All posts by Star Hunter

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

Explore Scientific LER 52° 6,5 mm, 1,25″ (AR)

Item Number: EPWP5265–01
Type: parfocal
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) > > >

Explore Scientific O-III 1.25″ filter review

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

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) > > >

The Orion Nebula, March 13, 2020

Orion is still available for observation in the evenings. I decided to shoot the Orion Nebula with second shutter speeds with 127 mm Schmidt-Cassegrain. In total, 1200 frames turned out, of which I manually selected the 521 best frame and stacked it. The capturing was carried out on an azimuthal mount Sky-Watcher AZ-GTi, field rotation compensation occurred when two stars were stacked to Fitswork.

The Orion Nebula, March 13, 2020

The Orion Nebula, March 13, 2020

-telescope Celestron Omni XLT 127
-reducer Antares f\6.3
-filter Optolong L-eNhance 1.25″
-camera ZWO ASI 183MC
-mount Sky-Watcher AZ-GTi
Location: Russia, Anapa, backyard
Stacking 521 frames per 1 second with Fitswork, wavelets with Registax 6.

I also made bicolor, replacing the blue channel with green. Nevertheless, I like the original RGB version more, because the blue channel (H-beta) is still different from red (h-alpha) and green (O-III).
Читать далее (Read more) > > >