Lunt CaK B1800, inside visual inspection
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Lunt CaK B1800, inside visual inspection
Hi!
I just bough a one of these CaK; here is the first inspection.
CS
Alex
The filter, side and top views
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.
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.
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.
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
The rear assembly shows the 3rd filter, hidden behind the 1.25" adapter.
The thread is again the friendly T2
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.
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.
For reference, here is a picture taken through a Baader K-Line
Strong prefiltrer, isn't it …
I just bough a one of these CaK; here is the first inspection.
CS
Alex
The filter, side and top views
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.
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.
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.
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
The rear assembly shows the 3rd filter, hidden behind the 1.25" adapter.
The thread is again the friendly T2
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.
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.
For reference, here is a picture taken through a Baader K-Line
Strong prefiltrer, isn't it …
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Re: Lunt CaK B1800, inside visual inspection
Thanks for the inside view Alex
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!
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Re: Lunt CaK B1800, inside visual inspection
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:
Then I used a barlow. Results are here:
viewtopic.php?f=4&t=24259
CS
Alex
First, with no barlow, but then I had only phantom reflections:
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
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
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
Indeed, the picture are gone.
Here, I repost every description, one by one.
CS
Alex
===========================
The filter, side and top views
Here, I repost every description, one by one.
CS
Alex
===========================
The filter, side and top views
- Attachments
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- 20180303_008_Overview Top_enh.jpg (102.85 KiB) Viewed 6927 times
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- 20180303_001_Overview Left_enh.jpg (166.26 KiB) Viewed 6927 times
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Re: Lunt CaK B1800, inside visual inspection
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.
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
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- 20180303_015_Diagonal Mirror_enh.jpg (209.78 KiB) Viewed 6927 times
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Re: Lunt CaK B1800, inside visual inspection
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.
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
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- 20180303_022_Diagonal mirror reflection OK_enh.jpg (77.94 KiB) Viewed 6927 times
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- 20180303_021_Diagonal manufacture_enh.jpg (175.16 KiB) Viewed 6927 times
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Re: Lunt CaK B1800, inside visual inspection
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.
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
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- 20180303_012_Front Filter_enh.jpg (106.48 KiB) Viewed 6927 times
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- 20180303_024_Fromt part assembly_enh.jpg (171.84 KiB) Viewed 6927 times
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Re: Lunt CaK B1800, inside visual inspection
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
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
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- 20180303_027_Intermediate filter_enh.jpg (90.55 KiB) Viewed 6927 times
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- 20180303_041_The aperture of the diagonal is ~18mm_enh.jpg (152.48 KiB) Viewed 6927 times
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Re: Lunt CaK B1800, inside visual inspection
The rear assembly shows the 3rd filter, hidden behind the 1.25" adapter.
The thread is again the friendly T2
The thread is again the friendly T2
- Attachments
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- 20180303_011_RearOuput & Filter - T2 therad + 1.25 adapter_enh.jpg (172.17 KiB) Viewed 6926 times
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Re: Lunt CaK B1800, inside visual inspection
For reference, here is a picture taken through a Baader K-Line
Strong prefiltrer, isn't it …
Strong prefiltrer, isn't it …
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- 20180303_032_View through a Baader KLine_enh.jpg (58.9 KiB) Viewed 6926 times
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Re: Lunt CaK B1800, inside visual inspection
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.
The picture is "quickly" taken with a smart phone.
- Attachments
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- 20180303_037_View through the rear assembly_enh.jpg (135.89 KiB) Viewed 6926 times
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Re: Lunt CaK B1800, inside visual inspection
2018May26 - Additional notes
I couldn't remove the adapter holding the 3rd filter.
Indeed, the parts connected to the diagonal look to be glued.
CS
Alex
I couldn't remove the adapter holding the 3rd filter.
Indeed, the parts connected to the diagonal look to be glued.
CS
Alex
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Re: Lunt CaK B1800, inside visual inspection
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.
The picture is "quickly" taken with a smart phone.
- Attachments
-
- 20180303_035__View through the front assembly_enh.jpg (98.92 KiB) Viewed 6926 times