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Forum: Pentax SLR Lens Discussion
11-04-2017, 08:27 AM
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There's a quick-and-dirty test to see if the hood you've picked is too narrower or too wide:
1. Set the lens with hood to: infinity focus, the widest zoom, & widest aperture
2. Hold the camera backwards at arms length with the viewfinder pointing up at the sky (notice that you can see the lit focus screen in the center of the lens).
3. If you carefully rotate the camera diagonally, you can actually find the edge and then corner of the focus screen as seen through the lens.
4. If the hood blocks your view of the corner, there will be vignetting and if you get the corner and the edge of the hood is far away, then the hood is too wide.
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