Search found 86 matches
- Thu Dec 22, 2016 8:14 am
- Forum: Solar Scope Modifications
- Topic: Astronomik IR Block filter as internal ERF
- Replies: 12
- Views: 6583
Re: Astronomik IR Block filter as internal ERF
Hello Merlin66 Yes, the use of a Baader H-alpha 35nm as ERF is a good solution, more or less like the others on this chart attached. The Baader H-alpha filters have quality Lambda/2 as the B + W. I have tested (in may samples) that the standard Baader filters have quality lambda/2 as photographic fi...
- Wed Dec 21, 2016 10:41 am
- Forum: Solar Scope Modifications
- Topic: Astronomik IR Block filter as internal ERF
- Replies: 12
- Views: 6583
Re: Astronomik IR Block filter as internal ERF
Hello Vicchio I suggest you read this post (in Italian), with many apologies to all those who do not understand Italian language. http://www.binomania.it/phpBB3/viewtopic.php?f=160&t=8269&start=10 In this post I recommend the use in a small telescopes two photographic filters like ERF (RG630...
- Mon Nov 14, 2016 7:04 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: Dream come true!
- Replies: 113
- Views: 50406
Re: Dream come true!
Hello Bob Yes, the two lenses (in a system with a plano concave and a plano convex lens standard) must be placed as in the drawing, with the plano surfaces facing outward for each optic. Only so the quality of the telescope it is maintained. Hello Christian Yes the lens has an f: 6.6, but this is th...
- Thu Oct 27, 2016 11:37 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: Dream come true!
- Replies: 113
- Views: 50406
Re: Dream come true!
Hello Christian I designed the collimator with OSLO and optimized with Zemax so that none of the surfaces of the lens was flat, then I built the lambda/10 lenses from an important national industry. The system is expensive, but it is perfect. This is the spots diagram with a perfect 150 mm f:10 lens...
- Thu Oct 20, 2016 7:11 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: Dream come true!
- Replies: 113
- Views: 50406
Re: Dream come true!
Hello Bob Also I have had a dream for a long time and I worked for achieve it. For this purpose I have built a slight Truss (see picture 1) 1.jpg for a 150 mm H-alpha Istar lens. After, I have purchased a Lunt Etalon, the model for 60 mm Double stack, for to put it inside the telescope. For this pur...
- Fri Jul 22, 2016 10:58 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: Baader D-ERF Question
- Replies: 15
- Views: 9209
Re: Baader D-ERF Question
Hello to all, Unfortunately, I have no measurement of photographic filters ... Christian, many thanks for your answer. I am a technician of a professional astronomical observatory in Italy … The Zygo of my Institute is set, from several months, for the control of a 300 mm diameter camera for a sate...
- Mon Jun 06, 2016 7:26 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: Baader D-ERF Question
- Replies: 15
- Views: 9209
Re: Baader D-ERF Question
I was hoping to get a scientific answer to my question and instead I received only praise of Baader products, as if I had written that the Baader products are not good ... But I DO NOT wrote that the Baader products are not good… There are at least two good scientific answers to my question. The fir...
- Sat Jun 04, 2016 6:38 am
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: Baader D-ERF Question
- Replies: 15
- Views: 9209
Re: Baader D-ERF Question
Camera filters are usually not 1/4 wave on transmission. Mark W. In fact, I have read that they are machined 1/2 wave ... and what does that mean? I have done many tests with 60 mm and 100 mm lenses and I did not see any difference between the B + W filters and ERF Baader filter, then the differenc...
- Tue May 31, 2016 10:22 pm
- Forum: Commercial Solar Filters/Cameras/Hardware
- Topic: Baader D-ERF Question
- Replies: 15
- Views: 9209
Re: Baader D-ERF Question
Hello Christian I have realized some ERF using a combination of two photographic filters: B+W 091 (RG630) and a B+W 486 (UV-IR Cut) bought used at cheap on Ebay. I have also measured the transmission (attached), compared to Baader and Lunt ERF. Looking into the telescope I do not see the quality dif...
- Mon May 30, 2016 10:32 am
- Forum: Solar Scope Modifications
- Topic: F11 PST scope
- Replies: 18
- Views: 6075
Re: F11 PST scope
Merlin I read the messages of BYoesle: http://www.cloudynights.com/topic/537136-tilt-tuning-etalon/ with great interest. Therefore "Jaquinot spot" (that I did not know before) it is only synonymous of Sweet spot ... Valery I think it is useful to point out that "Sweet spot = De / Do&q...
- Tue May 24, 2016 6:33 pm
- Forum: Solar Scope Modifications
- Topic: F11 PST scope
- Replies: 18
- Views: 6075
Re: F11 PST scope
http://www.astrosurf.com/viladrich/astro/instrument/solar/FP-no-tele.htm This is an excellent reference for those interested in etalons and their performance. OK Merlin, I have found the reference to Jacquinot spot: http://www.cloudynights.com/topic/537136-tilt-tuning-etalon/ Now I study this commu...
- Tue May 24, 2016 12:18 pm
- Forum: Solar Scope Modifications
- Topic: Just blocking filters.
- Replies: 5
- Views: 3276
Re: Just blocking filters.
Why you thought it was done by many people, for example:Ghost-Fire wrote:Has anyone experimented imaging with just your blocking filter and erf?
http://www.considine.net/dgroski/halpha/
However, the quality of an ERF-ETALON-BF system is superior ...
- Tue May 24, 2016 11:16 am
- Forum: Solar Scope Modifications
- Topic: F11 PST scope
- Replies: 18
- Views: 6075
Re: F11 PST scope
Antonello, I don't have access to my computer to supply the links I have... If you search this forum on "sweet spot" and look for this discussions in early 2015 ( Bob Y. Etc) you should find the formula and discussions on the Jaquinot spot. Merlin Thank you, but I already know of these do...
- Fri May 20, 2016 5:27 am
- Forum: Solar Scope Modifications
- Topic: First PST Mod Questions and Check
- Replies: 6
- Views: 4050
Re: First PST Mod Questions and Check
5) I will be using a Lunt ERF for this Mod. Is the transmission profile similar for the Lunt as the Baader? Hello I was in charge of recent solar astronomy and in our laboratory I have done many tests on solar filters (BF, ERF, etc.). This is the graph of the transmission curve of three different E...
- Thu May 19, 2016 5:00 pm
- Forum: Solar Scope Modifications
- Topic: F11 PST scope
- Replies: 18
- Views: 6075
Re: F11 PST scope
Thank you Merlin, it is always nice to learn.
Thank you for references. I will look.
Thank you for references. I will look.
- Thu May 19, 2016 4:06 pm
- Forum: Solar Scope Modifications
- Topic: F11 PST scope
- Replies: 18
- Views: 6075
Re: F11 PST scope
My English is not good to understand what you're thinking. My approach is more experimental: in my collimated system with etalon (a Lunt etalon 60 mm) inside my F:10 telescope, 100 mm f:1000 there is an image area (0.5 °) in which I see the sun in H-alpha. Outside this circle (sweet spot) the image ...
- Thu May 19, 2016 3:38 pm
- Forum: Solar Scope Modifications
- Topic: F11 PST scope
- Replies: 18
- Views: 6075
Re: F11 PST scope
OSLO (as zemax) does not determine the sweet spot...
Oslo allows you to calculate the angle of the collimated rays inside the etalon. Many larger is this angle, respect to optical axis, and many small is the sweet spot. Elementary.
Oslo allows you to calculate the angle of the collimated rays inside the etalon. Many larger is this angle, respect to optical axis, and many small is the sweet spot. Elementary.
- Thu May 19, 2016 3:25 pm
- Forum: Solar Scope Modifications
- Topic: F11 PST scope
- Replies: 18
- Views: 6075
Re: F11 PST scope
... What I have written is a result of the analysis with an optical design software .... (OSLO)
- Thu May 19, 2016 10:21 am
- Forum: Solar Scope Modifications
- Topic: F11 PST scope
- Replies: 18
- Views: 6075
Re: F11 PST scope
Perhaps it is better to be more specific At the same focal, closing the opening to the objective, all extrassial rays, inside a collimated etalon, continuing to have the same angle. So the sweet spot remains the same. In other words: A 80 mm vixen F: 11 has the same sweet spot of 40 mm F.22. The Swe...
- Fri May 22, 2015 6:24 am
- Forum: Solar Scope Modifications
- Topic: PST mod1 on a C8 without ERF
- Replies: 7
- Views: 3227
Re: PST mod1 on a C8 without ERF
we have already a definition > 100mm scope! This is exactly what I wanted to say... Having a 200 mm and see as a 100 mm is not (for me) pleasant :( . (I have also a telescope Tal 100 mm, with internal etalon lunt, and I know exactly what I can do with him). Naturally, my speech was not for belittle...
- Thu May 21, 2015 7:03 pm
- Forum: Solar Scope Modifications
- Topic: PST mod1 on a C8 without ERF
- Replies: 7
- Views: 3227
Re: PST mod1 on a C8 without ERF
Yes, I think you're right... I had not checked the transmission of a photographic Baader Astrosolar (T = 0.00015) ...
Unfortunately, it is sad to see the noticeable drop in quality with the three filters (but also with 5 filters, I think...) ...
Unfortunately, it is sad to see the noticeable drop in quality with the three filters (but also with 5 filters, I think...) ...
DSobserver wrote: I doubt : the astrosolar will block to much light!
- Thu May 21, 2015 5:25 pm
- Forum: Solar Scope Modifications
- Topic: Solar Continuum - leaky filter mount
- Replies: 8
- Views: 1937
Re: Solar Continuum - leaky filter mount
I did not write that this is right ... :-) I have just written "it is normal": all production is so, not only your filter. The problem can be solved only by Baader doing a little less thin the ring block in the filter holder ... or placing a new and bigger stop ring ... as you did. :-) Ant...
- Thu May 21, 2015 6:45 am
- Forum: Solar Scope Modifications
- Topic: Solar Continuum - leaky filter mount
- Replies: 8
- Views: 1937
Re: Solar Continuum - leaky filter mount
It is a normal thing... The filters are placed in a special plate which covers a little the periphery of the filters, before treatment under high vacuum ... I have the filter 1.25 " and also to 2" inches. Both of the filters are not treated up to the edge, however, in the model by two inch...
- Thu May 21, 2015 6:14 am
- Forum: Solar Scope Modifications
- Topic: PST mod1 on a C8 without ERF
- Replies: 7
- Views: 3227
Re: PST mod1 on a C8 without ERF
Sorry, maybe you get a better result by putting in front to telescope an astrosolar Baader photographic sheet and behind, before the PST, an ERF by two inches?
Antonello
Antonello
- Sun May 03, 2015 3:27 pm
- Forum: Solar Scope Modifications
- Topic: Barlow F30?
- Replies: 17
- Views: 5327
Re: Barlow F30?
Thank you mdwmark I saw your ZEMAX project. Really many compliments for the excellent design with commercial lenses. From what I have seen everything has to work perfectly. Your telecentric barlow transforms in f: 32 an f: 5.56, and seems suitable for a specific telescope, in fact is 5.75X. Who need...
- Sat May 02, 2015 7:19 am
- Forum: Solar Scope Modifications
- Topic: Barlow F30?
- Replies: 17
- Views: 5327
Re: Barlow F30?
Well said, marktownley me too have concluded my message suggesting to Galosimo the use of a telecentric 5x . As I have shown, under certain conditions it is possible to use a collimated system (such as Lunt telescopes with internal Etalon and like the CORONADO PST), but it is not possible or advisab...
- Thu Apr 30, 2015 10:22 am
- Forum: Solar Scope Modifications
- Topic: Barlow F30?
- Replies: 17
- Views: 5327
Re: Barlow F30?
Galosimo, If I understand correctly, you want to find a solution to use the Etalon PST in your telescope 152/900 f: 6 (which is different from the original PST telescope 40/400 f: 10). As you know you can remove the front lens of 40/400 original PST and put another telescope f: 10 with a very large ...
- Wed Apr 29, 2015 9:25 am
- Forum: Solar Scope Modifications
- Topic: Barlow F30?
- Replies: 17
- Views: 5327
Re: Barlow F30?
Yes, you have to use a telecentric Barlow and you have to remove both lenses from PST, also the positive rear ...
- Tue Apr 28, 2015 9:38 pm
- Forum: Solar Scope Modifications
- Topic: Tube ring for precise tilt of filters
- Replies: 3
- Views: 3037
Re: Tube ring for precise tilt of filters
Yes, I had fun doing them, but now I'm having more fun to use them to watch the sun ...
marktownley wrote:Cool little adapters! Glad you're having fun modding
- Tue Apr 28, 2015 10:12 am
- Forum: Solar Scope Modifications
- Topic: Tube ring for precise tilt of filters
- Replies: 3
- Views: 3037
Tube ring for precise tilt of filters
Hello I hope to write a helpful message to someone, explaining my system to adjust the tilt of a filter in an optical path. Not long ago I bought two filters 25 mm in diameter Omega Optical like those of this Ebay auktion: http://www.ebay.it/itm/Optical-Interference-Filter-656-3-H-Alpha-0-15nm-Band-...
- Mon Apr 27, 2015 10:27 am
- Forum: Solar Scope Modifications
- Topic: Etalon spacers thickness.
- Replies: 28
- Views: 7500
Re: Etalon spacers thickness.
Hello swisswalter Thank you. I read this your work: http://www.wastronomiko.com/images/ausruestung/luntLS50H_repair.pdf Congratulations for your patience. Obviously you get more easily success sending all to Oliver Smie or buying a silica wafer with parallelism less of 10 nm. Here are two other supp...
- Fri Apr 24, 2015 8:34 am
- Forum: Solar Scope Modifications
- Topic: Etalon spacers thickness.
- Replies: 28
- Views: 7500
Re: Etalon spacers thickness.
Hello Yesterday I found the time to play with this program for etalon design: https://lightmachinery.com/optical-design-center/etalon-designer/# and I discovered many interesting things. It is possible see immediately the theoretical results that correspond to certain characteristics of the discs se...
- Thu Apr 23, 2015 7:34 am
- Forum: Solar Scope Modifications
- Topic: Etalon spacers thickness.
- Replies: 28
- Views: 7500
Re: Etalon spacers thickness.
Like many of you, I too have read the Etalon theory and I thought I would try to build one. The idea came to me because I have two optical windows with 40 mm of diameter machined to lambda/10 , and I have the possibility of covering the two adjacent sides (Etalon mode) with a treatment that reflects...
- Fri Mar 27, 2015 8:17 am
- Forum: Solar Scope Modifications
- Topic: Blocking Filter alternatives
- Replies: 21
- Views: 6361
Re: Blocking Filter alternatives
You are right my images may not accurately show the image quality obtained with 1.5A Omega Optical filter as BF. I can write with certainty, that the quality of the image that i see with him is good, with many details, but is below the image quality offered by the objective in white light. Even visu...
- Thu Mar 26, 2015 7:19 am
- Forum: Solar Scope Modifications
- Topic: Blocking Filter alternatives
- Replies: 21
- Views: 6361
Re: Blocking Filter alternatives
Hello swisswalter Please note that I have corrected my previous message to explain better what I meant. Unfortunately I am not a skilled photographer and I have no experience in astronomical photography with small telescopes, but I made two photographs. The photographs were taken with a photographic...
- Tue Mar 24, 2015 1:00 pm
- Forum: Solar Scope Modifications
- Topic: Blocking Filter alternatives
- Replies: 21
- Views: 6361
Re: Blocking Filter alternatives
Hello All I'm a new member. My English is not good, but I try the same to communicate. I have bought two 1,5A H-alpha Omega Optical filters http://www.ebay.com/itm/310955342486?ru=http%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_from%3DR40%26ghostText%3D%26_sacat%3D0%26_nkw%3D310955342486%26_rdc%3D1 and ...