Astronomik L-2 UV-IR Block Clip-Filter Nikon XL
- Large filters for large camera lens objectives are very expensive
- If you are using an Off-Axis Guider stars will be dimmed on your autoguiding camera when a 2" round mounted filter is threaded to a corrector being ahead of the reflecting prism from the light path.
- For very fast (low f/ number) telescopes like the Vixen R200SS or the Takahashi “Epsilon” astrograph, a filter drawer or a filter wheel cannot be used since the distance to the corrector lenses would be changed.
- With long exposure times your camera’s sensor chip is exposed to more dust
With the Astronomik Clip-Filter System you can take care of all of these problems at once!
The filters are held in place save and secure with no stress to the high quality glass. The Clip-Filter are designed and optimized to be used with normal lenses and with telescopes as well.
Due to the very tight Nikon bayonet, the clip-filters add a minimal obstruction at the edge of the field.
Astronomik L-2 UV-IR Block Clip-Filter Nikon XL Full Frame
The Luminance channel is probably the most important for a great final image! You want as much signal as possible so the filter should have the highest transmission possible with a wide spectral bandpass. This combination provides the greatest sensitivity and gives you the highest photon counts on your pixels. While the high transmission level is a great aspect of the new Astronomik Luminance filters, not all optical instruments or additional optical elements like correctors, field-flatteners or reducers, have perfect colour correction so it can be the width of the spectral band pass of the Luminance filter that can cause problems. A band pass that is too wide will allow the transmission of incompletely focused light (Chromatic aberration), making stars appear soft or bloated. In such cases image processing can become difficult, so having a slightly narrowed spectral window in your Luminance filter can reduce or eliminate this damaging effect.
To give you all the tools to gather the best data possible we have expanded our line of Luminance filters: Now you can select a Luminance filter perfectly matched to the kind of telescope you use, to get the highest signal and sharpest image for the Luminance channel!
Depending on the color correction of your scope you may use a wider spectral window for the Luminance data. The L1 filter has the widest spectral window, the L2 is about the same as our current L-Filter and the L3 is much narrower.
If you use an optical system that is completely free of any chromatic aberration you should get an L1 filter for your setup. For general use the L2 filter is well suited to most optical systems with a corrector, flattener or reducer in the optical train while the L3 filter is designed for users of refractors with a less-than-perfect color correction and in combination with the new Deep-Sky RGB filters, the L3 filter will minimise the problem of bluish halos around stars.
The transmission curve characteristics and coatings on the new Luminance filters have been designed and engineered in such a way that no halos or reflections will be visible. Even with bright stars in the field of view you will be able to reveal the faintest structures in nebulas or galaxies.
Like all Astronomik Filters, the new Luminance filters are made using an extremely durable and scratch resistant coating, deposited on the finest polished optical substrate, which is free of any striae or internal strains. All substrates are made to exactly the same thickness, so all of our filters are parfocal.
Watch the following video to see how easy the clip filters can be used:
Filter Type: UV/IR/Luminance
Transmission Wavelength: 385 nm - 695 nm
Bandwidth/Bandpass: 310 nm
Filter Optical Thickness: 1 mm
- The Nikon XL-Clip Filter have been successfully tested with the D750, D780, D800, D810 and the D850.
- Since the latest firmware-update of the D850 Clip-filters can't be used with D850 bodies anymore. -We´re sorry for this, but firmware upgrades from Nikon are out of our control. For the D780, you can only use manual focus lenses or a T-adapter (with a telescope). With all lenses with electric contacts you will get an error message and the camera will not work. (Workaround for this: When using lenses with electric contacts on the D780 + D850 you can apply some tape over the lens contacts and the camera will work fine with the XL-Clip Filter installed.)
- Other bodies have not been tested yet.
- The Nikon XL-Clip will not work with cameras with APS-C sized sensors and not with the new mirrorless body. Clip-Filter for the APS-C sized models will be released in the near future.
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