Ottawa Centre Monthly Observing Challenges Beginning in 2007,
Ottawa Centre introduced a new item to its monthly meetings: an
observing challenge object. Each month the centre will post a
description of an interesting object. Members are invited to
observe, sketch, photograph, or otherwise learn about this
object. At the subsequent monthly meeting, an agenda item will
provide an opportunity to share your thoughts, photos, sketches,
or comments. Lunar: Observing with Negatives By Brian McCullough
February's Lunar challenge is for a technique, not a specific
target. Brian discussed how taking photographic negatives of
lunar images often reveals detail not visible in the normal
positive shots, because our eye is optimized to detect certain
types of contrast. The challenge is for lunar images to use
their image-editing software to produce photo-negative versions
of some of their images, and to bring examples of images where
the use of positive and negative images reveals interesting
different details. |Most image