Product Detail
SV231 Fringe Killer Color Correction Filter 1.25/2inch for Lunar and Planetary Surfaces
- Correct chromatic aberration; SV231 telescope filter prevents unwanted color banding in the blue spectral range; minimizes blue wavelengths in out-of-focus areas;
- OD＞4; the higher the filter cut-off depth; the smaller the noise and the higher the imaging contrast;
- Full thread design; M48x0.75 specification; male thread; thread is not easy to wear; you can overlay other filter to use;
- AR anti-reflection coating design; transmittance exceeds 95%; improves the contrast and clarity of fast achromatic telescopes, ensures image quality and brightness; obtains more observable light;
- Good performance coating; telescope color correction filter has plasma-enhanced dielectric coatings result in hard; scratch-resistant and waterproof filters;
- 300-1200/NM wavelength; blocking light damage and eliminating blue and purple streaks.
SV231 1.25/2 inch Color Correction Filter
The color correction filter blocks defocused light in the blue spectrum, as well as in the red part of the spectrum (IR) above 700nm, usually seen in small achromat telescopes.
Correct Chromatic Aberration
Block Light Pollution and Reduce Noise
OD Optical Density > 4
UV and IR Cut
AR Coating
Double-sided Thread Design
Focus Photography of Digital Camera
Use With SV503 ED Telescope
It can be used well before the focal point of the optical system, without any loss of sharpness, as a single filter in front of a binocular for a focal projection with digital cameras.
Use With SV48P Telescope
Various Application Scenarios
The smaller details on craters of the Moon and planetary surfaces are so much more visible. The NIR is fully blocked up to 1150nm. Details on planets are shown much clearer when using CCD/CMOS-cameras.
Specifications
| Brand | SVBONY | SVBONY |
| Model | SV231 | SV231 |
| Filter Usage | Color Correction Filter | Color Correction Filter |
| Type of Filter | Bandpass | Bandpass |
| Size | 1.25" | 2" |
| Substrate Thickness | 1mm | 1mm |
| Clear Aperture | 26mm | 44mm |
| Wavelength Range | 300-1200nm | 300-1200nm |
| Blocking | >OD2 | >OD2 |
| Peak transmittance | >95% | >95% |
| Surface Quality | 60/40 | 60/40 |
| Surface parallelism | 1/2λ | 1/2λ |
| Thread | M28.5x0.6 | M48x0.75 |
| Single Thread | Yes | Yes |
| Net Weight | 4.2g /0.15oz | 9.9g /0.35oz |
Features
1.Hight Quality Coating: Plasma-enhanced dielectric coatings result in hard, scratch-resistant and waterproof filters.
2.The color correction filter blocks defocused light in the blue spectrum, as well as in the red part of the spectrum (IR) above 700nm, usually seen in small achromat telescopes.
3.The smaller details on craters of the Moon and planetary surfaces are so much more visible.
4.Can be used well before the focal point of the optical system, without any loss of sharpness, as a single filter in front of a binocular for a focal projection with digital cameras.
5.The NIR is fully blocked up to 1150nm. Details on planets are shown much clearer when using CCD/CMOS-cameras.
The filter looks well made and of good quality. I haven't tested it yet because it's been cloudy and rainy. It took like 3 weeks to arrive to Mexico, I think it is a reasonable time. I will be using it with my sv503 80ed
I am stricktly a visual observer with a year of experience. I live in bortle 6-7 skies. My refractors used were a 120 f8 and 102 f6.5 with starguider ed eyepieces viewing Jupiter. The 120 has an svbony 2" dielectric mirror diagonal. The 102 has a 1.25" svbony dielectric mirror diagonal. As a planetary oberver I knew what to expect from this equipment. Both have a noticeable amount of mostly purple chromatic abberation. I wasnt expecting this filter to make my refractors like an ED but to help relieve some false color, which it did. I held the filter over my eyepieces on each scope to compare. Both views showed minimal purple halo around the diameter of Jupiter. It was almost not noticeable in the 120. As with most of these color correction filters it seems to be a trade off. The filter did remove the purple fringe mostly but added a yellowish tint. I compared the yellow #8 and found the svbony color correction filter was more clear and wasnt as yellow as the #8. The svbony filter has a pinkish hue on the back so I decided to stack my moon and skygliw filter with the #8 yellow. The view was darker and removed detail i could see with just the color correction filter. I saw this filter for pre-order on the svbony website and knew at this price it was worth a try. I havent had a chance to use it on the moon yet. The purple fringe is my biggest issue and this f