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MartinFransson

Simeis 147 (WIP)

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Well, I need a lot more data for this one! Anyway, here is a try at bicolour image of Simeis 147 - the Spaghetti Nebula.

67*5 minutes of 3nm Ha and 27*5 minutes of 3nm O3.
Samyang 135/2.0 lens @f/4.
ZWO ASI1600MM-Cool

Ha67x5-O3-27x5-bicolour.jpg

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Data shortage or not, that’s pretty damn good! I’d be more than happy with that. 

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May I ask why you shoot at F4 with the Samyang rather than the option for F2,  which would reduce the amount of exposure time (especially with narrow-narrow band filters) ??

(  BTW ....Spectacular image as it stands ).

 

Sean.

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26 minutes ago, Craney said:

May I ask why you shoot at F4 with the Samyang rather than the option for F2,  which would reduce the amount of exposure time (especially with narrow-narrow band filters) ??

(  BTW ....Spectacular image as it stands ).

 

Sean.

I just don´t get sharp stars in the corners at f/2. Even at f/2.8 I get some elongated stars in the corners.

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Excellent image Martin, will look really great with some more subs!

I'm thinking of going the Samyang 135 route,just love the FOV and image quality - would be interested to know / see what your set-up looks like + any advice ?  

Given your comments regarding f2 v f4 - does that mean you always image at f4 or are there objects that work at the wider aperture?

Graham

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2 hours ago, groberts said:

Excellent image Martin, will look really great with some more subs!

I'm thinking of going the Samyang 135 route,just love the FOV and image quality - would be interested to know / see what your set-up looks like + any advice ?  

Given your comments regarding f2 v f4 - does that mean you always image at f4 or are there objects that work at the wider aperture?

Graham

It means I image at f/4, sometimes at f/2.8. I might have a less than perfect copy of the lens or something because I´ve seen people imaging at f/2.

Here are a few photos of how I set up. One with the Samyang and one with how I mount together with the guide scope. But in that picture it´s the Canon 300/4L lens I use :)

IMG_8595.jpg

IMG_9425.jpg

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Thanks Martin, that's very helpful - think I'm sold on the Samyang 135 for astrophotography, love the big picture it achieves.

Any tips on focussing, I've always battled with this using a camera lens? 

Graham

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41 minutes ago, groberts said:

Thanks Martin, that's very helpful - think I'm sold on the Samyang 135 for astrophotography, love the big picture it achieves.

Any tips on focussing, I've always battled with this using a camera lens? 

Graham

These are the solution to that :)

https://www.teleskop-express.de/shop/product_info.php/language/en/info/p3286_TS-Optics-Microfocuser-for-your-camera-lens-up-to-135-mm-Diameter.html

 

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Thanks again, much appreciated.

Graham

 

Edited by groberts

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Your image is superb. You make me want to try some wide field imaging.

I have the ASI1600MM and the EFW.

What version of the Samyang did you use ( Canon - Nikon ? ) and what adapter to connect to the filter wheel?

 

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2 hours ago, wornish said:

Your image is superb. You make me want to try some wide field imaging.

I have the ASI1600MM and the EFW.

What version of the Samyang did you use ( Canon - Nikon ? ) and what adapter to connect to the filter wheel?

 

I have the Canon version and I use the ZWO lens adapter for Canon lenses.

https://astronomy-imaging-camera.com/product/new-eos-lens-adapter-for-efw

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Excellent Martin, the OIII is popping out really nicely.  The 135mm lens frames this object perfectly.

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