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The documentation states that the Solar Continuum filter can be removed when using a fully apochromatic APO refractor*. What is implied is that a 1.8 ND filter should be substituted when doing visual observing – with of course the 3.0 ND filter still being in place. Please confirm.
If this is the case, please also clarify if the 1.8 ND filter should be placed where the Continuum filter was with the 3.0 ND behind it closest to the eye piece, the other way around with the 3.0 ND closest to the prism with the 1.8 ND closest to the eye piece, or whether it makes no difference.
*The documentation specifically mentions Astro Physics, TEC, and Zeiss. I am using a Tele Vue-85 which claims APO performance.
If this is the case, please also clarify if the 1.8 ND filter should be placed where the Continuum filter was with the 3.0 ND behind it closest to the eye piece, the other way around with the 3.0 ND closest to the prism with the 1.8 ND closest to the eye piece, or whether it makes no difference.
*The documentation specifically mentions Astro Physics, TEC, and Zeiss. I am using a Tele Vue-85 which claims APO performance.
Question by: Herb H. on Jun 11, 2020 3:49:00 PM | 1 Answer(s)
I will use the prism with a 1.25 inch clicklock and have bought the 2 inch to T-2 adapter to do so. How can I unscrew the 3.0 ND filter from the threaded extension? It seems to be stuck or glued to it and I cannot apply more force without risking damage to. The solar continuum filter unthreaded easily.
Question by: Jan on Jan 25, 2021 10:56:00 AM | 1 Answer(s)
Having used a 2” Lunt Herschel wedge for solar imaging for a while I decided to upgrade to a Baader 2" Cool-Ceramic Safety Herschel Prism (Photographic) in order to be able to reduce the exposure time and being able to freeze the seeing even more.
I ordered the new wedge from WideScreen-Centre in UK, which appeared to be one of few companies having the item in stock. The wedge arrived late last week. I’ve already been able to test it a couple of times and everything seems to work very well. However, I’m not able to remove pre-mounted ND OD 3.0 in order to install one of the less dense ND filters to reduce the exposure times. The Continuum filter unthreads just fine, but the filter is totally stuck. I’m afraid to apply to much force and are wondering if it might have thread lock (locktite) applied or if there some special “technique” in order to remove it.
Or do I need to get a another Baader Adapter 2" (male) / T-2 (male) # 1508035?
Not being able to swap the ND OD 3.0 for one of the less dense somewhat removes whole point for my upgrade.
I ordered the new wedge from WideScreen-Centre in UK, which appeared to be one of few companies having the item in stock. The wedge arrived late last week. I’ve already been able to test it a couple of times and everything seems to work very well. However, I’m not able to remove pre-mounted ND OD 3.0 in order to install one of the less dense ND filters to reduce the exposure times. The Continuum filter unthreads just fine, but the filter is totally stuck. I’m afraid to apply to much force and are wondering if it might have thread lock (locktite) applied or if there some special “technique” in order to remove it.
Or do I need to get a another Baader Adapter 2" (male) / T-2 (male) # 1508035?
Not being able to swap the ND OD 3.0 for one of the less dense somewhat removes whole point for my upgrade.
Question by: Arne Danielsen on May 30, 2022 9:28:00 PM | 2 Answer(s)
I wanted to know if the Herschel prism is recommended to use it with a D-ERF filter in front of the lens to prevent heat from entering and protect the tube? or the D-ERF is only recommended for use in H & alpha ??
Question by: Rafael Segura on Apr 21, 2020 9:37:00 AM | 1 Answer(s)
I'd like to utilize my BaaderHyperion Zoom eyepiece with the matching barlow lens in the Baader Herschel Prism. Unfortunately the protruding barlow addon is interfering with the built in filters. Which extension element can you recommend to shift the ClickLock eyepiece holder away from the filter case of the prism to allow the barlowed Hyperion Zoom fit snugly in the eyepiece holder?
Question by: Somogyi Zoltán on Nov 20, 2021 9:13:00 PM | 1 Answer(s)
When inserting a GPC (2.6) into the adapter #27 (for binoviewing w. the Wedge), the GPC touches the ND filter. How can this be avoided? I could attach an empty 2 inch filter cell to gain some depth, but this is not mentioned in the Solar Wedge's manual. Am I doing something wrong?
Question by: Jan S on Apr 25, 2021 3:09:00 PM | 1 Answer(s)
I have never used a Herschel Wedge before on my refractor--always mylar film, or glass filters on the forward end of the scope.
Will the unfiltered solar energy entering my(very expensive) air spaced triplet objective possibly damage the lens due to over heating? Could I use the wedge/and refractor continuously for 2 or 3 hours with out worry of damage to either? Thank you. Jon Mayer
Will the unfiltered solar energy entering my(very expensive) air spaced triplet objective possibly damage the lens due to over heating? Could I use the wedge/and refractor continuously for 2 or 3 hours with out worry of damage to either? Thank you. Jon Mayer
Question by: Jon Mayer on Jul 11, 2019 5:59:00 PM | 1 Answer(s)
- Description
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Details
Baader 2" Cool-Ceramic Safety Herschel prism, Visual and photographic
There is no better way for uncompromising Solar Observation / Solar Photography in white light
Attention
Every Solar Diagonal needs additional neutral density filters since the reflected energy of the first surface prism (4.6%) still is a factor of 1000 too large for the human eye. All Baader Solar Diagonals are delivered with a pre-mounted ND 3.0 Baader precision 2 light reduction filter. The photographic version includes other ND-Filters to achieve shorter exposure times. Use with care!
- Space-Technology: The exiting beam in the Baader Safety Herschel Wedge is fed into a heat cage separated from the prism body. Like on a Space Shuttle a ceramic tile forming the back end of the heat cage absorbs the radiant heat without overheating its surroundings. The closed prism body offers perfect safety for educational work.
- Solar Finder: The translucent ceramic tile acts as projection screen for the unfocused image of the Sun. Aiming the telescope at the Sun becomes very easy.
- ClickLock 2 Clamp: Securely clamp any eyepiece with only the push of a lever. Change eyepieces single handedly even in winter with heavy gloves.
- Filter Holder: A 2/M48 threaded ring couples the 2 ClickLock-Clamp to the body of the Safety Herschel Wedge and acts as a filter holder for 2 filters.
- Solar Continuum Filter (10nm HBW/540nm CWL): Included as standard filter
- Optional recommended accessories:2 Baader Polarizer-Filter (# 2408342) mounts into any 2 eyepiece or 2 to 1.25 reducer for adjusting image brightness simply by rotating the eyepiece. Reducer ring 2to T-2 (#1508035) allows to mount any DSLR-camera T-mount directly on top of the Solar Diagonal body
Related Articles
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Tips for Choosing an Energy Rejection Filter for H-alpha-Observations
The purpose of an Energy Rejection Filter is to prevent as much solar energy as possible from entering the telescope in the first place and thus avoid excessive heating of the etalon of an H-alpha filter. This is done most effectively by a filter in front of the telescope. At the same time, this prevents the air in the tube from heating up - the telescope remains close to the ambient temperature, and there are no air turbulences inside of the OTA due to temperature differences. If we look at the solar spectrum, it becomes clear that such a filter must primarily block visible light. Ideally, it reflects the solar energy energy instead of absorbing it and and does not heat itself up in the process as well - that's why these filters are called Energy Rejection Filters (ERF for short). Since it is occasionally asked: A Herschel wedge or a white-light front-filter cannot be used as an ERF because it also darkens the H-alpha line. In H-alpha, the sun is far less bright than in white light, so there would be practically no light left to observe. There are usually three types of filters mentioned, when Energy Rejection...
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Don't miss it: Transit of Mercury on November 11th, 2019!
Transit of Mercury LIVE: NASA is broadcasting the film sequences of the solar satellite SDO for all those who cannot observe the Transit of Mercury on November 11th 2019. The films will be available on https://mercurytransit.gsfc.nasa.gov almost in real time: Starting around 1200 UTC (7:00 am ET) November 11, 2019, we will begin watching Mercury move into view against the corona of the Sun. This is about 45 minutes before it is visible against the Sun from the ground. We have created https://mercurytransit.gsfc.nasa.gov to let you watch this transit as short movies in almost real time. The transit lasts a little over 5.5 hours, ending as Mercury leaves the disk of the Sun about 1806 UTC but continues moving out through the corona for another 30 minutes. Only two of the eight planets of the Solar System circle around the Sun closer than our Earth: Venus and Mercury. These so-called "inner planets" (because they are inside of Earth's orbit) are the only ones which can be seen in front of the Sun sometimes. But this isn't as common as you might think: The planets don't orbit the Sun all exactly in the same plane – instead, their orbits are...
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The disc of Mercury near the upper conjunction, captured with the Baader APO Travel-Companion 95/580
Our customer Jörg Schoppmeyer sent us this unusual picture: a circular Mercury, shortly after the upper conjunction and only 1.8° away from the Sun! Mercury is traditionally a difficult object to observe. The reason: The small planet is always close to the Sun and can be seen with the naked eye only shortly after sunset or before sunrise when it is at maximum distance from the Sun. Legend has it that even the great astronomer Johannes Kepler never saw Mercury with his own eye - but Kepler did not have a modern telescope with accessories from Baader Planetarium... On August 18th, 2020, Jörg Schoppmeyer pointed his BAADER APO 95/580 CaF2 Travel Companion (#2300095 , € 4495,-) at Mercury. Since the small planet was only 1.8° next to the Sun, all filters needed for safe solar observation had to be used here. In this case this was a 2" Cool-Ceramic Safety Herschel prism, whereby the additional ND filter was replaced by a Baader Contrast Booster 2" filter. Would it really be possible to catch the tiny Mercury with a brightness of only -1.8mag next to the much brighter Sun? This requires maximum contrast without stray light - neither from...
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