оборудование

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

Пользователь: Star Hunter, дата: 2020-03-24
Категории: обзоры, оборудование, окуляры.
Просмотров (views): 600   Комментариев: 1

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)

Specs
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.
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Optolong L-eNhance filter review

Пользователь: Star Hunter, дата: 2019-12-10
Категории: обзоры, оборудование, фильтры.
Просмотров (views): 2,853   Комментариев: 18

Every year, the illumination from cities is becoming stronger and stronger, creating difficult conditions for shooting deepsky objects. However, progress does not stand still – various filters have appeared that make it possible to cut off spurious light. Narrow-band filters that allow only a specific wavelength (hydrogen H-alpha, oxygen OIII, sulfur SII) have been used by astrophotographers for a very long time and make it possible to capture gas nebulae even under the conditions of strongest exposure. The hero of today’s review is the Optolong L-eNhance filter, passing only the H-alpha, OIII and H-beta lines. In combination with a color camera, it allows you to get a full-color image at once with one frame. Optolong L-eNhance will be of interest primarily to owners of color cameras and aperture telescopes. I immediately warn that it is not suitable for shooting objects of stellar nature (galaxies, star clusters, dust nebulae).

График пропускания фильтра Optolong L-eNhance, заявленный производителем

Filter bandwidth declared by the manufacturer

Packaging, appearance
The filter is delivered in a cardboard box. Inside it is a transparent plastic box for storage and transportation. Filter weight 5.4 g, thread diameter 28.5 mm, filter thickness with thread 7 mm, without thread 5 mm, light diameter at the inlet and outlet – 26 mm.
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Sky-Watcher AZ-GTi mount on the Star Adventurer tripod review

Пользователь: Star Hunter, дата: 2019-11-30
Категории: обзоры, оборудование.
Просмотров (views): 4,443   Комментариев: 11

I recently became the owner of an interesting Sky-Watcher AZ-GTi mount on a Star Adventurer tripod. With a mount weight of only 1.3 kg, its maximum load capacity is 5 kg. The mount is equipped with dual encoders, that is, after alignment to the object, the mount can be rotated by hand, but the alignment will not be lost. The mount is controlled via Wi-Fi using the SynScan Pro application from a smartphone\ tablet (Android, iOS) or from Windows PC. You can connect a Synscan hardware remote control to the mount by pre-crimping the cable in a specific pinout. Sky-Watcher AZ-GTi is suitable for both beginners and advanced astronomy enthusiasts who need a multifunctional azimuth mount mount with built-in motors, Go-To, Wi-Fi and the ability to work in equatorial mode.

General
A mount is a device designed to guide a telescope tube to an object. In most cases, the mount is a part of the telescope between the tripod and the optical tube. In alt-azimuth mounts, aiming is carried out in azimuth and height (left-right, up-down), in equatorial mounts – in right ascension and declination. The azimuthal mount can be converted to the equatorial, by directing its axis of heights to the pole of the world. In this case, azimuth becomes right ascension, and latitude becomes declination. For tilting, a special device is usually used – the equatorial wedge. There are also motorized mounts with compensation for Earth rotation. In this case, the object does not escape from the field of view and it can be examined in detail, which is especially important in observations with high magnification.

Initially, the Sky-Watcher AZ-GTi mount was positioned by the manufacturer as azimuthal, but the developers released firmware for it with the addition of the equatorial mode, as well as the location of the mounting plate on the right (Firmware: AZGTi Mount, Right Arm, AZ / EQ Dual Mode). This significantly raised the interest in mounting among astrophotographers. You can update the firmware via Wi-Fi. Due to its small size, the mount can also be used as a mini-tracker.

The manufacturer himself warns that the mount was not intended for astrophotography, the updated firmware was made for advanced users, the efficiency in astrophotography is not guaranteed, and, as a rule, the user may encounter difficulties in obtaining the expected result.
An important difference from the Sky-Watcher AZ-GTe mount is the presence of double encoders and the ability to rotate hands with weakened axle frictions.
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