Which telescope lens is stronger 10mm or 20mm?

However in practice, its magnifying power is limited by the amount of light the telescope is consuming, which is to say, its aperture. Every increase in magnification is zooming in on a smaller and smaller area, which means it is considering a smaller and smaller fraction of the initial amount of light.

That is clearly a bit high for most circumstances, so let’s opt for a 4mm eyepiece for 300x and an exit pupil of 0.9mm. A good magnification of 300x is a stretch on many nights, so a 5mm eyepiece that gives 240x would work as well.

What’s The Difference Between Your 1 25 And The 2 2 Eyepiece?

An eye relief around 6mm to 8mm is much more comfortable for me personally. Eyepieces that are “parfocal” could be interchanged without the need for refocusing. That is desirable when switching eyepieces while looking at the same object.

Commonthat the atmospheric seeing conditions will allow you to use these eyepieces on a longer focal length telescope because they’re very low power. The highest useful magnification of the Celestron Travel Scope 70 is approximately 165x. Even then the image at the eyepiece is going to be dim at that magnification. The magnification of the eyepiece could be adjusted to magnify or decrease the size of any object that’s being examined.
Mars was prominent and we saw that, and I also seem to recall vaguely making out the stripes on jupiter OR saturn’s rings… It was cold out and I recall attempting to steady it laying on the cold ground. It is cloudy but when an obvious night, cant wait to learn how to setup and then use the telescope.

Eyepieces

telescope. It is the measurement that’s advertised for some eyepieces…82º, 68º, etc. True field of view is the width of the view if it is paired with a telescope, and it’s called “true” as you won’t be doing much observing with just an eyepiece alone!

• Putting it simple, Barlow lenses are a cost-effective way to raise the magnification of one’s eyepieces.
• Or even if you go a totally different route and get an 8″ Dob like so many recommend, the 130mm scope is a useful “grand and go” scope that is quicker and better to set up and use.
• For anyone who is wearing glasses, utilizing a high powered eyepiece could be a huge problem.
• Exit pupil can be considered in setting the minimum magnification you can test to get having an eyepiece as well as your telescope.

Quality Barlow lens from Celestron, with multi-coated lenses for 2x magnification. Can take practice to use—friction of turning the zoom can move the telescope from its position. Rubberized eyepiece with folding eyecup, for both glasses and non-glasses wearers.
Many of us live in light polluted skies and finding dim things is hard. Takes patience to help keep planets in frame and there’s extended vibration after tweaking the focus. The scope itself seems promising but I get why this is usually a beginner’s rig. Almost as an afterthought after blowing my mind with the two planets, I returned to Starsense and used it to get Vega, Pleiades, M39 and Mars prior to the clouds closed in completely.

Some amateur astronomers would argue with me for certain that using only the eyepiece is preferable to using a Barlow lens. Buying a Barlow lens with more optical elements inside can be crucial. Low-quality Barlow lenses using only one optical element will destroy the quality of the image. The bigger end of the Barlow lens is Powermate with 4 or more optical elements. Barlow lens is not an eyepiece, and you also still need an eyepiece if you work with the Barlow lens in the focuser. This short YouTube video, from leading telescope manufacturer Celestron, clearly explains how to calculate the magnification of your telescope. Not ideal for use with binoviewer telescopes—hard to align two pieces exactly the same.
The Plössl is so desirable since it offers great standards of colour and eye relief. Just like the Orthoscopic, the field of view is commonly limited to 50°. Generally speaking, higher magnification works for the moon and planets too, because they’re brighter objects to train your telescope on. A helpful rule of thumb for maximum magnification seems to be to limit you to ultimately double the aperture of one’s telescope in millimetres.
By using this Barlow with that telescope and eyepieces, you’ll get two additional magnifications. Remember the magnification formula inside our example with a 1000mm focal length telescope? It is not affecting the focal amount of the eyepiece, only the focal length of the telescope. These numbers are telling you how much Barlow increase the focal amount of the telescope. I hope you already know what eyepiece is but just in case, i want to clarify it. The eyepiece or ocular is an optical instrument that’s attached to the focuser of the telescope. Without the eyepiece, you can’t use a telescope(well, you can if you are using a camera, but that’s another topic).