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EAA with photographic lens for big celestrial objects

CMOS EAA dso equipment
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#1 GazingOli

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Posted 15 August 2020 - 02:04 AM

Hello everybody,

 

even though I am aware that there is a thread on IP/CCTV lens for RT224 camera (https://www.cloudyni...mera/?p=8485988) I decided to make a new thread on the more general topic of trying to reach big celestrial objects with EAA.

 

Therefore I bought a used photographic lens for 25 Eur in order to use it with my ZWO ASI 224 - will that work?

 

001cameraandlens.jpg

 

To put everything together I needed an adapter M42 / T2 (different thread pitch?) and some T2 spacers:

 

002DSC03267kl.jpg

 

This was easy

 

003DSC03253kl.jpg

 

 

...

 

 

 


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#2 GazingOli

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Posted 15 August 2020 - 02:08 AM

as the camera comes with a M5 thread on the back center I could simply bolt it to my custom "mount" which I made out of some leftover wood pieces

 

004DSC03252kl.jpg

 

the idea was to just do some testing out of the window

 

005DSC03256klein.jpg

 

 

 

 



#3 UT_JimW

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Posted 15 August 2020 - 02:10 AM

Well, it looks interesting.  Show some samples of what you got when trying it.



#4 GazingOli

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Posted 15 August 2020 - 02:14 AM

later I would mount the set to my CPC800 - just using a shelf bracket and a selfmade adapter for the finder shoe - simple as can be

 

006.20200804_112702kl.jpg

 

 



#5 GazingOli

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Posted 15 August 2020 - 02:21 AM

Thank you Jim, that is exactly my intention!

 

I had one shot on the moon, which was soso...

 

008mondCapture_00003.jpg

 

Yesterday I could at least do some testing to figure out the focus and try live stacking. Everything works fine so far. Unfortunately I could not see any interesting object - too many clouds.

 

First thing I realized was that the stars are too blurry if I work with f/1.7 it looks much better with f/5.6

 

Maybe tonight I will have better weather and the chance to try on some of the big objects like M31 and NGC 7000. I hope I am not to enthousiastic to try on those two for a beginning wink.gif

 

CS.Oli


Edited by GazingOli, 15 August 2020 - 03:56 AM.

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#6 GazingOli

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Posted 15 August 2020 - 02:28 AM

This war Altair from last night, I guess with f/1.7 still

 

007 Altair Stack_9frames_23s_WithDisplayStretch.jpg

 

not too bad... more to come



#7 GazingOli

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Posted 15 August 2020 - 07:37 PM

M16uM17 t Stack_13frames_39s_WithDisplayStretch.jpg

 

from last night... I must admit that I am not too enthousiatic about this. With my CPC800 and also with my custom triplet apo I have a lot of fun in EAA, this one is a little disappointing so far. I will try with a infrared cut filter.

 

CS.Oli


Edited by GazingOli, 15 August 2020 - 07:46 PM.


#8 cmooney91

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Posted 15 August 2020 - 08:16 PM

Nice! Looks like a lot of fun. 

 

A UV-IR cut filter might help sharpen the view(maybe?). The CMOS sensors have some sensitivity into the IR, old film was not sensitive to it, and modern daylight consumer cameras have built-in IR block filters. This means the the camera lens do not have to correct the IR component of the light, but our unfiltered astro cameras can pick up the unintended rays. 

 

Might help, might not. 



#9 GazingOli

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Posted 16 August 2020 - 01:32 AM

Nice! Looks like a lot of fun.

not even funny ... I prefer results like this: https://www.cloudyni...ery/?p=10424287

 

I will try with some other objects and an IR cut filter for the ASI 224 is only 22 EUR, so I will get that, too. I will need it anyway. But if I do not get significantly better results, I will let the 50 mm aside and concentrate on the real fun stuff, which is the CPC800 and the 80/480 triplet apo refractor.

 

CS.Oli


Edited by GazingOli, 16 August 2020 - 01:33 AM.


#10 alphatripleplus

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Posted 16 August 2020 - 07:57 AM

I use fast camera lenses, but with a narrowband H-alpha filter and mono camera just for emission nebulae. Chromatic aberration with my fast old camera lenses is apparent with just a UV/IR filter because a UV/IR still transmits over several 100nm bandwidth. I've got better results combining  a #29 Deep Red filter with a UV/IR filter - which transmits from roughly 600nm - 670 nm, but exposures are longer. After a lot of experimentation, I settled on a 7nm H-alpha filter plus mono camera, as there are no chromatic aberration issues if you are just capturing at essentially one wavelength, but you are pretty much limited to emission nebulae. (It will also show stars in clusters, but with much longer exposures.)

 

With a colour camera, you will see something using a H-alpha filter (I did when I used to have an ASI224MC), but the Bayer Matrix will make it much, much less sensitive than a mono camera and H-alpha filter.


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#11 GazingOli

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Posted 04 September 2020 - 07:39 PM

last night I could do some more testing with this set up. I managed to adapt an UHC filter which improved the results significantly:

 

M16M17 50mmUHC ASI224 31frames_93s.jpg

 

this was taken fully static! 31 frames 3 s each, the focal ratio of the lens was set to f/4. The image is cropped an resized.

 

M24M25M17 50mmUHC ASI224 _14frames_42sTXT.jpg

 

This one was only rezised. Therefore you can see the drift.

 

I also tried the Veil Nebula but did not succeed, I guess because of the bright Moon coming up.

 

Now this is starting to become fun!

 

CS.Oli


Edited by GazingOli, 04 September 2020 - 07:41 PM.

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#12 JMW

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Posted 06 September 2020 - 09:40 AM

I recently bought an ASI2600MC-P so I freed up my ASI1600MC-Cool. I attached it to a Rokinon 85mm f/1.4 using the EOS adapter. It Is mounted on top of my SVR102T which is a attached to the ASI2600MC-P. This gives me a very wide imager along with my main imaging scope.

 

I set it up as an E-Finder but it will work for wide-fields also. My little guide scope with mini guide camera is mounted under the bracket holding the ASI1600/Rokinon 85mm. The camera under the saddle plate is a WIFI 4K camera used as a mount point of view camera to show me the location of where the mount is pointed. I can see the trees, rooftops, clouds that may be interfering with the views. It has an IR emitter but I leave it turned off.

Attached Thumbnails

  • MountCams.jpg

Edited by JMW, 06 September 2020 - 09:41 AM.

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#13 cmooney91

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Posted 06 September 2020 - 02:48 PM

I finally pulled the trigger on a Rokinon Cine DS 85mm T1.5 from Amazon. It arrived today.

 

I opened the box to find my "new" lens was a returned open box item, and the previous owner thoughtfully decided to keep the lens cap, so it was shipped with the front element pressing against the plastic bag, bearing directly on the packaging foam. Now the front element is all buffed from shipping vibrations.

 

So disappointing, and the worst thing is when I return it for the damage, amazon will probably just sell it to someone else.  What a waste of the nice looking lens.



#14 GazingOli

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Posted 07 September 2020 - 12:35 AM

Sorry for you!

 

CS.Oli



#15 GazingOli

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Posted 10 September 2020 - 12:44 AM

so I did it again...

 

M31 50mm UHC ASI224 65frames_520s.jpg

 

and NGC700

 

NGC7000 50mm UHC ASI224 34frames_544s.jpg

 

Veil Nebula was not possible for me

 

Conclusion so far: the image scale of this setup is about 15 px per arcsec which you can see clearly in resolution. For a good image quality you need a decent image scale which requires a high-res camera with a bigger sensor and a pairing scope to make it fun.

 

CS.Oli


Edited by GazingOli, 10 September 2020 - 12:45 AM.

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#16 GazingOli

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Posted 10 September 2020 - 12:54 AM

Just to compare: this is what I got the night before from my 80/480 Olifractor apo with UHC filter at the ASI224, when I shot at M31

 

M031 Olifraktor UHC ASI22 424frames_384s.jpg

24 x 16 s resized to 800 px width

 

Looks like a lot of more fun to me!

 

CS.Oli



#17 GazingOli

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Posted 17 September 2020 - 11:27 PM

another test this morning - first time ever Flame Nebula and Horse Nebula. Not a nice photo yet a nice experience for me.

 

HoreseheadFlame 50mm UHC ASI224 31frames_124stxt.jpg

 

CS.Oli

 

 


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