Apochromatický refraktor William Optics 51/250 SpaceCat 51 OTA - span class=redPouze tubus s příslušenstvím, bez montáže, bez stativu/span ★ Astro obchod

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Apochromatický refraktor William Optics 51/250 SpaceCat 51 OTA - Pouze tubus s příslušenstvím, bez montáže, bez stativu

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Optics
Type	Refractor
Type of build	Apochromat Quadruplet
Aperture (mm)	51
Focal length (mm)	250
Aperture ratio (f/)	4,9
Resolving capacity	2,71
Limit value (mag)	10,3
Light gathering capacity	50
Max. useful magnification	102
Tube weight (kg)	1,5
Tube length (mm)	225
Tube material	Aluminium
Coating	multiple
Tube construction	Full tube
Focuser
Tilting Adaptor	yes
Type of build	Helical
Connecting threaded socket (camera-side)	M48
Backfocus (mm)	59,7
Free aperture (mm)	44
Rotating	yes
Mount
Type of build	OTA
Mounting type	no mount
Included accessories
Dew Shield	yes
Carrying bag	yes
Miscellaneous	Bahtinov focus mask
Prism rail	Arca-Swiss & Vixen-Style
Corrector	integrated
General
Series	Cat
Colour	silver
Area of application
Astrophotography	yes (very good)
Moon & Planets	yes
Nature Observation	yes
Nebulae & galaxies	yes
Sun	no (Only with appropriate Sun filter)
recommended for
Beginners	no
Advanced	yes
Observatories	no