Nikon Z Full Frame ILDC Clip-in Filters

1.  L-Pro Filter Introduction
In suburban areas with weak light pollution, the color balance is good. The design of multi-band pass ensures excellent color restoration. L-Pro is a low color cast filter, which specially designed for starry sky photography. That is not possible with other light pollution filters

Optolong L-Pro (L-Professional) filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings including mercury vapor lamps, both high & low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow). Together with the highly transparent in main nebula emission lines at OIII(496nm and 500nm), H-beta (486nm), NII(654nm and 658nm), H-alpha(656nm) as well as SII(672nm), the filter is suitable for enhancing the contrast and details for both visual and photograghic purpose at sub-rural area with heavy light pollution.
Unlike other light pollution filter UHC and CLS, L-Pro is multi-bandpass filter which offers better color balance by maximizing the transmission band. The balanced transmission allows astrophotos to be taken with minimal color cast to broadband emission objects such as galaxies, reflection nebulae and globular star clusters. L-Pro is the best choice for light pollution suppression.

Main Use and Performance

Suitable for visual observation and astrophotography.

L-Pro filter has a very low transmission reduction rate against continuous spectrum space objects, and thus is quite effective in suppressing light pollution sources when shooting galaxies, reflection nebulae and globular star clusters. The same holds true for visual star observations.

L-Pro filter alone can suppress infrared wavelength, and thus can be used at ease for “L” image shootings with CCDs.Light pollution filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.

WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning.

L-Pro Spectrum and Characteristic

According to the relatively light pollution in suburbs, the image does not produce obvious color deviation phenomenon. The multi-band spectrum is specially designed and optimized as shown in the figure below.
Peak transmittance:  T>90%
Blocking range: 380nm-750nm
Blcoking depth: light pollution  line blocking >90%
Surface quality: 60/40(Refer to MIL-O-13830)
Transmitted Wavefront RMS: λ/4
 Parallelism: 30s

How to read the chart?

▲The horizontal axis is the Wavelength in Nanometers(nm).

▲The vertical axis is transmission in %.

▲The RED line shows the transmission line of L-Pro filter. The artifical emission lines are shown in ORANGE. And the emission lines from constellation are shown in GREEN.

2. Clear Sky Filter Introduction

Optolong Clear Sky filter effectively blocks out the influence of city Na lamp and Hg mercury lamp. It would not only improve contrast, but would cause better color reduction as well. Suitable for light pollution environment or bortle scale level1 to level 4. It can also shoot city night scene. It belongs to a type of light pollution filter.

3.  L-eXtreme Filter Introduction

Optolong L-eXtreme is a two 7nm bandpass filter which can be used with one-shot color cameras like DSLR's (digital SLR), and monochrome CCD cameras, it is also more suited for fast systems. The convenience and cost effectiveness of this filter allows amateurs to image a rich emission nebulas, even in bright, light pollution skies. Optolong believes the design of L-eXtreme filter would be better choice for fast systems in competitive price. It isolates the H-Alpha, and Oxygen III nebula emission lines so that the contrast and signal-to-noise ratio between nebulae were maximized. For people who is living in very light polluted areas, or when the moon is out, the L-eXtreme will be a good filter. The L-eXtreme filter is dual band that passes Ha and OIII emission lines.The advantage of the L-eXtreme filter is that there is no transmission between the H-beta and OIII lines, as there is no nebula emission lines there. In this case, it isn't letting light pollution come through so that maximize nebulas signal and make the sky background darker while imaging. The L-eXtreme filter should better isolate the emission lines only and better protect from light pollution. Hydrogen is the largest, the most primitive, the simplest, and the oldest element in the universe. Scientists consider that Hydrogen amounts to more than 90% of visible substance in space. Our sun is 5 billion years old, but so far hydrogen is still the key matter of nuclear fusion. While the sulfur element does not have much scientific significance, so keeping H and O is meaning for exploration of life. Therefore, we highlight H-a, H-b, O3 and O2, and reduce the signal of sulfur.

Spectrum and Characteristic
Sbustrate: B270
Thickness: 1.85mm
Tpeak:  T>90%
Blocking range: 300-1000nm
Blcoking depth: light pollution  line blocking >99%
Surface quality: 60/40
Transmitted Wavefront RMS: λ/4
 Parallelism: 30s

※This curve is only for reference, and is not used as the final product data.

4.  Camera Compatible Table

Tips:Due to limited lens resources, the test will focus on popular lenses. If you have other lens application information, please contact Optolong customer service personnel.

We are very grateful for your valuable test data.

Because of the specialty of the mirrorless optical path and diaphragm design, as well as the reason of the incident angle of light, there may be slight vignetting interference when using an interference filter for shooting. L-Pro/L-eXtreme is recommended to be used with a focal length of 50mm or above, and if using a wide-angle lens, the interference edge needs to be cropped.

5. Installation and Removing Instructions

6. More Explanation of NK-Z Clip-in Filter

Because of the specialty of the mirrorless optical path and diaphragm design, as well as the reason of the incident angle of light, there may be slight vignetting interference when using an interference filter for shooting.

L-Pro/L-eXtreme is recommended to be used with a focal length of 50mm or above, and if using a wide-angle lens, the interference edge needs to be cropped.

7. Coating Technology

·Multi-layers anti-reflection coating

·Non-cementing optical substrate coating

·Optolong L-Pro filter adopts precision coating based on Ion-assisted deposition coating technology for durability and resistance to scratching, as well as stability on CWL(central wavelength) no deviation affected by temperature change.

·Planetary rotation system offers precision and homogeneity of coatings ensuring high value on transmission of pass-band and Optical density of off-band.

8. Gloable Price

9. Packing

Outer Box: silve box

Plastic Box: PP material

Lining: imported high pressure white EVA material

10. Imaging Target and Working Environment

Bortle Scale

11. NK-Z Clip-in Filters Performance

I Comparason image was shot by Arnaud Besancon

All the pictures have been realised with 5D3 Astrodon modded and Samyang 24mm F1,4 at F2, 13s exp. time,3600 isos.

All the pictures are raw,without post-process

.

II Panoramic view imaged by Jakob Sahner

Panoramic view of the Black Forest in southern Germany, taken at a focal length of 28mm. The Milky Way looks very pretty tonight, and we may even see some green air glow.

Equipment Camera: Nikon z6 Mod

Lens: Sigma 28-45 f1.8 (adapted with a megadap Sony-E to Nikon-Z mount)

Filter: Optolong L-Pro NK-Z filter

Acquisition Details Ground: 30seconds f3.2 ISO1600 Sky: 4x30seconds f1.8 ISO1600

Credit: Jakob Sahner

III Probably the most colorful and beautiful corner of our galaxy .., imaged by Mehmet Ergün

This is a panorama of three images showing the constellations rising in the east. The image highlights all the visible constellations.

Equipment

Camera: Nikon z6 Mod

Lens: Sigma 28-45 f1.8 (adapted with a megadap Sony-E to Nikon-Z mount)

Filter: Optolong L-Pro NK-Z filter

Acquisition Details

Ground: 4x120seconds f3.2 ISO800

Sky: 8x30seconds f1.8

Credit: Jakob Sahner

... STAY TUNED ... 

Warm prompt

●When using NK-FF /EOS-FF clip-in filters, the lifting of the reflector will affect the optical viewfinder window (OVF), so you have to use Live View mode for shooting.

●Due to the different lens optical design of different manufacturers, part use of fisheye lens, ultra wide Angle lens and wide Angle lens may lead to image fuzzy at around. It is normal. Or you can choose L-Pro UT, the ultra-thin model to solve this problem.

●Some entry-level models may fail to focus when using optical viewfinder (OVF) due to different focusing system designs. Using Live View(real-time display) mode for shooting will be recommended.

●Pls DO NOT shoot directly at a strong light source, because that may produce secondary reflection and lead to the degradation of image quality.

●When removing the clip-in filter, please place the camera flat and face up to avoid the filter touching the rear of the lens.

-About color: due to the influence of ambient light, color difference of the display and flash photography, the color of the product may have some color difference. Detailed color is in accordana with the final product.

-About coating: the interference filter will show different colors under different light, which is a normal phenomenon. Please refer to the material object.

-About the style: in order to improve the product, the change of design/appearance/parameters has not been updated in time. Please see the subject produce.

-About the description: the series of this product have the same material, technology and design, different sizes only, please note.

Nikon Z Full Frame ILDC Clip-in Filters type

Filters Type: L-Pro, L-eXtreme, Clear Sky

Applicable camera body: Z5 / Z6 / Z6II / Z7 / Z7II / Z8 / Z9 / ZF

Applicable Lenses: 1>All Z series Lens can be used 

2>All F seres main and suxiliary lens can be used(connector shall be needed)