I received an SV152 20mm 70 Degree SWA Illuminated Eyepiece (SKU: W9115A) for testing. The manufacturer positions this eyepiece for the following applications: -setting the exact alignment of the telescope and finder -polar alignment (by drift method) –an invaluable aid to centering guide stars and astrophotography target objects -the perfect eyepiece for alignment of computerized GoTo systems
Field of view 70 degrees
Focal length 20 mm
Eye relief 16 мм
Crosshair – laser engraved
Lens group – 4 Group / 5PCS
Power – 2PCS 1.5V (AG5)
Lens Coated – FMC .
Field Stop – 25 mm
Thread – M28.5*0.6
Net Weight – 221g/ 7.8oz
Dimension – 75*53*102 mm
The Explore Scientific 52 ° eyepiece line went on sale in mid-2018. It is represented by eyepieces with a focal length of 3, 4,5, 6,5, 10, 15, 20, 25, 30 and 40 mm.
In my opinion, the greatest interest for observing the planets and the moon is represented by the values of 3 mm, 4,5 mm and 6,5 mm – they are made according to the “negative doublet + Plossl” scheme.
Explore Scientific LER 52 ° 6,5 mm, 1.25 “(AR) eyepiece came to my test.
Explore Scientific LER 52° 6,5 mm, 1,25″ (AR)
Item Number: EPWP5265–01
Coatings: EMD (Enhanced Multi-Layer Deposition) on all lens-to-air surfaces
Lens elements/ groups: 6 Elements in 3 Groups; Edge Blackened
Field of view: 52° (measured – 51,2°)
Focal length: 6,5 mm
Eye relief: 15,9 mm (measured – 16 ±1 mm)
Field Stop Diameter: 5,9 mm
Barrel Size/Type: 1.25″ O.D. / Double Taper
Filter Thread Fits Standard 1.25-inch Dia. Thread in Filters (1.125-inches x 42 TPI) (measured thread diameter – 28 mm)
Waterproof O-Ring Sealed Argon Gas Purged; Tested Under 1 Meter of Water for 30 Minutes
Eyecup: Removable Flip-Down Style Soft Silicone Rubber
Materials: Optical Glass; Aluminum; Steel; Silicone Rubber
Length: 103.5mm (measured – 104 mm)
Width: 43 mm (measured – 43 mm)
Weight: 226,8 grams (measured – with protective covers 227 grams, withot protective covers 220,7 grams)
Markings: Laser Engraved: Focal Length; Series; Serial Number; Brand
Country of origin: China for Explore Scientific (Germany)
The eyepiece comes in a beautiful cardboard box. The kit includes an eyepiece, 2 plastic protective covers and a dustproof bag made of soft fabric. The eyepiece is packed reliably, you can not worry about its safety during shipment. Читать далее (Read more) > > >
The O-III light filter (read as “o-three”) is an astronomical accessory designed to improve the visibility of gas nebulae, namely planetary nebulae, supernova remnants and regions of active star formation. The O-III filter passes the green region of the spectrum around the doublet of the spectral lines of doubly ionized oxygen O2+ (or O III), highlighting these lines (495.9 and 500.7 nm) against a darker background of the rest of outer space. Perhaps this is one of the most useful filters for visual observation of nebulae.
Explore Scientific O-III 1.25″
The filter comes in a colored cardboard box with a magnetic lock. Inside the box there is a filter in a plastic box and a bag, sealing material, as well as a filter bandwidth graph. Читать далее (Read more) > > >