Optolong L-Ultimate 2" Light Pollution Dual Passband Imaging Filter 3nm Ha/OIII


Availability: More on the way

Take back the night sky by using the Optolong L-eXtreme 2" Dual Passband filter when imaging. Take your backyard imaging to places you never thought possible.

Our Product #: OPTOLULT2
Optolong Product #: L-eXtreme 2"
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Product Description

Optolong filters are here to help all of us Earth based Astronauts.  As light pollution gets worse and worse we need something in our tool kit to help us photograph the night sky.  Urban sprawl has created skies that just aren't conducive to imaging.  You can fight back with the assistance of filters.  In the past it has been an expensive proposition to purchase separate filters and filter wheels.  The Optolong L-Ultimate filter will help your imaging tremendously, especially if you have to capture from a light polluted area.  

The L-Ultimate 2" builds on the foundation of the past offereing from Optolong and helps our imaging by isolating specific emission lines.  Unlike the L-eNhance filter, the L-Ultimate works on two emission lines while blocking out the H-beta portion.  The filter instead concentrates the 3nm passband on the H-alpha at 656.3nm and OIII at 500.7nm, which is generally the area that nebulas have their strongest emission.  It gets rid of all the other light pollution emission lines so only the emission and reflection signals of the nebula are captured during your session.   Enjoy the darker sky background and the contrast between the nebulae and the signal to noise ratio that has been improved once again. This dual-band pass filter has been designed to work with DSLR, Color CMOS, and monochrome CCD Cameras.  However, fast focal ratio systems will not work with it.

The filter itself is very well made.  The multi-layer anit-reflection coating is based on an Ion-assisted technology known for durability and Resistance to scratching.  The technology also provides stability to the CWL (central wavelength) allowing no deviation with temperature change.  The 1/4 wavelength Schott glass filter is housed in a very thin CNC machined housing..  The L-Ultimate comes in a plastic case to protect your investment when not in use.

Tech Details

Color 0 - Not a color filter
Size 2"


Review by:
This filter works great! I live in the city and it was a waste of time to try and image. This filter allows me to photograph nebula like I'm in dark skies with 3 minute exposures. Expensive, but I'm 100% satisfied. (Posted on 1/4/2024)
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