Product description
The ED 100Sf is now available with Vixen's Dual Speed Focuser. Vixen's apochromatic refractor has an extra-low dispersion (ED) lens which depresses residual aberration to achieve a high level of performance. Coupled with a medium f/9.0 focal ratio, the ED "S" series provides sharp, high contrast color-free images. For the astronomer that wants the best value for the dollar in a 4” APO, this is the one to get.
It not only matters which telescope you buy but also where you buy it. Our additional services:
- We are a leading telescope dealer and know the devices we sell. Our customer service team will gladly help you after your purchase if you have problems with assembly or operation.
- We provide a copy of the 80-page Telescope ABC beginners handbook with every telescope.
- We also provide an edition of the exciting astronomy magazine, “Sterne und Weltraum” with each telescope.
Specifications
Optics
Optics
A telescope tube is referred to as an optic because it contains the components necessary to collect and concentrate light.
Type
Type
There are basically two different types of telescope. A distinction is made between refractor (lens) and reflector (mirror) telescopes.
Refractor
Aperture(mm)
Aperture
The aperture indicates the diameter of the objective lens or the mirror.
100
Focal length(mm)
Focal length
This is the distance between the objective lens or mirror and the focal point.
900
Aperture ratio(f/)
Aperture ratio
Is the ratio of the aperture to the focal length of a telescope.
9
Resolving capacity
Resolving capacity
The ability of the optic to discern the fine detail of objects that are close together.
1,15
Limit value(mag)
Limit value
Describes the brightness of a star or point-shaped object, which can still just be distinguished by the telescope. The naked eye, for example, can make out stars with a magnitude of up to 6.
11,8
Light gathering capacity
Light gathering capacity
Light-gathering capacity of the telescope compared to the eye.
200
Max. useful magnification
Max. useful magnification
The telescope’s magnification should not exceed this factor, because otherwise the image will appear weak and dark.
200
Tube weight(kg)
Tube weight
The weight of the tube is critical for the correct choice of mount.
4,1
Focuser
Focuser
A focuser is used to hold an eyepiece. The image can be focussed using the focus wheels on the side.
Type of build
Type of build
There are basically two different construction types: the rack and pinion focuser and the Crayford focuser.
Gear rack
Connection ( to eyepiece)
Connection ( to eyepiece)
Focusers are available in 1.25" or 2" formats. Many 2" focusers also have a 1.25" adapter.
2
Mount
Mount
A mount is the foundation of an astronomical telescope. It usually consists of the mount head and an appropriate tripod.
Mounting type
Mounting type
Are mainly differentiated between equatorial and altazimuth. A special type of altazimuth mount is the Dobsonian mount.
no mount
GoTo control
GoTo control
Object positioning system, available in real GoTo and also PushTo versions.
no
Type of build
Type of build
Describes the exact construction of the particular mount and thereby further subdivides the different types of mount.
OTA
OTA
An OTA is an optical tube without a mount. It is short for optical tube assembly.
Included accessories
Included accessories
Many telescopes came with simple accessories.
Finder scope
Finder scope
A mini telescope used to locate a celestial object. There are optical finders and red dot finders.
9x50
Miscellaneous
Relevable mirror unit
General
Series
Other
Area of application
Area of application
The area of application will give you a broad overview of the purposes for which the telescope is suited.
Moon & Planets
yes
Nebulae & galaxies
yes
Nature Observation
yes
Astrophotography
yes
Sun
Sun
Telescopes for safe solar observing.
not recommended(Only with appropriate Sun filter)
Recommended for
Recommended for...
The classification of the telescopes according to their suitability for beginners, advanced or observatories is useful as an initial orientation.
Beginners
Beginners
Telescopes that are supplied as a complete system and are easy to operate.
no
Advanced
Advanced
Telescopes for experienced observers, but also for ambitious beginners.
yes
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