Lunt CaK B1800, inside visual inspection
Posted: 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
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 …