Baader 2" Cool-Ceramic Safety Herschel Prism (Visual / Photographic)

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Baader 2" Cool-Ceramic Safety Herschel Prism (Visual / Photographic)

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€ 475.00 Price excl. German VAT tax (19%): € 399.16

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2 ", 23 ° Safety Herschel Prism, utilizing special Phantom Group® coatings for glare control. 2” ClickLock® eyepiece holder.
There is no better and safer method for uncompromising sharp solar observation / photography in white light.
A special heat absorbing ceramic element traps radiant heat similar to the space shuttle heat tiles - without heating the surrounding area too. The fully enclosed housing adds to the safety and prevents the risk of glare.
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€ 475.00 Price excl. German VAT tax (19%): € 399.16

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Product Questions

Is this prism safe to use with a TeleVue NP127is refractor, which is a Nagler-Petzval design. In addition to the first objective doublet lenses, this has a second doublet at the focuser end of the OTA. Thank you.

Question by: Terry on Aug 23, 2019 6:55:00 AM | 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

Question by: Jon Mayer on Jul 11, 2019 5:59:00 PM | 1 Answer(s)

Greetings. I am having focusing issues with this product on a Televue NP 101 (non is) telescope. Are there adapters than can help with this?
Thank you.

Question by: Giuseppe Barbieri on Jun 11, 2017 3:47:00 AM | 1 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)

Is the Herschel wedge compatible with 1.25-inch eyepieces?

Question by: Michael Graham on Jan 7, 2021 12:13:00 AM | 1 Answer(s)

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.

-1

Question by: Herb H. on Jun 11, 2020 3:49:00 PM | 1 Answer(s)

We do not comment on the APO-status of the TV-85, but we confirm that visual and imaging results will show solar surface details in better sharpness when keeping the continuum filter in the light path.

To be straight! The Herschel wedge warrants for a safe solar viewing experience, with only the ND 3.0 filter in place! However, the photopic reception of brightness is very different for different eyes (and related to age as well!).

When adding a solar continuum filter, the user has the same amount of transmission reaching the eye as without such a filter - but only within a 10 nm wide part of the spectrum at 540 nm. For this reason the "overall brighness" is perceived as being less. But if the Herschel wedge (w. ND 3.0 filter in place) were transmitting a dangerous amount of energy - even the small 10 nm "window" would constitute a "danger".

So for a 99.9 % majority of people it is not "necessary" from the aspect of safety, to add another ND -filter on top of the necessary ND 3.0 filter. But - a small number of people do inherit raised sensitivity for brightness, leading to eventual phototoxic reactions in the eye during prolonged and repeated exposure to light levels that would be perceived as normal by others.

Effects of phototoxic overreaction have been exhaustively investigated for the new generation of LED and CREE light sources which can compete in their radiation intensity with solar brightness in the meantime - when stared into at close distance. So the same precautions as valid for direct intensive LED illumination must be observed for Herschel-wedge operation just as well.

Fortunately most people have a "built in" aversive-reaction, to avoid excessive amounts of light falling onto the retina. So everyone observing the sun should be attentive to constantly observe his own "comfort feeling". If the visual brightness is experienced as causing strain on the eye, or an "afterglow-experience" will remain for some time when lifting the eye from the eyepiece, - in these cases a further added 0.9 ND filter will largely help to have a comfortable seeing experience. Adding a 1.8 ND filter though onto the 3.0 ND-filter will dim the solar image to a degree that fine solar details become invisible (unnecessarily).

Do test the Herschel brightness experience in good faith for a few seconds with only the ND 3.0 filter in place (always!). Depending on your age then maybe add a 0.9 ND- or even 0.6 ND-filter, until the image brightness is perceived as comfortable even at viewing sessions of up to 3 minutes. After each 3 minutes a short pause is mandatory, to check for any "afterglow"- effects, for dizzyness or for impaired vision. This is because brightness strain on the eye can bring out hidden retina damages or very early retina dislocation that went unnoticed before.

Only for imaging purposes, the ND 3.0 filter may be taken off the light path and replaced with one of the photographic ND-filters (0.6/0.9 or 1.8 ND) - so as to arrange brightness in a way that the shortest available camera exposure time can be made use of.

Answer by: Baader Web Team (Admin) on Jun 15, 2020 2:42:00 PM

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Could you please let me know how to use this prism in conjuntion with 1.25" double stack cotinuum + polarizing filter + Maxbright II binos?. Thanks in advance.

-2

Question by: Jose Carvajal on Apr 26, 2020 12:23:00 AM | 1 Answer(s)

The basic adaption of our bino-viewers is by replacing the 2" ClickLock of the Herschel with
Baader Adapter 2" (male) / T-2 (male) # 1508035
Then you have a T-2-thread, onto which you can mount the binoviewer or the T-2 QuickChanger as described in the manual (page 18 in the manual of the MaxBright II); the 2"-filters of the Herschel wedge fit into the 2"/T-2 adapter. We recommend a T-2 quickhanger, so that you can insert the glasspath correctors for T-2 into the binoviewer; be careful with the 2.6x gpc as it may hit the filters in the Herschel.

By using the T-2-connection, you can also use
Baader T-2 Conversion Ring # 2958110 plus
Baader Double T-Filterholder 1¼" # 1508030
to mount a 1.25" filter in front of the binoviewer. Again, this may be problematic with the 2.5x gpc as it faces towards the telescope and not into the binoviewer, so make sure that you have enough backfocus.

Installing a single polarizing filter is tricky, as you can't rotate the binoviewer as easily as an eyepiece. There should be enough place to mount the filter in front of the double stack and use the T-2 quickchanger to access it for adjusting the brightness.

Answer by: Baader Web Team (Admin) on Apr 28, 2020 12:18:00 PM

-2

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Can I use the BDSF sunscreen at the same time, to protect my lens from televue 85, and then put the herschell baader prism?
Would it work well?

-3

Question by: Francisco on Jun 4, 2020 6:35:00 PM | 1 Answer(s)

Description

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

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