Lunt CaK B1800, inside visual inspection

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...
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allhoest
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Lunt CaK B1800, inside visual inspection

Post by allhoest » Mon Mar 12, 2018 8:38 pm

Hi!
I just bough a one of these CaK; here is the first inspection.
CS
Alex


The filter, side and top views

Image
Image



The diagonal assembly.
The allen heads are metric (!).
The screws were not tight fasten; some were even lose. Why? For any mirror compression issues? The mirror is fixed by some material, glue-foam probably. It can freely move, expand.

Image



The diagonal itself is manufactured from a plain bloc.

Image



My fear was that the mirror would be somehow treated, for dimmer reflection, like the blocking filters of coronado.
I have no real mean to measure the reflected flux, but while pointing the mirror toward the sun, plenty of light is reflected.

Image



The front filter.
Sorry, I didn't feel the need to dismantle it…

Image



The front assembly can be simply unscrewed. No need to take out the allen screws. It is a T2 thread.

Image



The view to the intermediate filter shows some deposit on it. It looks terrible on the picture, because of the angle of view. But as we will see later, we can see something through it.
Finally, maybe I should dismantle these front assembly filters, for inspection.

Image



The connecting part of the front assembly has an aperture of about 18mm

Image



The rear assembly shows the 3rd filter, hidden behind the 1.25" adapter.
The thread is again the friendly T2

Image



The view through the front assembly shows a purple cast, in accordance with the curve of these filters, posted on this forum
The picture is "quickly" taken with a smart phone.

Image



The view through the rear assembly shows the famous yellow-green cast, in accordance with the description posted on this forum
The picture is "quickly" taken with a smart phone.

Image



For reference, here is a picture taken through a Baader K-Line
Strong prefiltrer, isn't it …

Image

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Re: Lunt CaK B1800, inside visual inspection

Post by marktownley » Mon Mar 12, 2018 9:00 pm

Thanks for the inside view Alex
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!

allhoest
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Re: Lunt CaK B1800, inside visual inspection

Post by allhoest » Sat Mar 31, 2018 9:15 pm

So, I gave a try with this CaK filter. I used a NP101 for this first light.
First, with no barlow, but then I had only phantom reflections:
Image

Then I used a barlow. Results are here:
viewtopic.php?f=4&t=24259


CS
Alex

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Re: Lunt CaK B1800, inside visual inspection

Post by Charon_X » Fri Apr 06, 2018 8:48 pm

The Lunt CaK module have a serial number ?

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Re: Lunt CaK B1800, inside visual inspection

Post by allhoest » Sun Apr 08, 2018 3:18 pm

There is no serial number on mine.
But as we know that there are variations in filter making process, that would be a good thing.

CS
Alex

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Re: Lunt CaK B1800, inside visual inspection

Post by allhoest » Sat May 26, 2018 7:03 pm

Indeed, the picture are gone.
Here, I repost every description, one by one.
CS
Alex


===========================
The filter, side and top views
Attachments
20180303_008_Overview Top_enh.jpg
20180303_008_Overview Top_enh.jpg (102.85 KiB) Viewed 1032 times
20180303_001_Overview Left_enh.jpg
20180303_001_Overview Left_enh.jpg (166.26 KiB) Viewed 1032 times

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Re: Lunt CaK B1800, inside visual inspection

Post by allhoest » Sat May 26, 2018 7:03 pm

The diagonal assembly.
The allen heads are metric (!).
The screws were not tight fasten; some were even lose. Why? For any mirror compression issues? The mirror is fixed by some material, glue-foam probably. It can freely move, expand.
Attachments
20180303_015_Diagonal Mirror_enh.jpg
20180303_015_Diagonal Mirror_enh.jpg (209.78 KiB) Viewed 1032 times

allhoest
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Re: Lunt CaK B1800, inside visual inspection

Post by allhoest » Sat May 26, 2018 7:05 pm

The diagonal itself is manufactured from a plain bloc.


My fear was that the mirror would be somehow treated, for dimmer reflection, like the blocking filters of coronado.
I have no real mean to measure the reflected flux, but while pointing the mirror toward the sun, plenty of light is reflected.
Attachments
20180303_022_Diagonal mirror reflection OK_enh.jpg
20180303_022_Diagonal mirror reflection OK_enh.jpg (77.94 KiB) Viewed 1032 times
20180303_021_Diagonal manufacture_enh.jpg
20180303_021_Diagonal manufacture_enh.jpg (175.16 KiB) Viewed 1032 times

allhoest
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Re: Lunt CaK B1800, inside visual inspection

Post by allhoest » Sat May 26, 2018 7:06 pm

The front filter.
Sorry, I didn't feel the need to dismantle it…

The front assembly can be simply unscrewed. No need to take out the allen screws. It is a T2 thread.
Attachments
20180303_012_Front Filter_enh.jpg
20180303_012_Front Filter_enh.jpg (106.48 KiB) Viewed 1032 times
20180303_024_Fromt part assembly_enh.jpg
20180303_024_Fromt part assembly_enh.jpg (171.84 KiB) Viewed 1032 times

allhoest
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Re: Lunt CaK B1800, inside visual inspection

Post by allhoest » Sat May 26, 2018 7:08 pm

The view to the intermediate filter shows some deposit on it. It looks terrible on the picture, because of the angle of view. But as we will see later, we can see something through it.
Finally, maybe I should dismantle these front assembly filters, for inspection.



The connecting part of the front assembly has an aperture of about 18mm
Attachments
20180303_027_Intermediate filter_enh.jpg
20180303_027_Intermediate filter_enh.jpg (90.55 KiB) Viewed 1032 times
20180303_041_The aperture of the diagonal is ~18mm_enh.jpg
20180303_041_The aperture of the diagonal is ~18mm_enh.jpg (152.48 KiB) Viewed 1032 times

allhoest
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Re: Lunt CaK B1800, inside visual inspection

Post by allhoest » Sat May 26, 2018 7:09 pm

The rear assembly shows the 3rd filter, hidden behind the 1.25" adapter.
The thread is again the friendly T2
Attachments
20180303_011_RearOuput & Filter - T2 therad + 1.25 adapter_enh.jpg
20180303_011_RearOuput & Filter - T2 therad + 1.25 adapter_enh.jpg (172.17 KiB) Viewed 1031 times

allhoest
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Re: Lunt CaK B1800, inside visual inspection

Post by allhoest » Sat May 26, 2018 7:11 pm

For reference, here is a picture taken through a Baader K-Line
Strong prefiltrer, isn't it …
Attachments
20180303_032_View through a Baader KLine_enh.jpg
20180303_032_View through a Baader KLine_enh.jpg (58.9 KiB) Viewed 1031 times

allhoest
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Posts: 207
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Re: Lunt CaK B1800, inside visual inspection

Post by allhoest » Sat May 26, 2018 7:15 pm

The view through the rear assembly shows the famous yellow-green cast, in accordance with the description posted on this forum
The picture is "quickly" taken with a smart phone.
Attachments
20180303_037_View through the rear assembly_enh.jpg
20180303_037_View through the rear assembly_enh.jpg (135.89 KiB) Viewed 1031 times

allhoest
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Re: Lunt CaK B1800, inside visual inspection

Post by allhoest » Sat May 26, 2018 7:17 pm

2018May26 - Additional notes

I couldn't remove the adapter holding the 3rd filter.
Indeed, the parts connected to the diagonal look to be glued.

Image

CS
Alex

allhoest
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Posts: 207
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Re: Lunt CaK B1800, inside visual inspection

Post by allhoest » Sat May 26, 2018 7:18 pm

The view through the front assembly shows a purple cast, in accordance with the curve of these filters, posted on this forum
The picture is "quickly" taken with a smart phone.
Attachments
20180303_035__View through the front assembly_enh.jpg
20180303_035__View through the front assembly_enh.jpg (98.92 KiB) Viewed 1031 times

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