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Astronomik L-2 UV-IR Block 2" (E48)


Quick Overview

The Astronomik L-2 UV-IR Block 2" (E48) is recommended for those imagers with good instruments, using coma correctors, focal reducers and field flatteners. The L-2 filters are the medium range bandpass of Astronomik's Luminance range and will work extremely well with their RGB filter sets.
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Luminance data is of extreme importance to modern astronomical imaging – it’s the backbone of any long duration image – so astrophotographers must be sure they are getting the information they need, without artefacts and other optical discrepancies that will ultimately negatively influence a final image. Combatting the dreaded “star bloat”, which often ruins what would be perfectly good images, can be a constant headache for imagers – and there’s only so much that post-processing will achieve in attempting to control this.

This is where the Astronomik L-filters come in. These are available in L1, L2 and L3 levels of bandpass: L1 being the widest spread, L2 the median and L3 the harshest cut. Generally speaking, it is recommended that those using high Strehl ratio telescopes, which suffer from very little chromatic aberration use the widest L1 filters for imaging purposes; those using field flatteners, coma correctors or focal reducers should opt for the L2 bandwidth option; whereas those who are using instruments which suffer from more noticeable blooming around brighter stars should opt for the narrower, harsher L3 filters, which should help to minimise such aberrations.

Astronomik L-Filters are overcoated with hard wearing, scratch-resistant coatings which combat bloom around brighter stars and objects. When combined with the Astronomik Deep Sky RGB filters (which, common to the entire Astronomik range, the L-Filters are all parfocal with), halos and flaring will be a thing of the past.

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