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Join our unique resource for Olympus Four Thirds E-System DSLR and Pen and OM-D Micro Four Thirds photographers. Show your images via our free e-group photo gallery. Please read the e-group.uk.net forum terms and conditions before posting for the first time. Above all, welcome!


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Foto Fair Post your photos for friendly, non-critical feedback. This is the place to show pictures if you aren't yet ready for full-blooded critique, or simply want to share an interesting picture with other e-group visitors.

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  #211  
Old 16th February 2019
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Re: Communal Night-Sky Photography Thread

That's a fabulous image Dave. It's the same as the image on the front of my Atlas of the Universe by Sir Patrick Moore. His seems to be a mirror image of yours.
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  #212  
Old 16th February 2019
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Re: Communal Night-Sky Photography Thread

Thanks. Not sure why its a mirror image perhaps it was taken using a reflector rather than a refractor scope. It's about 1350 light years away so not sure which way is up or down or left or right, it depends on when and where you are on earth when you look. My image seems to be the same as that in Wikipedia.
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  #213  
Old 16th February 2019
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Re: Communal Night-Sky Photography Thread

Quote:
Originally Posted by wornish View Post
......I was out last night with my scope for the first time this year...........
A super image

I notice a slight overall 'cross-hatch' effect on the image, when viewed on my monitor, as though taken through a net curtain.

I recall getting similar effects when I had a low quality UV filter on one of my Nikon tele-lenses. These artefacts may arise either from the software processing or from the various filters you used in creating the image
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Old 16th February 2019
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Re: Communal Night-Sky Photography Thread

Quote:
Originally Posted by MikeOxon View Post
A super image

I notice a slight overall 'cross-hatch' effect on the image, when viewed on my monitor, as though taken through a net curtain.

I recall getting similar effects when I had a low-quality UV filter on one of my Nikon tele-lenses. These artefacts may arise either from the software processing or from the various filters you used in creating the image
Thanks.

Yes, I can see the cross-hatching on here as well. I think it might be something to do with the image compression used on this site.

The problem is not due to the filters. If you look at my image on Flickr it's not there at all, luckily. When I look at the full size one in PS its not there either.

UPDATE.
I remembered I had reduced the size of the image twice before posting on here I think that's what produced the artifacts. Anyway, I have now replaced the image on my post above with a clean one no artifacts.
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  #215  
Old 16th February 2019
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Re: Communal Night-Sky Photography Thread

Dave maybe the reversal is a cock up in the printing
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  #216  
Old 16th February 2019
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Re: Communal Night-Sky Photography Thread

While browsing the night sky with the 'Stellarium' program, I noticed that Uranus is quite close to Mars at present.

With Mars forming an easy aiming point, I decided to see if could also capture the more distant planet, I find the Olympus EE-1 dot sight is very useful for quickly lining up onto a specific object in the night sky. The result, obtained using my 75mm f/1.8 lens, wide open is shown below:



I didn't do enough homework since, looking at Stellarium again, later, I noticed that one of the Iridium satellites passed between Mars and Uranus, shortly after I took my photo!

I'm gradually working up my technique to have a go at deep-space objects and one topic I investigated was the use of a dark frame (taken with the lens cap on) to capture hot pixels and other fluctuations on the sensor. When I looked at these images, I found one particularly bright red pixel near the centre of the frame. On an 'out of camera' JPEG it appeared as a fuzzy blur when viewed at 1:1 magnification on screen.

In an earlier post, I looked at the effects of using different raw conversion algorithms and concluded that, in practice, the differences seemed quite small. When I zoomed-in on the hot pixel, however, and tried the various algorithms provided in the 'Raw Therapee' software, the differences were considerable. Some algorithms smear the hot pixel in various ways, whereas others do not.

The most common algorithms are tuned to suit photography of multi-toned subjects, whereas points, such as stars, are very different. From my results, the algorithms vary considerable in their ability to handle individual bright spots. In fact, using no de-mosaic at all but just showing the individual filtered pixels appears to do very well on a bright single-colour spot but, of course cannot render gradual tonal changes across an image.




The above are high magnification views of the same raw data (so that individual pixels can be seen), each using a different algorithm to create the screen image.
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  #217  
Old 17th February 2019
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Re: Communal Night-Sky Photography Thread

Had a go at the moon earlier. This is a grab from the jpg file using aviary on my tablet. Might just have to have a look at the raw file.

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  #218  
Old 17th February 2019
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Re: Communal Night-Sky Photography Thread

Here is the raw version processed in Lightroom.



Quite pleased with that one actually. Probably one of the best I've managed with the 40-150 plus 1.4tc hand held.
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Old 17th February 2019
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Re: Communal Night-Sky Photography Thread

Very nice indeed.
It's always harder to get the detail as the moon gets nearer to a full moon but this is great.
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  #220  
Old 17th February 2019
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Re: Communal Night-Sky Photography Thread

I agree with Dave, excellent shot Phill.
One from the command module window
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  #221  
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Re: Communal Night-Sky Photography Thread

Tonights Moon

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  #222  
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Re: Communal Night-Sky Photography Thread



Another Moonshot...........
by Mark Johnson, on Flickr

Beat me to it Dave......
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  #223  
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Re: Communal Night-Sky Photography Thread

Managed to get 1 1/2 hours worth of narrowband imaging of Horsehead and Flame Nebula last night. R,G,B, and Hydrogen Alpha. As always need lots more data.



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Last edited by wornish; 4 Weeks Ago at 10:42 AM. Reason: Updated image
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Re: Communal Night-Sky Photography Thread

Another front cover shot Dave, this time from "The Backyard Astronomer's Guide" and not reversed . This is professional level stuff Dave marvellous image.
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  #225  
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Re: Communal Night-Sky Photography Thread

Thanks, Phil I try but it needs at least 4 hours worth of data to get to the pro standard. There is a lot of noise in the image.

Last night I was doing well but dew was building up on my laptop and I decided to call it a night about 11:00 pm. It takes about 45mins to set up and align everything and then another 20minutes to take it all down so that adds to the challenge.
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