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bart1805

I assume the D-ERF is tilted a little bit to reduce the reflections from this surface? Similarly with the Baader 35nm? Actually, can the Baader filter be fitted on the camera nose-piece instead? I add a 656nm/7nm FWHM filter (to boost contrast) on my optical train (250mm RCT), but I place the filte...

bart1805

Thanks Pedro! Yes I am glad it works. But the transmission is really low compared to the Lunt BF1200. So have to think about it if it is worth to experiment more. And how to make good use of it.

bart1805

The good thing about a slow sun is that it is a good time for experiments! Doublestacking two PST etalons behind the 7 inch Intes went reasonably well, but there still were a lot of reflections. The Circular Polarizer does the job it is supposed to do: not a lot more reflections than when using just...

bart1805

Very interesting Alex, thanks for posting. What kind of filter were you using as a blue Erf? I am experimenting with a 150mm aluminised Newton (f/8) and a Baader Blue 2 inch CCD. No succes yet...
viewtopic.php?t=25766

bart1805

I used ferric chloride (40%) for my mirror. Professionals seem to use a solution called green river:
"Green river is a solution consisting of two quarts of distilled water, one quart of hydrochloric acid, and one ounce cupric sulfate."

bart1805

Congratulations Alex, you kept the best for the last day! Truly great images!

bart1805

If you can measure the distance of the focus of the incoming lightcone that is reflected in the 35nm filter you know how far you are from the real focus point of the C8. Optimal distance to the focus point for the front lens of the etalon is 20cm, anything less means that there is substantially more...

bart1805

That looks (even on a phone) amazing! Did you try Christian's Basler with your set up to see if the difference between the 300mm pictures has something to do with the camera?

bart1805

Hi langleif, luckily vignetting and aperture loss are not the same. If you use the etalon in a 100mm f5 telescope and position the etalon at minus 20cm of the focal point, then there is aperture loss. The systems functions as a 50mm f/10. When using a small etalon on a big f/10 scope, yes there is v...

bart1805

Interesting question Mark! Hope somebody has tested it. In addition to that question: what is the effect in theory of tilting the Blocking filter? Will try it out, but curious what to expect.

bart1805

Nice Alex! Is it a big step forward compared to the predecessor of the T300?
Keep the pictures out of St Veran coming!

bart1805

Hi langleif, looks nice! Don't understand completely what you are saying. - there is no difference between a 180mm f/10 refractor and a C8 when you look at the light cone. That the light cone is bigger than the etalon means that you are not able to see the whole of the sun. Not that you are using ju...

bart1805

Brilliant Christian! Looked at the Saint Veran website, what a beatiful place.

bart1805

Nice! The interesting and new part is the prism with the right thread to screw the BF5 in.

bart1805

Thanks guys! Starry Jack: it is a trade off between resolution and seeing. And if I could choose, I would choose a good seeing. And then image with a green or blue filter. (-; Mark and Stu: problem of uneven illumination will be one of the biggest problems, will let you know if I find something to d...

bart1805

Thanks Franco, will post here how it evolves. CS! Bart.

bart1805

For some time I am trying to doublestack two PST etalons. Here is more information about the adapter Gerd Neumann made for me and the older experiments: https://solarchatforum.com/viewtopic.php?f=9&t=25524&p=229597&hilit=doublestack#p229597 Two weeks ago the adapter arrived, today first ...

bart1805

Hi Alexandra,
I have still got the original mail I received from Torsten, so if you PM me your mailaddress I will send it to you.
Bart.

bart1805

The images of the conjunction are absolutely brilliant! Thanks for posting!

bart1805

Sorry. AS is Autostakkert and AP stands for alignment points.
What you could do is just lay the camera on your desk when connected tot the computer. Aim at a light. Increase gain and decrease exposure time. If I do so there is a grid visible with the asi178mm.

bart1805

Is not that the famous grid pattern seen in a lot of cameras when using high gain and a very short exposure time?
What is the effect of using slightly bigger AP's in AS?

bart1805

Great image! Is this the successor of the T250?

bart1805

Can't help you with that, post the question on de ZWO forum, they respond very quickly.
https://bbs.astronomy-imaging-camera.com

bart1805

I think you can gain about 5mm with the low profile adapter. But then you can't use the protect window of the 174. So you might need an external IR filter, which means you will loose a couple of milimeter again.
Is the cooled or normal version?

bart1805

Beautiful images of Jupiter and Saturn Jozef. Interesting to see if you could get even more out of it when using Registax. The moon pictures are a bit over sharpened and a bit to dark to my taste, but maybe that is because I am a fan of your soft approach when imaging in H-alpha. Really like the way...

bart1805

Don't know what you mean exactly. The sweet spot is about the size of the sun in a 400mm telescope. So if your focal length is longer, the sweet spot is smaller than the whole sun.

bart1805

Nice David! someone on another forum made the connection with history: on D-Day there should be other features to make the word complete. CTORY is missing.
What is wrong with the processing? To dark?

bart1805

Nothing will change in my opinion. Sweet spot is caused by the etalon, not by the BF.

bart1805

Absolutely stunning! And glad to see some new images taken by you. What kind of 6 inch apo are you using?

bart1805

Thanks Brian, Franco and Pedro. And thanks for the SPOD!

bart1805

Thanks all!
I agree Franco, this could be the end of the 150mm Skywatcher as my H-alpha telescope.
Ronnie, hard to judge if it is a good etalon. I have two, this one seems a bit better than the other one. But the difference is not extreme.

bart1805

Thanks all!
I agree Franco, this could be the end of the 150mm Skywatcher as my H-alpha telescope.
Ronnie, hard to judge if it is a good etalon. I have two, this one seems a bit better than the other one. But the difference is not extreme.

bart1805

marktownley wrote: ↑Mon Jun 03, 2019 5:47 am These are great shots Bart! Looks like the Intes is a good scope.

Thanks Mark! And yes, even with the huge central obstruction the quality seems better than with the 150mm SW.

bart1805

marktownley wrote: ↑Mon Jun 03, 2019 5:47 am These are great shots Bart! Looks like the Intes is a good scope.

Thanks Mark! And yes, even with the huge central obstruction the quality seems better than with the 150mm SW.

bart1805

Quite some experiments last days. This weekend I tried the Intes M703 for H-alpha. Way much easier to transport into the garden than the long 150mm Skywatcher achromat. The imaging train is way less heavy and the optical quality seems better than that of the 150mm f/8 SW. Here is how it looks. Made ...

bart1805

Quite some experiments last days. This weekend I tried the Intes M703 for H-alpha. Way much easier to transport into the garden than the long 150mm Skywatcher achromat. The imaging train is way less heavy and the optical quality seems better than that of the 150mm f/8 SW. Here is how it looks. Made ...

bart1805

Hello Bart, I like your filter support system :-) I have made no progress on my side since I was busy on other things. I've got to get into this in June. BTW, did you observe any temperature issue with the filter ? Best regards Christian Hi Christian, No heat issues at all at the moment. But it is ...

bart1805

Yes, with a Quark CaH it is possible. It is less narrow than a Lunt CaK module or a PST#1 filter.
Brian: MCM can apply coatings to a mirror so it reflects just H-alpha and CaK.

bart1805

Hah, that works Bart! Are you doing that as an alternative to dealuminizing the primary? Very best, Hi Marty, yes that is correct. Exposure time has to be shorter than I am able to reach wit the de-aluminised version. Christian calculated that this would be the case, but off course I had to try it ...

bart1805

Was looking for a aluminised 150mm f/8 mirror but found for very little money another complete Skywatcher 150mm f/8. The light blue tube. The very good news is that it has a retrofit GSO 2 inch 1:10 focuser. The bad news is that the cell of the primary can't be collimated really easy. So in the cate...

bart1805

Nice ones Pedro, beautiful proms!

bart1805

Hi Franco, as mentioned earlier I was doing the same a couple of months ago. For me there were two things on top of the list: - The payload, the 9 inch Rumak is really heavy. - The weight of the mount itself, I have to build everything up and down in the garden and can't really use a dolly. I switch...

bart1805

Nice one David! The close up version in CaK looks like a flower to me.
https://www.warentuin.nl/media/product/ ... jk-e86.jpg

bart1805

Really beautiful images Peter! What is your exposure time in CaK?

bart1805

Yeah! The monster is alive!
Good luck Stu, hope for a lot of good seeing.

bart1805

You mean something like this Marty?
viewtopic.php?f=11&t=25081&p=225276&hil ... st#p225276

Good luck with the testing. Curious how well it operates in CaK. Should be better than the C8.

bart1805

Thanks guys! I really like the Rumak. Curious how good it functions when the seeing cooperates and I will be able to image at shorter wavelengths.

bart1805

Spectacular images Peter! And I also like the way you processed them.

bart1805

Congratulations Pedro!

bart1805

Nice session Mark! Beautiful CaK, was the close up version also with 60mm?

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