Description

ASTF – Baader Solar Filter for all high-end Telescopes (Refractors, Reflectors, CATs)

This family of solar filters is made in the most elaborate way. AstroSolar must not be put under stress, neither during mounting of the film, nor during any temperature change. For this reason the ASTF-Filter features a temperature compensated cell. The film itself is repeatably cemented onto an injection molded ring, whereas the substrate of that ring has the same thermal expansion like the AstroSolar Filter material itself. This free floating film-carrier ring is held onto the aluminum frame with the help of another holding ring made of fiber reinforced plastic – for a maximum of security against breakage of the cell. This temperature compensated cell enables the AstroSolar filter material to retain its excellent optical quality at any temperature – be it -30°C or +50°C

Safe for solar observation and photography with all high-end telescopes and extreme tele-lenses
AstroSolar Safety Film OD 5.0, mounted stress free in temperature compensated cell
Suitable for highest magnifications and detailed observation of individual sunspots
No Astigmatism during winter observation or with temperature changes in summer
2 sets of 3 injection molded centering-bolts (length 38mm) with threaded brass inserts to center the filter-cell in front of the tube opening. These bolts come in two diameters, 10mm and 20mm. Each bolt features injection molded rubber grip-faces, shaped to easily slide onto any telescope tube – but to come off very hard.
Includes 3 Safety Straps with adhesive pads, screws, washers and instructions

NOTE: SCT Users must only mount the filter to the Outside of the Tube (the limited depth of the SCT front ID prevents adequate engagement of the centering bolts)

Alpine #	Baader #	Aperture (mm/inch)	Ideally Suited for Aperture Range (mm)	Clamping Range Inner Tube Dia	Clamping Range Outer Tube Dia
ASTF-80	24593310	80 / 3.2	70 - 90	130 - 170	100 - 140
ASTF-100	24593311	100 / 3.9	90 - 110	150 - 190	120 - 160
ASTF-120	24593312	120 / 4.7	110 - 130	170 - 210	140 - 180
ASTF-140	24593313	140 / 3.2	130 - 150	190 - 230	160 - 200
ASTF-160	24593314	160 / 5.5	150 - 170	210 - 250	180 - 220
ASTF-180	24593315	180 / 7.1	170 - 190	230 - 270	200 - 240
ASTF-200	24593316	200 / 7.9	190 - 210	250 - 290	220 - 260
ASTF-240	24593317	240 / 9.5	230 - 250	290 - 330	260 - 300
ASTF-280	24593318	280 / 11.0	270 - 290	330 - 370	300 - 340

About BSF

After 15 years of offering AstroSolar film sheets as a DIY-product, this system of Baader Solar Filters™ is designed to retain the true optical quality of the diffraction limited AstroSolar Safety Film.

Baader Solar Filters provide a professional and secure solution to observe and image the Sun using AstroSolar Safety Film. Many ready-made filters stretch the filter material like a drumhead in order to make it look like a piece of glass – this absolutely estroys the image quality, rendering the film useless for high magnification work. AstroSolar must be mounted entirely stress free in order to perform like a high precision planeoptical window. It sounds like a contradiction with the traditional perception of quality, but AstroSolar must show slight ripples! When the film is put under stress by an improper cell mount its optical quality is degraded and it tehn performs just like a common coated glass-filter made of untreated floatglass.

With AstroSolar™ the Sun appears in it’ s real color – neutral white. Other films and most glass filters produce a blurry bluish, yellow-orange, or reddish Solar image, thereby cutting part of the spectrum. Especially with an orange sun, it is very hard to see faculae regions which are visible predominantly in the blue wing of the spectrum.

Baader Solar Filters are available in 3 types; ASTF - AstroSolar Telescope Filter, ASSF - AstroSolar Spotter Filter, and ASBF - AstroSolar Binocular Filter. With a total 21 sizes, there is a Baader Solar Filter available to fit practically every Telescope, Spotting Scope and Binocular.

Supplied with each BSF

Original Baader AstroSolar® Safety Film (OD 5.0), cell mounted and quality inspected by skilled members of Baader's staff
Clear white IR-rejecting front ring with reinforcing raised edges along the outer and inner circumference, designed to protect the solar filter material from contact with any sharp metal edge
3 injection molded centering-bolts with threaded brass inserts to center the filter-cell in front of the tube opening. These bolts come in three different diameters, depending on the filter category (ASTF/ASSF/ASBF). Each bolt features injection molded rubber grip-faces, shaped to easily slide onto any telescope tube – but to come off very hard
No tool mounting and adjustment of the centering bolts to fit a wide variety of mechanical tube diameters. Bolts made to contact the outside or optional (if appropriate) the inside of the optical instrument tube NOTE: SCT Users must only mount the filter to the Outside of the Tube (the limited depth of the SCT front ID prevents adequate engagement of the centering bolts)
Non-rotating sliding fasteners made from aluminum that hold the centering bolts. These metal sliders are equipped with a machined indicator to point towards the adjustment index
Additional Phillips screws are integrated into the sliding fasteners, so that the centering bolts can be firmly fastened with a screw driver if preferred by the user
Index scale provided beside each adjustment slot – adjacent to each sliding fastener, for fast and repeatable adjustment of the filter cell onto different telescope tubes
Black sliding washers supplied to securely cover the full length of the adjustment slots in the aluminum frame – for blocking sunlight from passing trough the filter cell beside the filter area
Only for ASTF-filters: rubber plugs supplied as cover for closing unused adjustment slots in the aluminum frame
Three security straps included, to secure the position of the filter cell with Velcro-adhesive pads. A safety feature to absolutely ensure a secure fit in front of the telescope under any circumstances (gust of wind asf)
Warning text printed onto the front side of each filter cell: Read the Instructions before use
Cardboard gift box fit for safely shipping the filter

Safety Information

Safety Warning - How to Protect Your Eyes (link to Safety Information)

Safety Precautions - How to Prevent Accidents (link to Safety Precautions)

Specifications

80mm

FILTER SIZE	80 mm
MANUFACTURER	Baader Planetarium
SKU (#)	2459310
EAN CODE	4047825032997
USAGE	Visual solar observation and imaging at high magnification
ASTROSOLAR FILM	AstroSolar Safety Film
OPTICAL DENSITY	5.0
INNER DIAMETER / CLEAR APERTURE (MM)	80
OUTER DIAMETER	170
FILTER MOUNTED?	Yes
OUTER CLAMPINGRANGE (10MM BOLTS)	110 – 140
INNER CLAMPINGRANGE (10MM BOLTS)	130 – 160
OUTER CLAMPINGRANGE (20MM BOLTS)	100 – 130
INNER CLAMPINGRANGE (20MM BOLTS)	140 – 170
SOLAR WAVELENGTH	Whitelight (integral light)

100mm

FILTER SIZE	100 mm
MANUFACTURER	Baader Planetarium
SKU (#)	2459311
EAN CODE	4047825033000
USAGE	Visual solar observation and imaging at high magnification
ASTROSOLAR FILM	AstroSolar Safety Film
OPTICAL DENSITY	5.0
INNER DIAMETER / CLEAR APERTURE (MM)	100
OUTER DIAMETER	190
FILTER MOUNTED?	Yes
OUTER CLAMPINGRANGE (10MM BOLTS)	130 – 160
INNER CLAMPINGRANGE (10MM BOLTS)	150 – 180
OUTER CLAMPINGRANGE (20MM BOLTS)	120 – 150
INNER CLAMPINGRANGE (20MM BOLTS)	160 – 190
SOLAR WAVELENGTH	Whitelight (integral light)

120mm

FILTER SIZE	120 mm
MANUFACTURER	Baader Planetarium
SKU (#)	2459312
EAN CODE	4047825033017
USAGE	Visual solar observation and imaging at high magnification
ASTROSOLAR FILM	AstroSolar Safety Film
OPTICAL DENSITY	5.0
INNER DIAMETER / CLEAR APERTURE (MM)	120
OUTER DIAMETER	210
FILTER MOUNTED?	Yes
OUTER CLAMPINGRANGE (10MM BOLTS)	150 – 180
INNER CLAMPINGRANGE (10MM BOLTS)	170 – 200
OUTER CLAMPINGRANGE (20MM BOLTS)	140 – 170
INNER CLAMPINGRANGE (20MM BOLTS)	180 – 210
SOLAR WAVELENGTH	Whitelight (integral light)

140mm

FILTER SIZE	140 mm
MANUFACTURER	Baader Planetarium
SKU (#)	2459313
EAN CODE	4047825033024
USAGE	Visual solar observation and imaging at high magnification
ASTROSOLAR FILM	AstroSolar Safety Film
OPTICAL DENSITY	5.0
INNER DIAMETER / CLEAR APERTURE (MM)	140
OUTER DIAMETER	230
FILTER MOUNTED?	Yes
OUTER CLAMPINGRANGE (10MM BOLTS)	170 – 200
INNER CLAMPINGRANGE (10MM BOLTS)	190 – 220
OUTER CLAMPINGRANGE (20MM BOLTS)	160 – 190
INNER CLAMPINGRANGE (20MM BOLTS)	200 – 230
SOLAR WAVELENGTH	Whitelight (integral light)

160mm

FILTER SIZE	160 mm
MANUFACTURER	Baader Planetarium
SKU (#)	2459314
EAN CODE	4047825033031
USAGE	Visual solar observation and imaging at high magnification
ASTROSOLAR FILM	AstroSolar Safety Film
OPTICAL DENSITY	5.0
INNER DIAMETER / CLEAR APERTURE (MM)	160
OUTER DIAMETER	250
FILTER MOUNTED?	Yes
OUTER CLAMPINGRANGE (10MM BOLTS)	190 – 220
INNER CLAMPINGRANGE (10MM BOLTS)	210 – 240
OUTER CLAMPINGRANGE (20MM BOLTS)	180 – 210
INNER CLAMPINGRANGE (20MM BOLTS)	220 – 250
SOLAR WAVELENGTH	Whitelight (integral light)

180mm

FILTER SIZE	180 mm
MANUFACTURER	Baader Planetarium
SKU (#)	2459315
EAN CODE	4047825033192
USAGE	Visual solar observation and imaging at high magnification
ASTROSOLAR FILM	AstroSolar Safety Film
OPTICAL DENSITY	5.0
INNER DIAMETER / CLEAR APERTURE (MM)	180
OUTER DIAMETER	270
FILTER MOUNTED?	Yes
OUTER CLAMPINGRANGE (10MM BOLTS)	210 – 240
INNER CLAMPINGRANGE (10MM BOLTS)	230 – 260
OUTER CLAMPINGRANGE (20MM BOLTS)	200 – 230
INNER CLAMPINGRANGE (20MM BOLTS)	240 – 270
SOLAR WAVELENGTH	Whitelight (integral light)

200mm

FILTER SIZE	200 mm
MANUFACTURER	Baader Planetarium
SKU (#)	2459316
EAN CODE	4047825033048
USAGE	Visual solar observation and imaging at high magnification
ASTROSOLAR FILM	AstroSolar Safety Film
OPTICAL DENSITY	5.0
INNER DIAMETER / CLEAR APERTURE (MM)	200
OUTER DIAMETER	290
FILTER MOUNTED?	Yes
OUTER CLAMPINGRANGE (10MM BOLTS)	230 – 260
INNER CLAMPINGRANGE (10MM BOLTS)	250 – 280
OUTER CLAMPINGRANGE (20MM BOLTS)	220 – 250
INNER CLAMPINGRANGE (20MM BOLTS)	260 – 290
SOLAR WAVELENGTH	Whitelight (integral light)

240mm

FILTER SIZE	240 mm
MANUFACTURER	Baader Planetarium
SKU (#)	2459317
EAN CODE	4047825033055
USAGE	Visual solar observation and imaging at high magnification
ASTROSOLAR FILM	AstroSolar Safety Film
OPTICAL DENSITY	5.0
INNER DIAMETER / CLEAR APERTURE (MM)	240
OUTER DIAMETER	330
FILTER MOUNTED?	Yes
OUTER CLAMPINGRANGE (10MM BOLTS)	270 – 300
INNER CLAMPINGRANGE (10MM BOLTS)	290 – 320
OUTER CLAMPINGRANGE (20MM BOLTS)	260 – 290
INNER CLAMPINGRANGE (20MM BOLTS)	300 – 330
SOLAR WAVELENGTH	Whitelight (integral light)

280mm

FILTER SIZE	280 mm
MANUFACTURER	Baader Planetarium
SKU (#)	2459318
EAN CODE	4047825033062
USAGE	Visual solar observation and imaging at high magnification
ASTROSOLAR FILM	AstroSolar Safety Film
OPTICAL DENSITY	5.0
INNER DIAMETER / CLEAR APERTURE (MM)	280
OUTER DIAMETER	370
FILTER MOUNTED?	Yes
OUTER CLAMPINGRANGE (10MM BOLTS)	310 – 340
INNER CLAMPINGRANGE (10MM BOLTS)	330 – 360
OUTER CLAMPINGRANGE (20MM BOLTS)	300 – 330
INNER CLAMPINGRANGE (20MM BOLTS)	340 – 370
SOLAR WAVELENGTH	Whitelight (integral light)

Downloads

Baader Solar Filter Manual

How can I observe the eclipse in full safety without buying any commercial product?

Baader Solar Filters Clamping Range

Testreview - The Baader ASTF Solar Whitelight Filter - W. Paolini

Testreview ATT-Magazine: Baader Solar Filters (BSF)