£45.00

Altair Astro Planet-Killer 685nm Premium IR Pass Filter with AR Coating

he Altair Astro Planet-Killer 685nm Premium IR Pass Filter is designed to deliver sharper lunar and planetary images with Monochrome CCD or CMOS cameras.

It works by reducing image distortion caused by the atmosphere by passing 685nm and longer IR wavelengths which are less affected by air currents.

This reduces the blurring effects of “bad seeing” for noticeably sharper lunar, planetary or guide star images, even near the horizon. Especially good for CMOS cameras with high infra-red sensitivity.*

When used as a luminance filter with planetary RGB filter sets, extremely fine detail is revealed. When imaged in the daytime lunar and planetary objects appear against a dark background. For monochrome imaging of the moon, day or night, the Planet Killer Filter is all you need!

Another possible application is for auto guiding at long focal lengths, to reduce the effects of air movement on the guide star. This would theoretically produce better information tracking performance because the guide camera would no longer be "chasing" the seeing instead of the mount movements.

Advanced AR coatings reduce halo effects and internal reflections.

Premium filter features:
• Batch-tested for consistency.
• High quality dichroic/dielectric coatings.
• Anti-Reflection coating to reduce star-halos - stackable.
• UV/IR block for imaging.
• Ultra-flat glass by Schott Germany.
• Precision CNC machined filter cell for strain-free mounting and freedom from tilt.

* such as the AR0130 sensor found in the Altair GPCAM.

£249.99

Altair Astro Premium 1.25" Narrowband SOH CCD Filter Set SII-CCD 6.5nm H-Alpha 7nm OIII 6.5nm

The Altair Astro Premium SHO-CCD filter set is designed for astro imaging with Mono CCD or CMOS cameras.

Buying the set allows significant cost savings as opposed to purchasing the filters separately.

The SOH set comprises three 1.25" filters:
SII-CCD 6.5nm
OIII 6.5nm
H-Alpha 7nm
Designed for monochrome imaging of nebulae. Eliminates light pollution by avoiding the light pollution wavelengths.

Also drastically reduces, moon and skyglow allowing for long exposures in urban conditions.

Features precise and steep transmission curves with narrow pass-bands to ensure high image contrast.

Aside from the high qualty Schott German glass and top quality coatings, these filters have some additional enhancements which make them ideal for your astro imaging application.

Advanced UV/IR blocking give small star sizes even with refractor optics, and AR (Anti Reflection) coatings reduce halo effects and internal reflections for more pleasing star images.

OIII filter can also be usd for visual observation of nebulae with apertures of 6-8” or more, providing extremely high contrast.

Premium filter features:
• Batch-tested for consistency.
• High quality dichroic/dielectric coatings.
• Anti-Reflection coating to reduce star-halos - stackable.
• UV/IR block for imaging - star bloat reduction with refractors.
• Ultra-flat glass by Schott Germany.
• Precision CNC machined filter cell for strain-free mounting and freedom from tilt.

£139.99

Altair Astro Premium 1.25" LRGB CCD Filter Set UV/IR Block & AR Coating

The Altair Astro Premium LRGB-CCD Filter is designed for imaging with Mono CCD or CMOS cameras.

Aside from the high qualty Schott German glass and top quality coatings, these filters have some additional enhancements which make them ideal for your astro imaging application.

Advanced UV/IR blocking give small star sizes even with refractor optics, and AR (Anti Reflection) coatings reduce halo effects and internal reflections for more pleasing star images.

Red Green and Blue wavelengths are carefully matched with minimal overlap and a tight fit within the Luminance filter transmission range, as can be seen from the spectrum graph. This results in pure colours with maximum efficiency.

Premium filter features:
• Batch-tested for consistency.
• High quality dichroic/dielectric coatings.
• Anti-Reflection coating to reduce star-halos - stackable.
• UV/IR block for imaging - star bloat reduction with refractors.
• Ultra-flat glass by Schott Germany.
• Precision CNC machined filter cell for strain-free mounting and freedom from tilt.

Baader Solar Filters

Baader solar filters are made form Baader ND 5.0 Astro Solar Film and feature an ASTF filter-cell:
temperature compensated for highest resolution.

ideal for higfh resolution imaging or visual use

See the images for Telescope Clamping range.

IDAS P2 LPS Light Pollution Filter

The Japanese-made IDAS P2 LPS is in our opinion the BEST Light Pollution Suppression filter for astro photography with DSLR, colour and mono CCD cameras.

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 (see filter plots).

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

IDAS LPS filters utilize the unique IDAS Ion Gun Assisted Deposition (IGAD) coating technology for superior coating durability (quartz hardness) and safer cleaning. IGAD coatings also improve temperature and humidity stability, reducing spectrum shifts down to +/-1nm from the +/-3 or 4nm shift of standard coatings.

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. The filter also blocks infrared so a separate IR blocking filter is not needed.

IDAS D1 LPS Light Pollution Filter

The Hutech IDAS D1 LPS is in our opinion the BEST Light Pollution
Suppression filter for astro photography with DSLR and colour CCD cameras.

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 (see filter plots).

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

Hutech IDAS LPS filters utilize the unique IDAS Ion Gun Assisted
Deposition (IGAD) coating technology for superior coating durability
(quartz hardness) and safer cleaning. IGAD coatings also improve
temperature and humidity stability, reducing spectrum shifts down to
+/-1nm from the +/-3 or 4nm shift of standard coatings.

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.

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

LPS filters are available in 1.25" and 2" threaded cells, other sizes
are available on request.

£149.00

Skywatcher 1.25" LRGB Filter Set

Designed for CCD astrophotography, the set includes Luminance-IR, Red, Green, and Blue CCD filters. The filters are resistant to humidity and scratching and set into a durable aluminium alloy threaded mounting ring. The red green and blue filters have been developed to closely match the natural colours of stars, planets and emission nebulae, whilst the luminance filter removes damaging haze and ultraviolet. The filters offer light transmission of nearly 100%. Please note the red, green and blue filters are not IR coated.

Skywatcher Variable Polarising Filter

These high quality anodized aluminium, optical glass variable polarising filters reduce the amount of light entering your eyepiece. You can progressively dim the view when observing a bright object, such as the Moon or certain planets, to a level according to your needs, whilst increasing contrast, reducing glare and increasing the amount of detail that can be studied. The light transmission can be varied from 40% down to as little as 1%. The filter will not change the colour of the object being viewed and will prevent eye fatigue and loss of night vision. Each filter set consists of two polarizing filters, one which can be rotated in its cell to adjust the brightness. The filters, used as single elements, can also be used for daytime terrestrial use for reducing sunlight glare from lakes oceans or window glass. Available in two sizes, threaded to fit either standard 1.25” or 2” astronomical eyepieces. Supplied with storage case.