Optolong L-eNhance filter review

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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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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Forester 8x42ED binoculars with Taobao came to my test. The binoculars are rare – there are no reviews, no tests.  Stated full multi coating, dielectric coating of prisms and ED-glass in the lenses.

Forester 8x42ED

Forester 8x42ED

Заявленные характеристики

Declared Specifications

Options, appearance, ergonomics
The binoculars come in blue cardboard packaging without any prints. There is a sticker with a QR code and the name of the binoculars. The set includes binoculars, a bag with a belt, a neck strap, lens caps, a double cap for eyepieces, a cloth for wiping optics and manual. The bag is made quite high quality. Our neck strap is wide, soft. The lens caps are held on the case of the binoculars – conveniently, they are not lost.
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