Astronomik CLS Light Pollution Filter - T-Threads
Astronomik CLS Light Pollution Filter - T Thread
The Astronomik CLS blocks the light of the spectral lines of mercury and sodium-vapor lamps and lets the largest part of the visible light and H-alpha emissions pass. All the important emission lines, as well as the spectral region that the very well dark adapted eye can see, can pass through the filter.
The filters are optimized for use with aperture ratios from 1:3 to 1:15. Transmission losses and chromatic distortions, which are problems with other filters, only appear with Astronomik filters when extremely bright aperture ratios of 1:2 and more are used.
The Astronomik CLS Light Pollution Filter is good for use under both dark and urban skies for reducing light pollution made by mercury-vapor lamps. For film photography and modified DLSR use, the CLS filter gives good performance and near perfect color balance. While this filter does perform well with webcam and video equipment under light polluted skies, it is not suitable for planetary use.
Astronomik CLS Light Pollution Filter - T Thread Features.
- 92% transmission at 486nm (H-beta)
- 92% transmission at 496nm (OIII)
- 92% transmission at 501nm (OIII)
- 97% transmission at 656nm (H alpha)
- Pass from 450 to 540nm and beyond 650nm
- Parfocal with other Astronomik filters
- Glass thickness: 1mm
- Completely resistant against high humidity, scratches and aging effects
- Diffraction limited, the filter will not reduce the optical performance of your telescope!
- Astronomik filters are delivered in a high-quality, long lasting, filter box
Questions & AnswersAsk a Question
thickness of T mount
The thickness of this filter is 9mm
Is this an adult size watch?
Yes, this watch will adjust to fit an adult size wrist.
The description states that this filter's usage is "imaging and visual". Does this mean that it can be threaded into the t-mount of an 8" EdgeHD and that it be threaded into an eyepiece?
The coatings on this filter will work both for both visual and CCD imaging. However, a T-thread is not a standard thread size for eyepieces. 1.25" and 2" thread sizes are will not match with a T-threads m42x.75 size.