Calcium K-line doublepass by apollo lasky

Frankenscope? Let's see it!***be advised that NOTHING in this forum has been safety tested and you are reading and using these posts at your own peril. blah, blah, blah... dont mess around with your eyesight when it comes to solar astronomy. Use appropriate filtration at all times...
Post Reply
User avatar
TheSkyBurner
Almost There...
Almost There...
Posts: 610
Joined: Sat May 05, 2018 7:55 pm
Contact:

Calcium K-line doublepass by apollo lasky

Post by TheSkyBurner » Tue Sep 04, 2018 7:10 am

This thread is dedicated to Walter Koch(swisswalter). My very first international supporter.

(Place holder)

:seesaw

Okay i have just officially confirmed double pass working and quite capable of producing reflection free images!

I need my polarizer to control the intensity, because i am at 12micro seconds right now. This is with zero erf.

Just kg3 and infrared reflecting -200mm element, the ct393.37 element, the newport mirror, and the focal reducer.
6B7F36D0-A1D7-4C97-9497-04D766689076.gif
6B7F36D0-A1D7-4C97-9497-04D766689076.gif (2.87 MiB) Viewed 291 times
4B2B1A2A-A6CB-47E6-B4E8-820B49DE60FD.gif
4B2B1A2A-A6CB-47E6-B4E8-820B49DE60FD.gif (5.24 MiB) Viewed 291 times
Last edited by TheSkyBurner on Sun Sep 23, 2018 10:09 pm, edited 1 time in total.

User avatar
TheSkyBurner
Almost There...
Almost There...
Posts: 610
Joined: Sat May 05, 2018 7:55 pm
Contact:

Re: 393.4bp0.1 doublepass results(it works!!!!)

Post by TheSkyBurner » Sat Sep 22, 2018 7:28 pm

Have fun guys, ill be gone for two weeks.

Dont let anybody convince you something is not going to work, Just doit yourself and find out yourself.
90% of the time the person saying it wont work, are just not capable of anything but paperwork.

User avatar
TheSkyBurner
Almost There...
Almost There...
Posts: 610
Joined: Sat May 05, 2018 7:55 pm
Contact:

Re: 393.4bp0.1 doublepass results(it works!!!!)

Post by TheSkyBurner » Sun Sep 23, 2018 9:33 pm

meade 90mm x 800mm Not the best, and im still experimenting but i have all the proof in the world that double pass works.

Made with equipment I had on hand.
001.gif
001.gif (10.36 MiB) Viewed 235 times

User avatar
TheSkyBurner
Almost There...
Almost There...
Posts: 610
Joined: Sat May 05, 2018 7:55 pm
Contact:

Re: 393.4bp0.1 doublepass results(it works!!!!)

Post by TheSkyBurner » Sun Sep 23, 2018 9:34 pm

002.gif
002.gif (10.48 MiB) Viewed 235 times

User avatar
TheSkyBurner
Almost There...
Almost There...
Posts: 610
Joined: Sat May 05, 2018 7:55 pm
Contact:

Re: 393.4bp0.1 doublepass results(it works!!!!)

Post by TheSkyBurner » Sun Sep 23, 2018 9:35 pm

000.gif
000.gif (7.79 MiB) Viewed 228 times
Last edited by TheSkyBurner on Sun Sep 23, 2018 9:58 pm, edited 2 times in total.

User avatar
TheSkyBurner
Almost There...
Almost There...
Posts: 610
Joined: Sat May 05, 2018 7:55 pm
Contact:

Re: 393.4bp0.1 doublepass results(it works!!!!)

Post by TheSkyBurner » Sun Sep 23, 2018 9:36 pm

004.gif
004.gif (12.6 MiB) Viewed 235 times

User avatar
TheSkyBurner
Almost There...
Almost There...
Posts: 610
Joined: Sat May 05, 2018 7:55 pm
Contact:

Re: 393.4bp0.1 doublepass results(it works!!!!)

Post by TheSkyBurner » Sun Sep 23, 2018 9:39 pm

006.gif
006.gif (14.62 MiB) Viewed 232 times

User avatar
TheSkyBurner
Almost There...
Almost There...
Posts: 610
Joined: Sat May 05, 2018 7:55 pm
Contact:

Re: 393.4bp0.1 doublepass results(it works!!!!)

Post by TheSkyBurner » Sun Sep 23, 2018 9:42 pm

007.gif
007.gif (7.18 MiB) Viewed 229 times
Last edited by TheSkyBurner on Sun Sep 23, 2018 9:55 pm, edited 1 time in total.

User avatar
TheSkyBurner
Almost There...
Almost There...
Posts: 610
Joined: Sat May 05, 2018 7:55 pm
Contact:

Re: 393.4bp0.1 doublepass results(it works!!!!)

Post by TheSkyBurner » Sun Sep 23, 2018 9:43 pm

008.gif
008.gif (7.51 MiB) Viewed 230 times
Last edited by TheSkyBurner on Sun Sep 23, 2018 9:51 pm, edited 1 time in total.

User avatar
TheSkyBurner
Almost There...
Almost There...
Posts: 610
Joined: Sat May 05, 2018 7:55 pm
Contact:

Re: 393.4bp0.1 doublepass results(it works!!!!)

Post by TheSkyBurner » Sun Sep 23, 2018 9:45 pm

009.gif
009.gif (7.22 MiB) Viewed 232 times

User avatar
marktownley
Librarian
Librarian
Posts: 24362
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: 393.4bp0.1 doublepass results(it works!!!!)

Post by marktownley » Sun Sep 23, 2018 10:00 pm

Looks like you're making progress Apollo.
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

User avatar
TheSkyBurner
Almost There...
Almost There...
Posts: 610
Joined: Sat May 05, 2018 7:55 pm
Contact:

Re: 393.4bp0.1 doublepass results(it works!!!!)

Post by TheSkyBurner » Sun Sep 23, 2018 10:02 pm

it is a dire shame the sun is dead :( (even on SDO)


latest_1024_1600.jpg
latest_1024_1600.jpg (197.41 KiB) Viewed 226 times
latest_1024_1700.jpg
latest_1024_1700.jpg (180.21 KiB) Viewed 226 times

User avatar
TheSkyBurner
Almost There...
Almost There...
Posts: 610
Joined: Sat May 05, 2018 7:55 pm
Contact:

Re: 393.4bp0.1 doublepass results(it works!!!!)

Post by TheSkyBurner » Sun Sep 23, 2018 10:06 pm

Now I imagine If i get the proper negative lenses and proper positive lens, this thing will work pretty amazing. But right now the magnification is just too great for my little meade scope. (if i had a larger camera sensor that would broaden things up a bit)

I think Using a negative 300mm lens is the way to do this on an 800mm scope. I am not positive how the negative lenses work just yet, but a quick trial and error with a second lens and I could figure it out real quick

Either gotta increase the negative distance in front of the cube, or decrease the positive distance in front of the camera.

In either case, Its pretty crazy that I got it working with junk I had laying around however, I am happy with this result. :)

My flight to colorado was delayed so luckily I got to pull this off today. I leave in a couple hours.

User avatar
TheSkyBurner
Almost There...
Almost There...
Posts: 610
Joined: Sat May 05, 2018 7:55 pm
Contact:

Re: 393.4bp0.1 doublepass results(it works!!!!)

Post by TheSkyBurner » Sun Sep 23, 2018 10:09 pm

My optics are filthy.........

User avatar
marktownley
Librarian
Librarian
Posts: 24362
Joined: Tue Oct 18, 2011 5:27 pm
Location: Brierley Hills, UK
Contact:

Re: 393.4bp0.1 doublepass results(it works!!!!)

Post by marktownley » Sun Sep 23, 2018 10:17 pm

TheSkyBurner wrote:
Sun Sep 23, 2018 10:09 pm
My optics are filthy.........
I didn't like to say ;)
Image
http://brierleyhillsolar.blogspot.co.uk/
Solar images, a collection of all the most up to date live solar data on the web, imaging & processing tutorials - please take a look!

User avatar
TheSkyBurner
Almost There...
Almost There...
Posts: 610
Joined: Sat May 05, 2018 7:55 pm
Contact:

Re: Calcium K-line doublepass by apollo lasky

Post by TheSkyBurner » Sun Sep 23, 2018 11:03 pm

A little info, i had placed the chroma 402 filter in front of the negative element, and i had a tiffen 102mm linear polarizer over the 90mm objective. The intensity was still over whelming my sensor. So either the rotational polarizer on the camera to directly decrease the transmission is going to be required or i am going to need a stronger erf.

Especially if i get this thing to produce a lower focal length, the intensity is just going to exponentially increase when viewed as a full disk..


I guess if we were to use a pst etalon, since it is totally transparent and put the erf in front of the objective this would definitely work for h-alpha on a full disk image even with the blocking filter.

The reflections are real easy to control. However I think a double wedged etalon is a must if you are going to expect any kind of tuning control.

Also, i know for a fact if we had special coatings on the beam splitter cube you could easily nail h-alpha. If you look at the pentaprism in the black box of a pst, it is coated yellow on the front to obviously block blue light. So somewhere out there is a company already selling coated prisms for h-alpha.

You could theoretically cement the lunt rg650 directly to the first face of the cube, or even better have the negative element made of red glass since it is going to be small, then cement that directly to the cube face and cement the refocus element directly to the beam exit.

In a nutshell, its guranteed to “work”. Not sureif high resolution applies.

But hey, as i already concluded “It Works!!” (This is all that matters in my book.)

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest