Hutech IDAS Light Pollution Suppression (LPS) Filters.

IDAS filters (formerly marketed under the Tokai brand name) are manufactured in Japan
especially for astronomical applications.

Light pollution suppression (LPS) filters are designed to suppress the common emission lines
generated by artificial lighting, yet allow the important nebula emission lines to pass, thus
enhancing the contrast of astronomical objects, particularly emission nebulae.

Unlike other light pollution suppression filters, IDAS (formerly Tokai) filters are specifically
designed for balanced color transmission using the IDAS unique Multi-Bandpass Technology
(MBT) process. The balanced transmission allows color photographs to be taken with
minimal color cast to broadband emission objects such as stars, galaxies and globular
clusters.

CCD imaging can also benefit, because although CCD imagers can already shoot through
light pollution to some extent, including an LPS filter to the setup gives an added
(signal-to-noise) edge
.
IDAS LPS filters - Sky & Telescope
Hot New Product for 2000! (December 2000 issue)
Full Review in June 2001 issue!

Note, however, that light pollution suppression filters are not a perfect substitute for dark
skies.

LPS filters are available for 1-1/4" and 2" (48mm) eyepieces, as well as in numerous sizes to
accomodate most popular camera lenses.

LPS mm Price £

P28.6 £119 (1.25")
P37 £136
P48 £162 (2")
P48SCT£196 (SCT Version)
P49 £162
P52 £162
P55 £187
P58 £205
P62 £222
P67 £239
P72 £265
P77 £282
P82 £299

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