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GiorgioF

IC1396 with Nikon lens

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Cheers.

Here 5 hours of Ha for this nebula.

While quite satisfied by the nebulosity is a pain for me about the stars. The corners are showing all the weak part of the setup.

Looking for advice if someone is using a similar setup.

ASI1600mm, baader Ha 7nm, light of 300" and 600" (different sky conditions in different nights).

Lens Nikon 80-200 f2,8 closed to f5,6.

Process all in Pixinsight.

Thanks for your help

IC1396 -WEB.jpg

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I feel your being a bit hard on yourself, this is a very good image, Nikon lenses are I am sure as good as my Canon lenses, my only gripe about using them is the spikes, though I have to say yours seem nicer than the time I used my 300mm f2.8.

Alan

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I agree with Alan.

you are being hard on yourself. 

Thats a fab image with loads of great detail, I wouldn’t have expected that from a zoom lens?! 

Thanks for sharing 

Bryan 

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Thank you Alan and Brian. To kind words.

I'm always looking for high target and yes, sometimes it deal to be a little hard in judge my works. Maybe also as professional habit ;).

I hope to get some oxigen if the weather will cooperate. The aim was to get a bicolour image.

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Excellent.  Stars look fine to me, but I see what you mean about the spikes.

Carole 

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I agree, it's an excellent image. 

Excuse my ignorance, but what causes that type of diffraction spikes? The lens iris? 

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The 80-200 f2.8 is one of the sharpest zooms ever made. Modern lenses can't come close. However, it wasn't meant for astro and many Nikon lenses suffer from coma - it's not a design priority.

The diffraction spikes are due to the 9 bladed diaphragm. You are better off making a manual stop for the front of the lens so you can use it wide open.

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2 hours ago, Mr Spock said:

The 80-200 f2.8 is one of the sharpest zooms ever made. Modern lenses can't come close. However, it wasn't meant for astro and many Nikon lenses suffer from coma - it's not a design priority.

The diffraction spikes are due to the 9 bladed diaphragm. You are better off making a manual stop for the front of the lens so you can use it wide open.

Uhm.....the manual iris sounds quite nice.

But should say the spikes are not a disturbing factor than the elongated stars.

Will work about....

Ps.yes, it's really one of the sharpest lens.

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I use vintage film SLR camera lenses - Asahi Optical - Takumar, Super Takumar and SMC Takumar as were used on Pentax cameras.  These can be bought cheaply second hand and are excellent quality.  I use them at full aperture and hence avoid spikes caused by the aperture iris blades.

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5 hours ago, Mr Spock said:

The 80-200 f2.8 is one of the sharpest zooms ever made. Modern lenses can't come close. However, it wasn't meant for astro and many Nikon lenses suffer from coma - it's not a design priority.

The diffraction spikes are due to the 9 bladed diaphragm. You are better off making a manual stop for the front of the lens so you can use it wide open.

Ah yes, OK. Nice little explanation here as to why an odd number of blades produces twice as many spikes as blades. https://en.m.wikipedia.org/wiki/Diffraction_spike#Diffraction_spikes_due_to_non-circular_aperture

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