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Specification
Brand : Askar
BulletPoint1 : Askar FRA500 has inherited the legacies of superior FRA- series designing. It boasts a quintuplet air-spaced APO optical structure, a “three plus two” Petzval lens combination. The front lens group consists of three lenses (including two pieces of ED glass) for excellent correction of aberrations.
BulletPoint2 : The group is composed of two lenses separated by small space which is able to provide fine sharpness across the whole image. You may barely detect any blurry star at the edge of the image. FRA500 supports an image circle of amazing 55mm, much larger than the standard 44mm full-frame image circle.
BulletPoint3 : Its special back-focus design frees users from calculating confusing back-focus distance or rummaging around for a proper spacer. What you need to focus on is just to make your target stay in focus.
BulletPoint4 : The total length of FRA500 is 452mm when the dew shield is stretched out and 410mm when contracted back. At the tail end of the astrograph locates a 3.5" massively-built focuser with dual-speed hand knobs (twin knobs for coarse adjustment and one 1:10 fine adjustment knob), which is of great use in real observation or astrophotography.
BulletPoint5 : The Askar FRA500 is 410mm long and weighs about 4kg , so it’s quite convenient for users to carry around or mount on an EQ mount. It’s particularly suitable for astronomy enthusiasts who frequently engage in long-distance trips or out-door astrophotography.
Color : white
CompatibleDevices : Camera, Smartphone, Mount
ExternallyAssignedProductIdentifier : 6975213905005
ExternallyAssignedProductIdentifier1 : 0850012770275
ExternallyAssignedProductIdentifier2 : 850012770275
EyePieceLensDescription : Barlow
FieldOfView : 1.2 degrees
Finderscope : Reflex
FocalLengthDescription : 500 millimeters
FocusType : Manual Focus
ItemName : Askar FRA500 astrograph Telescope,500mm,Aperture 90mm F5.6,Quintuplet air-Spaced APO,Refractor OTA for Deep Sky Astrophotography and Visual Astronomy
ItemPackageQuantity : 1
ItemTypeKeyword : refracting-telescopes
Manufacturer : Askar
Material1 : Brass
Material2 : leather
MinFocalLength : 90 millimeters
ModelNumber : FRA500
PartNumber : FRA500
PowerSourceType : Adapter
ProductDescription : Sharpstar Optics introduces Askar FRA500 astrograph, which is the youngest among the well-known FRA- family, to our customers. Compared with its siblings, the 500mm-focal-length refractor has an aperture size of 90mm (f/5.6), so Askar FRA500 can better fit into the scenarios of deep-sky imaging than Askar FRA400. Besides, its more lightweight and compact than Askar FRA600, which makes it a great choice for out-door observation or astrophotography.
ProductSiteLaunchDate : 2023-03-24T08:09:47.417Z
Size : Telescope
SupplierDeclaredDgHzRegulation : not_applicable
TelescopeMountDescription : Equatorial Mount
UnspscCode : 41111715
ZoomRatio : 80