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 Post subject: Is this double exposure?
PostPosted: Thu Aug 18, 2011 7:07 pm 
Not sure how the "technique or flaw" was achieved or if i care to pursue it. But i suppose there's a name for it...

Image 210mm, 10 sec. f/14, WB Auto

Beyond the red lights is the Columbia River, at 8 or 9 miles distant from the camera it's a thin flat ribbon, but could it be a water reflection?


Image 210mm, 5 sec. f/10, WB Auto

Image 210mm, 10 sec. f/25, WB Auto

Only one moon was visible TTL and with the naked eye, but now i'm not exactly sure which one it was


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 Post subject:
PostPosted: Thu Aug 18, 2011 8:03 pm 
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Joined: Wed Nov 18, 2009 5:23 pm
Posts: 827
Location: Boca Raton, FL, USA
It's a ghost! No, really...that is what you would call a ghost image. It is typically something that happens when a very bright specular highlight image appears in a shot - sometimes the lens, sometimes a filter, sometimes the sensor box, sometimes a fixed mirror...many different things that are in the path show this mirror image ghost reflection of any bright blown out light areas.

A few ways to try to eliminate what may have caused it: 1. If you were using a filter, take it off, try again - is it still there? If no, it was the filter. 2. If you have another lens, put it on and try again - is it still there? If no, it was the lens. If after all of the above it's STILL there, then it could be an unfortunate side effect of your camera's sensor box which may be reflective somewhere. Most often though, this is a lens issue or filter issue.

One particular way to reduce the effect significantly is to not blow out the moon so badly - yours is hugely overexposed (the blown out one is the 'real' moon in your photo). It's difficult when you're trying for a shot where you have the landscape or foreground which also needs to be exposed, since you need completely different exposures for a nice moon (daylight) and the night landscape (nighttime). The moon essentially follows the same exposure rules as a sunny afternoon - low ISO, fast shutter, stopped down aperture.

You either have to accept a slightly blown out moon (and possible mirror reflection ghosts) to get your landscape exposed, or accept the landscape too dark to see anything and get a really nice moon...or take multiple shots and combine them with different exposures for the land and the moon.

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Sony A6000 / 18-55mm F3.5-5.6 / 55-210mm F4-6.3 / 10-18mm F4 / 35mm F1.8 / 16mm F2.8 / via manual adapter, lots of Pentax K mount, Konica K/AR mount, and Leica M mount manual lenses

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 Post subject:
PostPosted: Fri Aug 19, 2011 2:19 am 
Ghosting: thanks, kinda mysterious. Anyway, there was no filter on that lens. The moon was coming up large and bright orange, almost bright as a sunset. It didn't look good at lower ISO and higher shutter speeds so i just started fiddlin around, when the ghosts showed up.


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