What is the focal length of Orion 50mm guide scope?
162mm focal
Consisting of a 50mm aperture, 162mm focal length (f/3.2) achromatic refractor guide scope, an adjustable dovetail guide scope bracket, an 1.25″ aluminum parfocal ring, a dovetail mounting base, and an adapter plate, the Orion Mini 50mm Guide Scope makes it easy for any astro-imager to enjoy the precision of …
How do you calculate the focal length of a telescope?
In most telescopes the focal length is roughly equal to the length of the tube. Some telescopes use extra lenses and/or mirrors to create a long effective focal length in a short tube.
How do you focus a guide scope?
Then we’ll lock the camera. In at that location. And then use the helical focuser for some fine adjustments. Now on my guide scope as well. The entire shaft here can actually slide in and out.
What is a good imaging guiding ratio?
Each pixel in a camera subtends some number of arc seconds per pixel when pointed at the sky. This number is a function of the pixel size of the camera and the focal length of the telescope. So, when you guide, you want to ratio of the two angles to be less than 5 to one at most.
What is the difference between a guide scope and a finder scope?
Small telescopes which are mounted parallel to the telescope fulfil two purposes: as a finderscope, they help the observer to navigate the night sky, whilst as a guidescope, they help with the astronomical mount’s precise tracking.
What is guide scope?
The guidescope is a small refractor or even a modified finderscope that is mounted along with the imaging telescope and camera and its job is to capture an image of a single star using its own small camera and then to analyse the movement of that star in the field of view using guiding software.
What is the formula of length of telescope?
Focal Ratio (f/stop)
For example, a telescope with a focal length of 1000mm and a 100mm (4″) clear aperture has a focal ratio of f/10 (1000/100=10). An example calculation of focal ratio and magnification for a scope with a 25 mm focal length, eyepiece, 102 mm aperture, and 900 mm focal length, telescope.
Is 400mm focal length good for telescope?
* 400mm (f/5.7) focal length and 70mm aperture, fully coated optical glass lens, with high transmission coating, can create stunning images and protect your eyes. The perfect telescope for astronomers to explore the stars and moon.
Is a guide scope necessary?
If the focal length of your imaging scope is 1500mm, then you need a guide scope with a focal length of at least 150mm to give sufficient resolution for effective autoguiding. This is not a hard and fast rule, but it is helpful to understand what focal length you need.
How big should my guide scope be?
To be on the safe side, you could take 1/5th the focal length of your main telescope as a soft rule of thumb. As an example, if you have a telescope that is 1500mm in focal length, you should select a guide scope with a focal length of at least 1500/5 = 300mm.
Why do you need a guide scope?
What is the best guide scope?
The Best Telescope Guide Scopes Reviewed
- SVBONY SV165 Mini Guide Scope.
- SVBONY SV106 Guide Scope.
- Astromania 50mm Compact Deluxe Finder & Guide Scope Kit.
- Orion 60mm Multi-Use Guide Scope.
- Astromania Camera Easy Autoguiding Set60.
- Solomark F60 60mm Guide Scope.
- Orion 30mm Ultra-Mini Guide Scope.
What is focal length of a telescope?
The focal length is also important. The FOCAL LENGTH is effectively the length of the telescope. It is measured as the distance from the main optic to the point where the image is formed. A short focal length will give a wide field of view but the objects in the field of view will appear small.
What is eyepiece focal length?
The focal length of an eyepiece is the distance from the principal plane of the eyepiece where parallel rays of light converge to a single point. When in use, the focal length of an eyepiece, combined with the focal length of the telescope or microscope objective, to which it is attached, determines the magnification.
What can I see with a 700mm focal length telescope?
With a 70mm telescope, you will easily be able to see every planet in the Solar System. You will also be able to take a great look at the Moon and clearly distinguish most of its recognizable features and craters.
What can I see with a 400mm focal length telescope?
With 400mm you could watch objects like:
- Andromeda galaxy core.
- Orion nebula, other large emission or reflective nebulae (e.g. Pleiades)
- large star clusters.
- low magnification lunar observations.
What is a good focal ratio?
Focal Ratio – Faster, Brighter, Smaller
A long focal ratio implies higher magnification and narrower field of view with a given eyepiece, which is great for observing the moon and planets and double stars. For such objects, a focal ratio of f/10 or more is ideal.
Is a 10mm or 20mm eyepiece more powerful?
Magnification is determined simply by dividing the focal length of the telescope by the focal length of the eyepiece. 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.
Which is more powerful 10mm or 25mm eyepiece?
For example, a 10mm eyepiece will always provide a higher magnification than a 25mm eyepiece. This relationship is important to remember while choosing eyepieces: the lower the eyepiece focal length, the higher the relative magnification will be.
Can you see Saturn’s rings with a 70mm telescope?
The colorful bands and belts of Jupiter, as well as its four major moons, and the rings of Saturn are clearly visible in a 70mm telescope.
What eyepiece is best for galaxies?
Plössl eyepieces are excellent for general use although their eye relief will diminish as the eyepiece’s focal length reduces. This design is most suitable for observing nebulae and star clusters. A 15mm and 25mm Plössl eyepiece would be good additions to your current line-up.
What is the best focal length for telescope?
A shorter focal length telescope will be more suited to wide field views of the stars. A good all round first telescope should have a focal length of around 1000mm to 1200mm. All refracting telescopes use a glass lens as their primary focusing unit.
What eyepiece is best for deep space?
Medium focal length (10-20mm) eyepieces provide medium power magnifications and are best for observing larger deep sky objects and the full disc of the moon on most average telescopes.
Can you see Jupiter with a 10mm lens?
In most cases you need two to three eyepieces of different powers, say a 25mm, 15mm and a 10mm and a barlow lens. A 2X barlow will double the power of an eyepiece practically turning a 25mm into a 12.5mm. If you have any filters, an 80A Blue seems to work fairly decent on Jupiter.
Can you see the moon with 10mm lens?
Almost all the time, the best eyepiece to use would be the 20 mm lens for seeing the moon. If you want a better view, then you can go for the 10mm.