equipment

QHY5III462C camera review

I have been using specialized astronomical cameras for more than 10 years now and keep an eye on new matrices. During this time, sensors with small pixels, low noise and different diagonals appeared. One of the significant breakthroughs occurred in 2014 with the advent of the Sony IMX224 color sensor, which is characterized by very low read noise and high sensitivity to near-infrared radiation. Moreover, in the visible range, this sensor operates in color mode, and in the near-infrared range, color microfilters “leak” and at a wavelength of 850 nm or more, the matrix begins to operate in full monochrome mode.

How to choose a Barlow lens?

A Barlow lens is an optical accessory that increases the focal length of a telescope. The Barlow lens is mounted on a focuser, visual back, or diagonal mirror. It can be used for both visual observations and astrophotography. The main photographic application is photographing planets, the Moon, the Sun, double stars, and in some cases, photographing small planetary nebulae.
A Barlow lens looks like a tube with glass in the front. It consists of a lens cell (lens in a metal frame), as well as a housing with a clamping screw.

Lacerta Herschel wedge 1.25″ review

Клин Гершеля Lacerta 1.25
Lacerta Herschel wedge 1.25″

The Herschel wedge is a special optical accessory designed for safe observation and capturing of the Sun through a telescope in conjunction with additional neutral density filters. The principle of operation of this device is very simple – sunlight focused by a telescope is partially reflected from a glass wedge, further attenuated using several light filters and then enters the eye or camera, but most of the solar energy passes through the wedge and hits the radiator. That is, an aperture filter is not used – only a Herschel wedge and additional sub-aperture protective filters. This device was first proposed and used around 1830 by astronomer John Herschel (son of William Herschel). Instead of a wedge, a 90° prism or a more complex design can also be used.
What can you see through the Herschel wedge?
Using a Herschel wedge, you can observe and photograph sunspots, flare fields, and granulation. Prominences are not visible – to observe them you need a special chromospheric telescope or a chromospheric attachment.

The Sun observed through the Herschel wedge in white light and with Baader Solar Continuum filter(540 nm)
The Sun observed through the Herschel wedge in white light and with Baader Solar Continuum filter(540 nm)

Of course, when observing the Sun, you should be careful and be extremely attentive, since if you make a mistake, you can instantly damage your vision or equipment. Considering that light falls on the Herschel wedge without preliminary filtering, the Herschel wedge can ONLY be used with lens telescopes, since overheating and damage to the secondary/diagonal mirror and hood are possible in mirror and mirror-lens telescopes. Yes, there is a Triband-SCT mirror-lens telescope with a full-aperture three-band filter for use with a Herschel wedge, but this is the exception to the rule.

ZWO ASI183MC astronomical camera

The ZWO ASI183MC is a dedicated camera originally designed for photographing celestial objects. It does not have built-in memory, like household cameras, and information from the camera is recorded on a computer using a USB cable. The videos are quite voluminous; a minute of video in full resolution at the maximum frame rate can take 20-21 gigabytes. To successfully record videos with this camera, you need a computer with a USB 3.0 bus and a fast SSD drive.

ZWO ASI183MC

The ZWO ASI183MC camera is made in a “puck” form factor. The camera is lightweight, the body is completely metal. There is a 1/4-inch hole in the back (for example, for mounting on a photo tripod). Color sensor – Sony imx183. Shooting resolution 5496×3672 (20.18 megapixels). A 12-bit digital-to-analog converter is declared, a maximum frame rate of 19 fps in full resolution at 8 bits, a small pixel of 2.4 micrometers, a high-speed USB 3.0 bus, an autoguider port. The front sensor is covered with coated protective glass without IR-cut coating, so an additional IR-cut filter is necessary to obtain adequate color balance. Connection to the telescope is carried out using the included 1.25″ T-adapter, or using a T2 thread, or by directly installing the front black metal ring into a 2-inch focuser, or through third-party adapters.

Обзор бинокля Pentax SD 7×42 ED

Мне удалось протестировать бинокль с весьма редкой формулой – Pentax SD 7×42 ED, где 7х – кратность, а 42 – диаметр объективов. Бинокли с формулой 8х42  более распространённые, однако у формата 7х42 есть потенциально свои плюсы – лучшая стабильность изображения за счёт меньшей кратности, а также более яркое изображение по сравнению с 8х42 биноклем.

Pentax SD 7x42 ED
Pentax SD 7×42 ED

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