colinsk
Carpal Tunnel
Reged: 01/17/08
Posts: 2150
Loc: CA
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What is a Helios telescope.
(I thought I could spell.  )
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Mahalo,
Colin Kaminski
Coulter 10.1" Dobsonian
TV-76/Baader Film White Light
LS60T/DS50/FT/BF1200
LDX-75
AT Voyager
Edited by colinsk (03/11/08 07:05 PM)
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Ralph Marantino
Postmaster
Reged: 05/01/05
Posts: 6330
Loc: Old Bridge, New Jersey
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It is a 70mm H-alpha telescope the first item that Coronado produced I believe.
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Lunt H-alpha LS100THa/B3400
Rockland Astronomy Club
Member BAA Solar Section
Central Appalachian Astronomy Club
Astronomical League
DSPST,PST & 70mm Coronado Cal K telescope.2.2A
Zeiss 2 inch prism diagonal&Zeiss Zoom EP
2inch APM Herschel Wedge in a 94mm F7 Brandon
14.5 inch f4.2 Starmaster Dob(Zambuto mirror)
TeleView Genisis SDF with 1000 Oaks Glass filter
Zeiss 63mm f13.5 refractor 1000 Oaks Glass filter
Itty Bitty Solar Radio Telescope.
LHRIES Lite Solar Spectrometer
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colinsk
Carpal Tunnel
Reged: 01/17/08
Posts: 2150
Loc: CA
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Interesting, is it full aperture with a central obstruction?
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Mahalo,
Colin Kaminski
Coulter 10.1" Dobsonian
TV-76/Baader Film White Light
LS60T/DS50/FT/BF1200
LDX-75
AT Voyager
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DavidM
sage
Reged: 03/25/06
Posts: 217
Loc: Sohar, Oman
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Yes, it has a central obstruction. The bandpass is <0.8A, which is a touch larger than the other Coronado filters because the etalon is internal and of a smaller size than the 70 mm front aperture. The plus side of this arrangement is that the cost is less because the etalon is smaller, but you still capture the full 70 mm of light. I think prominences are thus the strong point of this instrument, though surface features show up pretty well too.
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David
16" Meade Lightbridge
70 mm Coronado Helios 1 H-a scope
8" Celestron 8iSE
80 mm Orion EON
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colinsk
Carpal Tunnel
Reged: 01/17/08
Posts: 2150
Loc: CA
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Thank you David. I have been collecting H-alpha design information and I did not know of that design. This seems to be the front runner of the PST technology.
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Mahalo,
Colin Kaminski
Coulter 10.1" Dobsonian
TV-76/Baader Film White Light
LS60T/DS50/FT/BF1200
LDX-75
AT Voyager
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Oldfield
Postmaster
Reged: 03/20/02
Posts: 5814
Loc: Hong Kong
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frankly, since they have this kind of idea for a very long time, I wonder what's new in the Lunt's offering...
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The Home Astronomer from a city where most people are proud of the light pollution
Toys: Orion 100ED, Ranger with NGF-CM, SM40/BF10, TG-SP II, LXD55, DMK 31AF03, Canon 10x30 IS...
My observation log and ideas My General Blog
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DavidM
sage
Reged: 03/25/06
Posts: 217
Loc: Sohar, Oman
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I haven't looked in detail, but I thought the Lunt etalon had no central obstruction, which would give more contrast.
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David
16" Meade Lightbridge
70 mm Coronado Helios 1 H-a scope
8" Celestron 8iSE
80 mm Orion EON
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DavidM
sage
Reged: 03/25/06
Posts: 217
Loc: Sohar, Oman
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The design is essentially the same as the Coronado Maxscope 70, which I believe is to be discontinued, so the Lunt scopes might be the only ones producing this sort of design.
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David
16" Meade Lightbridge
70 mm Coronado Helios 1 H-a scope
8" Celestron 8iSE
80 mm Orion EON
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colinsk
Carpal Tunnel
Reged: 01/17/08
Posts: 2150
Loc: CA
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Quote:
frankly, since they have this kind of idea for a very long time, I wonder what's new in the Lunt's offering...
Lunt is certainly using some of David Lunt's patents so they all did not go to Meade. Here is a drawing from Patent #07149377 by Yakov Sidorin and David Lunt. (Patent Images are Public Domain  )
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Mahalo,
Colin Kaminski
Coulter 10.1" Dobsonian
TV-76/Baader Film White Light
LS60T/DS50/FT/BF1200
LDX-75
AT Voyager
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colinsk
Carpal Tunnel
Reged: 01/17/08
Posts: 2150
Loc: CA
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You can see the similarity to the Lunt sketch that Markus posted.
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Mahalo,
Colin Kaminski
Coulter 10.1" Dobsonian
TV-76/Baader Film White Light
LS60T/DS50/FT/BF1200
LDX-75
AT Voyager
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