Very nice portrait and expression.
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Very nice portrait and expression.
Wow.With only a few exceptions (Phase One P+ Kodak sensors, IQ260), MF CCD backs in general, and especially older ones like my Kodak DCS645M, have truly awful long exposure dark noise, which corrodes image quality even with automatic dark-frame subtraction engaged.
So what do you do in enforced low-light long exposures, when the signal is only trickling in while the noise is building up to ridiculous levels? Mod your system to build the signal up to ridiculous levels as well! Admitting all the near infrared spectrum boosts signal by a large multiple in a Kodak CCD. All I have to do with my DCS645M is click off the removable IR-block filter.
In practice, the small focus shift due to IR wavelengths now dominating seems to cancel out the small focus shift due to removing the glass filter from the front of the DB.
So here's the Teapot and the summer Milky Way in Visible + IR [predominantly IR]. This reminds me of old hypered Tech Pan shots with a deep red filter, except here it's actually in colour: the little nebulae are reddish due to the 656 nm Hydrogen line. The star-clouds and interstellar dust clouds are more structured in IR than they would be in the visible.
Ray
Hi Gerald,Wow.
Ray - I'm very intrigued by your comment about the images being predominantly in the IR. I've not really done any astrophotography but the bug is nibbling me.
Would I get decent results with an Achromatic+ with a Heliopan IR780 do you think?
I'm probably going to get out into the desert this weekend and have another play with the Sony A7s, and perhaps I should take the Achromatic+ along with me also?
Kind regards,
Gerald.