RBA & AF Astrophotography

Sleepy astrophotography: Comments

Adam Nemec (Contact, Page), January 4th, 2011, 10:10

As someone who specializes in daytime photography (with a bent on HDR for the past 8 years) I wholeheartedly agree.

However, I started doing astrophotography just about a year ago and attempted several HDR images of M42 specifically using the techniques and software (Photomatix, Photoshop) I rely on for daytime shots, but with mediocre to poor results. This may have been because I was so new to this field and had not really figured out the equipment (specifically fine-tuning my mount and guiding). But even recently as my skill and understanding has progressed significantly I have still been disappointed with the blending of something like various exposures of M31 to draw out the core. Perhaps Photomatix is not ideal. Perhaps I am not correctly calculating my exposure lengths to truly draw out the HDR.

How do you calculate your exposure lengths for things like the M42 trapezium area?

RBA (Contact, Page), January 7th, 2011, 5:25

Hi Adam.
One should be able to do a nice HDR composition just by taking one set of exposures as short as 10~20 seconds merged with longer exposures of over 5 minutes. Of course you can do more elaborated compositions with an intermediate set, say with exposures within 1 minute, but with just two sets it should still work.

I wouldn't recommend using software like Photomatix, and instead use more specialized software for astroimaging that also has HDR composition capabilities, such as PixInsight.

zoila miranda (Contact, Page), January 7th, 2011, 5:55

Hola Rogelio, se terminů La FADD?

Adam Nemec (Contact, Page), January 7th, 2011, 8:32

Thanks Rogelio.

I have been contemplating the move to PixInsight for several months now. I did the free trial and liked it, though the learning curve seems a bit steep. But then again, what part of this hobby doesn't have a steep learning curve.

Photoshop is great, but the specialized nature of PixInsight makes it intriguing. I found that for daytime photography using Photomatix, which is a specialized software specifically for HDR compositions, produced images which were dramatically better than using the HDR features supplied within PS. Which makes me think that PixInsight will be much the same.

So it looks like I know what my next software purchase will be. Keep up the amazing and inspirational work.

rob (Contact, Page), March 19th, 2011, 11:31

i've successfully used the free software called enfuse to do HDR compositions of M42. now of course i use pixinsight. adam, if you are still reading this you might give enfuse a try. in my case, instead of feeding it linear images i did about 10 stretches of the same data and it did a very good job of picking the un-overexposed pixels from each image.

david (Contact, Page), October 14th, 2019, 6:15

In a way, I think this is more than just a conversation between using an HDR tool and copying / pasting / blending.When it comes to astroimage processing, we shouldn't assume that everything has already been invented and that the only way this hobby can advance is through optics and particularly CCD technology.

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