Here is a happy snap I captured this week.
The image on the left is without flats, on the right with flats.
Think the flats I captured wernt any good as its making the corners bright.
A lot of yellow was removed using background extractor in pixinsight but I feel I can get better results with a filter as the image does look a little flushed out.
Thoughts?
Quote:
Originally Posted by JA
I would say it's a little unusual to notice a yellowish tinge unless you are shooting a nightscape at much a wider angle than available with a 135mm lens on a crop sensor camera. Just checking - Are you sure your white balance is set correctly to Daylight? Still it might be just that way. Certainly if you look at the street lights and they are yellow/orange then it's likely its a high pressure sodium lamp, whose light can be tamed somewhat with a Neodymium type filter, sometimes called didymium or redhancer, red-intensifier filters. The best that I've tried / seen is the Marumi ? Crystal Optics brand. Hoya also make a type, but I've tried those and they don't cut as much as the Marumi nor is the contrast as good. There are other Astro brands too with similar filters, sometimes called skyglow filters as well as other types, which sometimes create a significant colour cast, so try first if possible. There are more expensive name brands also available such as Baader and IDAS, etc...
For now use your DSLR as is, nice and portable as you say, and try to get somewhere dark to see what's possible before buying new gear. A modified DSLR will get you over twice as much exposure as an unmodified DSLR (~65% transmission Versus ~25% transmission of Hydrogen Alpha) , but really ONLY in the Hydrogen ALpha wavelengths / deep reds. There's still plenty to capture using an unmodified DSLR and its more muted (only in the deep reds) RGB sensor if you go for broadband targets. If you're thinking of a new camera at some stage, some of the FujiFilm mirroless cameras have excellent Hydrogen Alpha Response (~45% transmission) in their standard (unmodified state). I'm not sure if that's across all models or just the earlier models like the Pro1 and X-E1.
Best
JA
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