September 15, 2010


On this day in 1928, Alexander Fleming discovered the antibiotic penicillin in the mold Penicillium Notatum.

Trim Castle - Light Study

This morning saw me in the beautiful and historic town of Trim, Co. Meath. It was a cold and blustery start to the day, cloudy for the most part, rain too but the sun did break through on occasion. It wasn't a day for making memorable images, the light was poor but I decided to use it as a way of showing the difference a few seconds can make when you are squaring up to take a shot like this. In this case, the subject is the majestic Trim Castle. Taken a few minutes apart, obviously, the shot on the left was taken in sunlight and on the right, the sky is dull and overcast. I would love to go into a detailed analysis of the light scenario in each case but my time is limited right now, however they illustrate effectively how quickly daylight can change and why sometimes it's worth hanging about to see how changing lighting conditions can effect your subject.

Photos: Images straight from camera, brought through ACR (Adobe Camera RAW) using default settings. Simply cropped in PS. Hand-held, I used a 70-200mm lens @ 90mm.
For both shots, camera set on Aperture Priority f/3.5 and ISO 400. In the case of the Sunny image, shutter speed was 1/2000 and the Cloudy image 1/400. A good example of how increased light enables faster shutter speeds.