AstroBin

AstroBin

AstroBin

New travel setup based around Takahashi FS-60CB Takahashi FS-60CB · Willem Jan Drijfhout · ... · 31 · 1669 · 15

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I have now reached the point where I have already been able to make some tests.
As I have indicated before, it is not easy to find adapters that are suitable for Takahashi.
Taking into account that I need to get a metal backspace of 56.2mm
I currently have a backspace of 57mm, but that can be reduced if necessary.
I have now purchased the following parts:

-Takahashi 0.72 reducer
-Zwo filter drawer with cls filter
-Zwo OAG
-ZwoEAF
-Zwo asi585mc
-Zwoasi715mc
-2mm Optique-Underlinden adapter ring
-Takahashi CAA
rsz_img_2593.jpg


As you can see below, I did some tests on a tree from 200 meters away
Preview_M42_100.0ms_Bin1_585MC_gain0_20250206-170012_13.8C.jpg

Preview_M42_20.0ms_Bin1_585MC_gain0_20250206-151349_13.6C (1).jpg​​​​​​​
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Wjdrijfhout 6.78
Willem Jan Drijfhout
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Looking good, Gio!  At this point I would not worry too much about the 56.2 vs 57. Best is to take a shot of a star field, look at the star shapes and go from there.
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Willem Jan Drijfhout:
Looking good, Gio!  At this point I would not worry too much about the 56.2 vs 57. Best is to take a shot of a star field, look at the star shapes and go from there.

Thank you for your compliment Willem Jan.
So far I have only tested at dusk and am still waiting for clear weather, then I will point the scope towards the sky.
Unfortunately I only have forest on the north side where I live, so I can't aim at Polaris
That's why I'm going to test plate-solving right away.....
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Last week I was able to test my setup towards the sky for the first time after a long period of cloud cover
the downside was that the moon was a spoilsport. I used plate solving because polaris was out of range.
the result is not amazing, but that will improve...

IMG_0058.jpg
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Wjdrijfhout 6.78
Willem Jan Drijfhout
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Glad you got your first light in, Gio! You’re off to a promising start. Did you use any filters? If you want to have less interference of the moon, you can use for example a dualband filter. The Rosette nebula is a great target for dual band filters.
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Thank you Willem Jan!…. Unfortunately I have never heard of a dual band filter..
I have been told that I should use a cls filter because of light pollution.
I did that too, from the Optolong brand.

The stars in the photo are a bit blurry
In addition I understand that a Bahtinov mask is a perfect tool for focusing,
because it is quite difficult without…..
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Wjdrijfhout 6.78
Willem Jan Drijfhout
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A CLS filter blocks certain wavelengths that are typical in environmental light pollution (e.g. sodium lamps). You get a normal colour (RGB) image, but usually with a bit more contrast.
A dual band filter blocks all wavelengths, with the exception of two very specific ones. The ones it lets through are usually referred to as OIII and H-alpha. This light is associated specifically with many nebulous targets in the night sky, such as your Rosette nebula. It is a form of narrowband imaging. There are tons of videos on narrowband imaging on YT. For example the ones from Lunatico or Astrobackyard are usually pretty good. The moon does not specifically emit OIII or H-alpha light, so many people use narrowband imaging to battle the light pollution from the moon.

Best regards, Willem Jan.
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