Shop
Magazine
%SALE%
EN / $
Language
Deutsch
English
Français
Polski
Româna
Italiano
Español
Português
Nederlands
Svenska
Currency
BGN - лв
BRL - R$
CAD - $
CHF - SFr
CZK - Kč
DKK - dkr
EUR - €
GBP - £
HUF - Ft
MXN - $
NOK - nkr
PLN - zł
RON - Lei
SEK - Skr
TRY - ₺
USD - $
✓
The brand for astronomy & observing nature
✓
Wide range of innovative products
✓
In-house development & manufacturing
✓
Personal service & support
Telescopes
Telescope accessories
Universe2Go
Astro T-Shirts
Binoculars
Spotting scopes
Photo Tripods
Microscopy
% SALE %
Glossary
Telescopes
Optics
Aperture
Aperture ratio
Bandwidth
Blocking Filter
Coating
Corrected Field
Double Stack
Focal length
Lens design
Light gathering capacity
Limit value
Max. useful magnification
Resolving capacity
Tube construction
Tube length
Tube material
Tube weight
Type
Type of build
Glossary
>
Telescopes
>
Optics
> Limit value
Glossary | Telescopes | Optics | 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.