Svbony SV231 Color Correction Filter 1.25″ review

The Svbony company continues to delight astronomy lovers with a variety of accessories. I received an interesting filter for testing to  chromatism suppression – Svbony SV231 Color Correction Filter 1.25″.

Svbony SV231
Svbony SV231

Chromatism in an achromatic lens telescope is a aberration that appears as a blue or purple halo around bright objects (planets, moon, stars). Chromatism appears due to the inability of an achromatic telescope to bring all rays in the visible range into focus – usually only red and green rays are brought together. This is especially actual for fast (f5-f6) achromats. Some people, unknowingly, even consider these halos to be the “atmosphere” of stars or planets. In ED telescopes and apochromats, chromatism can be significantly reduced or even completely eliminated compared to conventional achromatic telescopes. However, the cost of ED refractors and apochromats is significantly higher than that of achromats. I would also like to add that people’s tolerance for chromaticism may vary. Some people don’t see chromatism at all, for others it doesn’t bother them, and for others it irritates them. In my opinion, an age factor may also play a role here, since with age the lens in the eye turns yellow and acts as a kind of light filter. Moreover, a person can get used to the yellow image, and thus not notice the chromatism. My left eye is a little yellowish. But children and teenagers are great at noticing chromatic halos thanks to the young transparent lens.

Characteristics declared by the manufacturer:

Baader Solar Continuum 10 nm filter review

Since approximately July 2017, I have been the owner of a special filter for observing and photographing the Sun – Baader Solar Continuum 1.25″. This is an interference filter that transmits part of the spectrum in the green region at a wavelength of 540 nanometers and a half-bandwidth of 10 nanometers. It is now on sale no, and it was replaced in 2022 by an updated version with a narrower band (7.5 nm) and IR blocking.
The filter housing has an M28.5 thread, both external and internal. The filter is small and the thread height is small, so be careful not to drop it when unscrewing it from the eyepiece, T-adapter, or other filter.

Antlia CaK 3nm 393.3nm filter review

The Sun is the only star where amateur telescopes can be used to view or photograph details in the stellar atmosphere. In 1814, the German physicist, optician, and inventor Joseph Fraunhofer first observed lines in the spectrum of the Sun and assigned a nomenclature to the most noticeable lines. Some of his notations are still used today. There are special telescopes and light filters with which you can photograph the Sun in various spectral ranges. I decided to purchase one of these filters for photographing the Sun in the calcium line (CaK, or K-line) – Antlia CaK 3nm 393.3nm 1.25″.


2. Antlia CaK 3nm 393.3nm light filter cannot be used without first filtering sunlight, otherwise you can damage the filter and camera! It is necessary to use an aperture filter (I recommend Baader AstroSolar Photo ND 3.8), or a Herschel wedge + an additional ND filter.

The filter is available only in a 1.25″ form factor, which is quite enough for shooting the Sun with most lunar and planetary astronomical cameras. The filter is supplied in a very impractical magnetic box that tends to open up.

Обзор бинокля Pentax SP 20×60 WP

Бинокли формата 20х60 весьма специфичны, так как значительное увеличение требует обязательного использования штатива или упора. Тем не менее, они представляют собой огромный интерес для астрономии и наблюдения за животными, так как сочетают большую кратность, компактность и небольшой вес. Компания Пентар любезно предоставила мне бинокль Pentax SP 20×60 WP для тестирования.

Pentax SP 20x60 WP
Pentax SP 20×60 WP

Заявлено полное многослойное просветление, призмы BaK4, асферические линзы в окулярах, гидрофобное покрытие линз, заполнение азотом.

Обзор телескопа Sky-Watcher BK MAK102AZGT SynScan GOTO

Sky-Watcher BK MAK102AZGT SynScan GOTO — это зеркально-линзовый телескоп, выполненный по схеме Максутова-Кассегрена. Управление телескопом осуществляется при помощи пульта из комплекта поставки. Монтировка телескопа оснащена системой автоматического наведения и слежения за объектом, что позволяет значительно сэкономить время при поиске объекта, а также использовать телескоп для лунно-планетной съёмки. Апертура телескопа — 102 миллиметра, фокусное расстояние — 1300 миллиметров.

Телескоп Sky-Watcher BK MAK102AZGT SynScan GOTO
Телескоп Sky-Watcher BK MAK102AZGT SynScan GOTO

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