the number of EPs you need - so if you had a 32mm, 25mm and 8mm a 2x barlow would add 16mm, 12.5mm and 4mm.

Regards - Jake

[Mikester]

Hey there everybody,

As a newb to all this myself, I made the mistake of going for high magnification recently... Turned out to be "too high." Even tho my scope's useful mag is supposed to be 300x (Celestron 5SE), I figured a 5mm EP would be perfect for 250x. What I failed to realize was also that there also needed to be a correlation to the exit pupil being 1mm or more for focus/ decent viewing... In my case (F10 scope), I learned that a millimeter per "F" was just about right. So I sent the 5mm EP back for a 9mm EP (139x) ; which is not ideal (.9mm exit), but will suffice in good viewing conditions. And with a 6.3 focal reducer it should "theoretically" work nicely- please correct me if I'm wrong.

The more I read, the more I realize there is to learn=)

[midnight_sky_watcher]

Hi Harmony. Never feel dumb. everybody on here was a beginner at one time, there is no such a thing as a stupid question.

Grant......

Cornwall.....

[Lenny147]

Yep we all started somewhere. And that's why most of us came here in the first place

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[skir]

'The only stupid question is the one you don't ask'. Well that's my excuse and I'm sticking to it!