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06-04-2012, 04:37 PM   #1
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How to stop down for a sun shoot

We have a transit of Venus across the sun that will not happen again before 2117. I have a K-7 and a neutral filter. How do I step down the aperture so as to get good photos of same? thanks to all for any input. I am in So.Cal and want to get this shoot on the 'morrow.

06-04-2012, 04:47 PM   #2
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To stop down, turn the rear e-dial in P or Av mode (or M mode if you want to go all manual). You will then see what the aperture is set to in the viewfinder (bigger numbers mean stopped down more).

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06-04-2012, 05:02 PM   #3
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I'm assuming that you have a tripod. If you haven't, I wouldn't bother. No, you won't be seeing another transit of Venus in your lifetime but at least you'll be seeing!

Engage interval shooting (assuming it's available on the K-7). Attach your ND filter and switch to manual mode. Project the output of the viewfinder onto a piece of white card to position the camera. Directly using the viewfinder or live view probably isn't a good idea, ND filter or not. Leave ISO at 100. Press the green button to take a metered reading. Adjust aperture using the rear dial and shutter speed using the front one, checking that the exposure indicator on the top LCD stays in the middle. Fire away.

Unless you've got that GPS widget that moves the sensor to accommodate the Earth's rotation, you'll need to adjust your camera's position periodically.
06-04-2012, 06:10 PM   #4
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ND filters aren't safe for solar viewing!

06-04-2012, 06:28 PM   #5
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QuoteOriginally posted by calsan Quote
ND filters aren't safe for solar viewing!
+1

ND transmit UV and IR quite well. You should be using a proper reflective solar filter.
Orion Safety Film Solar Filters
06-04-2012, 07:42 PM   #6
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Or a sheet of #14 welders glass. In my case I couldn't find it, so am using 2 sheets of #10, and I will NOT be using the viewfinder.
06-05-2012, 06:46 AM   #7
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Thanks to all....
06-05-2012, 07:21 PM   #8
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Kind of late into this thread, but developed B&W film (Silver based, not C-41) works quite well. This is the traversal using a piece of Fujifilm Neopan 400 taped to an ND filter:


1/125s, ISO 100, f/11
K20D, Tamron 70~300mm 1:4.5~5.6, Vivitar 2X teleconverter

06-06-2012, 06:29 AM   #9
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Very good shot. Thank you for sharing. Will look at mine on the 'morrow.
I have similar outfit but w/ a K-7 w/o the Vivitar teleconverter. 300+ shots.
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