Full Answer
Can I use an sr4mm eyepiece?
Most users that attempt to use an SR4mm eyepiece will find it of little practical use. Such eyepieces are provided with scopes only to allow the scope to claim a very high maximum magnification (many people just starting out associate "high magnification" with "high quality", a notion that is completely false).
Can I use a Tasco telescope with an sr4mm eyepiece?
Anyone who tries to use a Tasco telescope with an SR4mm eyepiece will need to have incredible patience and the ability to withstand signficant frustration! My personal recommendation: If you are looking at a telescope to buy and you see it comes with an H20, H12.5 and SR4mm eyepiece set, do not buy it!
What can you see with a 4mm eyepiece?
The Apertura 4mm Plossl eyepiece produces sharp, high magnification views of the Moon and planets, and, depending on the telescope, will also work great for double stars, planetary nebulae, and other deep sky objects. Like most Plossl eyepieces, the High Point 4mm has a 52º apparent field of view.
What does H mean on telescope lens?
These typically include the Huygens (marked with an "H") and Symmetric Ramsden (typically marked "SR"). These are common designs in entry level telescopes as they are inexpensive to make (however their performance is often not so good compared to the better Plossl design).
What can you see with a 25mm eyepiece?
25mm – 30.9mm Telescope Eyepieces: These are extended field eyepieces for longer focal length – good for large nebula and open clusters. For shorter focal length, they are fantastic for large objects such as the Orion nebula, views of the full lunar disc, large open clusters and more.
What is H20mm eyepiece?
H20mm Telescope Eyepiece Multi-coated 0.965. Application：Support all types of telescopes, reflector, refractor, to observe the star clusters, moon, sky, planets and other celestial bodies. 35 Degree Field of View：Wide viewing field with extra sharpness and long eye relief.
Which telescope lens is stronger 10mm or 20mm?
This means that a smaller number on an eyepiece gives a higher magnification. A 10mm eyepiece would provide twice as much magnification as a 20mm eyepiece.
Is 10mm or 25mm better for telescope?
The above formula dictates that a telescope eyepiece with a shorter focal length yields a higher magnification than an eyepiece with a longer focal length. For example, a 10mm eyepiece will always provide a higher magnification than a 25mm eyepiece.
Which eyepiece is best for viewing planets?
Ultra-short focal length (2-4mm) eyepieces provide very high power magnifications and are best for observing the planets and the moon on shorter focal length telescopes.
How many mm is a good telescope?
Aperture: A Telescope's Most Important Feature As a rule of thumb, your telescope should have at least 2.8 inches (70 mm) aperture — and preferably more. Dobsonian telescopes, which are reflectors with a simple mount, provide lots of aperture at relatively low cost.
What lens should I use to see Jupiter?
The Best Equipment for Viewing Jupiter. Any small telescope with an aperture of 60mm to 90mm will be able to reveal Jupiter's four brightest moons, as well as the planet's cloud belts and zones. Even an 8x42 binocular or 9x50 finderscope will easily reveal the four Galilean moons.
What is a Plossl eyepiece?
Steve says: "A Plössl eyepiece comprises four glass elements arranged as two back-to-back achromatic doublets; or, in other words, two pairs of two glass lenses. Advertisement. These eyepieces produce a 'standard apparent feld of view' of between 50° and 56° with most set at around 52°.
What is a Kellner eyepiece?
Kellner eyepieces are a 3-lens design. They are inexpensive and have fairly good image from low to medium power and are far superior to Huygenian or Ramsden design. The eye relief is better than the Huygenian and worse than the Ramsden eyepieces. The biggest problem of Kellner eyepieces was internal reflections.
What does a Barlow lens do?
A Barlow lens is an optical tube containing lens elements that diverge the light passing through them. Named after English physicist and mathematician Peter Barlow, Barlow lenses add a second lot of magnification to each of your eyepieces while maintaining the existing eye relief.
Principal-Kohoutec
When I was 16 a bought a fairly cheap Spectron 60mm refractor that had been sitting in a cuborad for about 8 years. Got it out the other day, alligned the finder scope and had some really good viweing the following evening (despite the moon). Saw the cloud belts and moons of Jupiter, looked at the Orion nebula and the double star Mizar.
Principal-Kohoutec
I would also like to add that I am more used to binoculars and am more or less a complete beginner with telescopes.
Gweedo
Magnification is found out by dividing the focal length of the telescope by the focal length of the eyepiece.
RichieP
A rough rule of thumb is that the maximum useful magnification for any given scope is the objective diameter in mm multiplied by two, so in your case 60mm * 2 = 120x. This is of course assuming good optics and atomspheric conditions (e.g. you rarely can go over 200x in the UK owing to our rotten damp climate!).
ronin
When I was 16 a bought a fairly cheap Spectron 60mm refractor that had been sitting in a cuborad for about 8 years. Got it out the other day, alligned the finder scope and had some really good viweing the following evening (despite the moon). Saw the cloud belts and moons of Jupiter, looked at the Orion nebula and the double star Mizar.
Principal-Kohoutec
Thanks for the advice guys. I definately notice that the image quality falls when I use the SR.4 but it still looks okay. Good for splitting double stars. Another thing I was wondering was that I was looking at Jupiter and I saw a point on light at the bottom of the planet. Would this be one of the moons? I thought they orbited on an even plane...
RichieP
A focal reducer acts like the reverse of a barlow lens. It will have the effect of reducing the scopes focal length,, hence reducing magnification for a given eyepiece and increasing the exit pupil.
