I actually applied what I learned; amazing
Mar 13, 2017 11:29:52 #
I often take snapshots of projects I work on so I can show a customer how the work is coming. The most pressing project right now is painting all the fiberglass parts on an experimental aircraft. While reducing the surface I found two spider cracks in the gel coat of the upper engine cowling. I took the first picture on full auto, although I think I had the ISO set on 200, with ambient light provided by an LED bulb and a four foot fluorescent with vanity bulbs (pinkish light). The results showed the crack but color rendition was just horrible. I played with it a bit with Irfanviews color correction subroutine (cntrl G) but there's still too much yellow in it. Clearly, the problem had to be fixed at its source. Sent off picture and had a nice conversation with owner about which way to go now.
The next day I decided to use a small, rat tail file with a curved end to remove the gel coat over the crack to see if it extends into the composite structure. Sadly, it does. Grabbed my Pentax K50 and set about getting a picture.
With a big gulp I spun the wheel of fortune to "M". I wanted more ISO but only enough to get the shot and not ruin it with pixelation later on. I went one more notch to 400. Next, I went looking through the menus for setting filters and found four different types for fluorescent light and selected cool light. Now I set the White Balance to fluorescent and twisted the lens to 55mm. I adjusted the aperture to wide open; the total depth of field would only be 60 thousandths of an inch or so, and moved the shutter speed until the needle was centered and took the first shot. A bit dark, I decreased shutter speed to 1/160. Better, but still a bit darker than I'd like. One more notch of shutter to 1/125 and I had the Goldilocks shot I wanted.
Clearly, some of "Understanding Exposure" has lit up a few neurons, I can do this.
Rick Girard
PS By going two stops overexposed did I do an ETTL, too? ;-}
PPS Oh, yeah, everything was shot hand held, almost forgot that tidbit
The next day I decided to use a small, rat tail file with a curved end to remove the gel coat over the crack to see if it extends into the composite structure. Sadly, it does. Grabbed my Pentax K50 and set about getting a picture.
With a big gulp I spun the wheel of fortune to "M". I wanted more ISO but only enough to get the shot and not ruin it with pixelation later on. I went one more notch to 400. Next, I went looking through the menus for setting filters and found four different types for fluorescent light and selected cool light. Now I set the White Balance to fluorescent and twisted the lens to 55mm. I adjusted the aperture to wide open; the total depth of field would only be 60 thousandths of an inch or so, and moved the shutter speed until the needle was centered and took the first shot. A bit dark, I decreased shutter speed to 1/160. Better, but still a bit darker than I'd like. One more notch of shutter to 1/125 and I had the Goldilocks shot I wanted.
Clearly, some of "Understanding Exposure" has lit up a few neurons, I can do this.
Rick Girard
PS By going two stops overexposed did I do an ETTL, too? ;-}
PPS Oh, yeah, everything was shot hand held, almost forgot that tidbit
Mar 13, 2017 11:35:28 #
Good for you. The two stops over exposure is ETTR.
--Bob
--Bob
lsaguy wrote:
I often take snapshots of projects I work on so I ... (show quote)
Mar 13, 2017 12:02:39 #
Mar 14, 2017 23:09:01 #
Nothing a little Epoxy can't fix :) :)
Shoot JPG + RAW and adjust the WB using the RAW in post
Shoot JPG + RAW and adjust the WB using the RAW in post
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