SV230 Super Zoom Aspheric Eyepiece Clickstop Parfocal Design 8-20mm 57°- 72° AFOV for Astronomical Observation with 1¼" / 2" Nosepieces

Clickstop Click Design

Panoramic Wide Angle

The 57°-72°panoramic wide angle provides you with the ultimate observation comfort. The field of view of each focal point is calculated using optical design software, which is really effective. The customer's intuition may feel that the field of view will be larger.

Dual Interfaces

Equipped with 1.25" and 2" interfaces. It is suitable for multiple telescopes.

Support Astigmatic Corrector

Zoom eyepiece with astigmatic corrector provides you a better visual experience. The rubber eyecup on the eyepiece can be removed. It has M43 T-mount underneath, which can be connected via an M43-T adapter(not included).

Aspherical Lens

Double-sided aspherical glass lenses is designed to eliminate edge distortion, it has resolved the persistent issue of subpar edge image quality associated with wide-angle eyepieces, thereby transcending the visual constraints experienced by users.

Parfocalization

Parfocal across the entire zoom range.There is almost no need to refocus when changing magnification.

Fully Multi-Coated Coatings are a great help for increasing the glass's light transmission and transparency, combined with the 6 groups and 9 elements construction to provide a clearer image.

Edge Extinction

This design can absorb unwanted light when observing objects, reduce the effects of light pollution.

Continuous focal length zoom of 8mm to 20 mm for a wide range of magnification without the need to switch eyepieces.

Long eye relief of 17 mm for comfortable viewing position, even for eyeglass wearers.

Rubber Eye-cup

The adjustable rubber eye-cup is comfortable for viewing with or without spectacles.

• Brand	SVBONY	SVBONY	SVBONY
  Model	SV245	SV230	SV215
  Focal Length	8mm-16mm/0.31-0.63"	8mm-20mm	3-8mm
  Apparent Field of View	63°	57°- 72°	56°
  Barrel Size	1.25" & 2"	1.25" & 2"	1.25"
  Coatings	Fully multi-coated	Fully multi-coated	Fully multi-coated
  Blackened Lens Edges	Yes	Yes	Yes
  Eye Relief	18-17mm/0.71-0.67"	17-19mm	10mm
  Parfocal	Yes	Yes	Yes
  Rubber Eye Guard	Yes	Yes	Yes
  Clickstop Click Design	Yes	Yes	Yes
  Dioptrix Mounting	Support	Support	No
  Material of Barrel	Stainless steel-1.25" & Aluminum Alloy-2"	Stainless steel	Stainless steel
  Filter Threads	M28.5x0.6 & M48x0.75	M28.5x0.6 & M48x0.75	M28.5x0.6
  Groups/Elements	5/8	6/9	4/6
  Outer Diameter	60mm/2.36"	60mm
  Net Weight	486g/17.17oz	500g/17.66oz
  Size	129*60mm/5.08*2.36"

Feature

1.Universal use during the day and in the night, sky support excellent resolution and contrast values as well as a sharp image at a large apparent field of view.
2.Parfocal across the entire zoom range. There is almost no need to refocus when changing magnification. 
3.The wide focal length range allows the use on very many instruments, whether on a compact APO, DOB or fast Newtonian telescopes.
4.Nine Element (include Aspheric), multi-coated optics for remarkable sharpness, contrast and colour correction.
5.Smooth zoom action with click-stops at 8, 9,10,11,12,13,14,15,16,17,18, 19 and 24mm.
6.Wide 72 degrees AFOV at 8mm, 57 degrees at 20mm.
7.17-19mm eye-relief and adjustable rubber eye-cup for comfortable viewing with or without spectacles. The maximum Ø of 60mm also allows the use on a binocular attachment.
8.Includes both 1.25” and 2" barrels - threaded for filters.