SVBONY SV152 20mm SWA Illuminated eyepiece review

SVBONY SV152 20mm SWA Illuminated eyepiece
SVBONY SV152 20mm SWA Illuminated eyepiece

I received an SV152 20mm 70 Degree SWA Illuminated Eyepiece (SKU: W9115A) for testing.
The manufacturer positions this eyepiece for the following applications:
-setting the exact alignment of the telescope and finder
-polar alignment (by drift method)
an invaluable aid to centering guide stars and astrophotography target objects
-the perfect eyepiece for alignment of computerized GoTo systems

Declared characteristics:
Field of view 70 degrees
Focal length 20 mm
Eye relief 16 мм
Crosshair – laser engraved
Lens group – 4 Group / 5PCS
Power – 2PCS 1.5V (AG5)
Lens Coated – FMC .
Field Stop – 25 mm
Thread – M28.5*0.6
Net Weight – 221g/ 7.8oz
Dimension – 75*53*102 mm


Measured parameters:
Field of view  70 degrees
Eye relief – about 16 mm
Ocular lens diameter  – 26 mm (flat), 2.5 mm deepened relative to the body.
Field Stop – 25 mm
Package weight – 318 grams
Eyepiece weight with caps (without illumination) 197.5 grams
With illumination module – 220 grams.
Eyepiece length (with caps) – 85 mm
Eyepiece diameter – 53.5 mm
Eyepiece width (with illumination module) – 102 mm
Eyepiece skirt diameter – 31.8 mm
Filter thread diameter – 28 mm.
Eyepiece scheme – possible Erfle.

The eyepiece is delivered in a dense cardboard box. Inside the box there is an eyepiece, two protective covers, a plug in the side, a illumination module, batteries and a cleaning cloth. Everything is packed neatly in bags, no damage or defects.

SVBONY SV152 eyepiece box
SVBONY SV152 eyepiece box
Inside the box
Inside the box
SVBONY SV152 eyepiece set
SVBONY SV152 eyepiece set

The eyepiece body is completely metal anodized, except for protective caps and ribbed rubber strip. The illumination module is also made of metal.

The eyepiece skirt is made with a groove and thread for a filter. I tried to install the eyepiece in several telescopes and zenith mirror (Sky-Watcher BKP150750, Sky-Watcher Mak 90, Sky-Watcher 1.25″ diagonal mirror, 50 mm finder-guider) – the eyepiece was installed without friction or jamming, with a small margin. Filters 1.25″ wrapped around a skirt flawlessly. The eyepiece is blackened inside.

Eyepiece skirt SVBONY SV152
Eyepiece skirt SVBONY SV152

It is also possible to adjust the eyepiece for vision (by rotating the body). Refocusing is smooth, without jamming. The correction range is approximately -2 to +4 diopters.

The eyecup is soft rubber, you can roll it up or take it off. The eye relief is insufficient for observation with glasses even with the eyecup removed – another 3-4 mm is missing. The eyepiece can also be used with glasses, but then the edges of the field of view will not be visible, but the crosshair itself is visible with a large margin. For an observer without glasses, the eye relief is comfortable. It is necessary to accurately center the eye, otherwise additional aberrations will appear.

Ocular lens eyepiece SVBONY SV152
Ocular lens eyepiece SVBONY SV152

All lenses are coated. The color of coating is green, blue, lilac.
The glass plate with the crosshair is coated only from the inside (green flare), from the side of the skirt a bright colorless flare is visible. Considering that the outer side of the plate requires periodic cleaning from dust, I think this decision is justified.

Ocular lens eyepiece SVBONY SV152
Ocular lens eyepiece SVBONY SV152
Eyepiece Crosshair SVBONY SV152
Eyepiece Crosshair SVBONY SV152

The light source is a red LED. There were no problems with the assembly, everything is quite obvious – the illumination module spins up, two batteries are installed in it. Then you need to remove the rubber plug from the side of the eyepiece and screw in the illumination module. Turning the knob clockwise clicks and turns on the backlight. The brightness adjustment range is large. The crosshair is thin. The angular size of the crosshair is about 40 degrees. The plate with the crosshair is not removable, it is located just at the level of the backlight module.

Illumination module SVBONY SV152
Illumination module SVBONY SV152
Illumination module SVBONY SV152
Illumination module SVBONY SV152
Illumination module SVBONY SV152
Illumination module SVBONY SV152
Illumination module SVBONY SV152
Illumination module SVBONY SV152

Initially, the eyepiece was clean from the inside, however, during using, dust particles began to appear in the field of view (obviously from the side of the eyepiece skirt). To remove dust particles, I recommend using a clean microfiber cloth (for glasses) + an ear stick. The eyepiece skirt can be unscrewed for easier cleaning. Looking through the eyepiece at a light bulb or a light screen, I carefully removed all the dust. I do not recommend the complete cloth for cleaning the crosshairs or optics, as a lot of fluff has spilled out of it – only for cleaning the body. To prevent new dust from appearing on the plate, I recommend screwing a filter SVBONY 1.25” UV/IR Cut into the eyepiece skirt.

Illuminated eyepiece crosshair SVBONY SV152
Illuminated eyepiece crosshair SVBONY SV152

The SVBONY SV152 eyepiece can be used directly with the guide finder SVBONY SV106 – you will get an excellent illuminated finder..

50 mm finder-guider and SVBONY SV152 eyepiece
50 mm finder-guider and SVBONY SV152 eyepiece

When I tested with a 50 mm guider-finder (focal length 190 mm, f3.8) and a Jupiter-37A photolens (focal length 135 mm, f3.5) the eyepiece showed good image quality in about 60% of the field of view, then the image gradually degrades ( field curvature and lateral chromatic aberration). There is a slight pincushion distortion. The edge of the FOV is sharp with a thin blue border. When you stop the lens or use less fast optics (f10), the image quality improves slightly.

Video test with telescope Sky-Watcher BKP1145

Total impressions:
+ excellent mechanical and optical workmanship
+ large field of view as declared
+ wide range of backlight brightness adjustment
– insufficient eye relief for observation with glasses
– noticeable degradation in sharpness at the edge of the field of view

Despite the disadvantages, the SVBONY SV152 eyepiece is an excellent solution for making finder with illumination (factory or homemade), or for other tasks (for example, polar alignment by drift method).

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5 thoughts on “SVBONY SV152 20mm SWA Illuminated eyepiece review”

  1. Евгений

    Здравствуйте, Руслан!

    Спасибо за обзор, подскажите, насколько все-таки плох данный окуляр при использовании с упомянутым искателем SV106. Купил себе такой искатель ради большего поля зрения, до ~8° (в зависимости от окуляра) против 4.5° у стандартного искателя SW 8×50. Сейчас подбираю под него окуляр. Попробовал окуляр 20 mm из линейки UW66, продающейся под разными брендами – качество изображения в 50% от центра просто провальное, звезды превращаются в кляксы, появляется что-то на подобии огромной комы, хвостом наружу, все-таки данный окуляр не для светосильной оптики, и не годится даже для искателя. Сейчас пока использую супер плессл SW 25 мм – c ним картинка уже вполне нормальная, но маловато увеличение, хочется побольше, поэтому обдумываю, что взять в диапазоне фокусных 18-20 мм и с полем 65-70°. Среди кандидатов – SV152 (самое большое поле и есть перекрестие), Angeleyes SWA 19mm/64° (самая низкая цена), Sky Rover UFF 18/65°(самое лучшее качество изображения по обзорам), Sky Rover UWA 16/82° (самое большое увеличение, но плохое качество на зоне и на краю). Исходя из обзоров Эренста пока склоняюсь к Sky Rover UFF с его измеренными 18.4mm/67.6°. Но и SV152 тоже интересен – не нужно делать перекрестие и поле будет побольше, но не понятно насколько он плох или хорош по качеству картинки. Можете более подробно описать, что происходит с изображением звезды по мере удаления от центра поля зрения?

    Заранее спасибо!

    1. Здравствуйте, Евгений!
      У этого искателя кривизна поля неисправлена. Плюс он сам по себе светосильный, а со светосильными объективами\телескопами недорогие широкоугольники плохо работают (типа UW 66). Попробуйте Svbony Ultraflat 18 мм (он жу SkyRover), у него поле лучше исправлено. Но кривизна объектива всё равно будет неисправлена – для этого надо или отдельную линзу-полеспрямитель, или специальный окуляр для зрительных труб с обратной кривизной поля. Так что всё не так просто.

      Я думаю, что Sv152 вполне будет достаточно.

  2. Hello,
    thank you for the nice and detailed review. Question: is it intentional for the lower half of the device to have some play when not inserted in a telescope? On mine there is and I wonder if that is correct.
    Regards
    Marcus

    1. Hello. At the moment I can’t remember if this eyepiece had play. What part of the eyepiece is playing? Skirt? A thick ring with a backlight module? Upper part with eyecup?

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