Search found 86 matches

by antonello
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...
by antonello
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...
by antonello
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...
by antonello
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...
by antonello
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...
by antonello
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...
by antonello
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...
by antonello
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...
by antonello
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...
by antonello
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...
by antonello
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...
by antonello
Tue May 24, 2016 12:18 pm
Forum: Solar Scope Modifications
Topic: Just blocking filters.
Replies: 5
Views: 3276

Re: Just blocking filters.

Ghost-Fire wrote:Has anyone experimented imaging with just your blocking filter and erf?
Why you thought it was done by many people, for example:

http://www.considine.net/dgroski/halpha/

However, the quality of an ERF-ETALON-BF system is superior ...
by antonello
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...
by antonello
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...
by antonello
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.
by antonello
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 ...
by antonello
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.
by antonello
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)
by antonello
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...
by antonello
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...
by antonello
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...) ...
DSobserver wrote: I doubt : the astrosolar will block to much light!
by antonello
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...
by antonello
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...
by antonello
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
by 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...
by antonello
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...
by antonello
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 ...
by antonello
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 ...
by antonello
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 :)
by antonello
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-...
by antonello
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...
by antonello
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...
by antonello
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...
by antonello
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...
by antonello
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...
by antonello
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 ...