|Variations in H-a Solar exposures
The first journey with my newly delivered Coronado Solarmax90/T-Max and 30mm blocking filter, was those to explore its
capabilities as well as its limitations. it is used on an FS128 Takahashi with imaging initially via a Nikon CoolPix 995 digital camera
and more recently a Canon 10D digital SLR. One important aspect to determine during the maiden voyage was the effects of
variations in exposure times. The below sequence of images were taken through a direct-coupled 31mm T5 Nagler eyepiece with
exposures ranging from 1/30th to 1/1000th of a second (other settings were tried at subsequent dates).
1/30th 1/60th 1/125th
1/250th 1/500th 1/1000th
The next quandry was how an image would react to processing. These were my first attempts with the first images so be gentle
with me! The below examples are from the lone 1/30th exposure I had taken (see raw image above). The image on the left
accentuates details on the disk (at the expense of the prominences) while the image on the right was pushed to favor the
prominences. Future attempts used a better base image and multi-tiered processing to bring out the disk details as well as the
solar promenance wisps.
|Ironically, the bottom right image is the only one from this group that is correctly exposed for surface details (see next sections)!
|I eventually embarked on a quest to determine why I was not capturing as much detail in my images as was being displayed in the
eyepiece. To continue the journey, visit my "In Search of Solar Nirvana" pages: Imaging Blues and H-a Processing.
|I realize these images have a "hot" area. My game plan was to first determine
exposure effects, with etalon and blocking filter adjustment trials coming later.