Tag Archives: Camera

Depth of Field Ain’t so Tuff

Figure 1: The DoF (Depth of Field/Focus) equation.

Depth of Field ain’t so tuff.

Recently I needed to take some photographs of the antique glassware that my spouse collects.  This is easy with a point n’ shoot, since its depth of field is pretty good thanks to the short focal length that most point ‘n shoots have in their built-in lenses.  The point ‘n shoots usually have a wide angle (anywhere from 6 to 15 mm – but sometimes variable up to higher focal lenghs with fixed zoom offsets).

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I Suppose this VOIDS the Warranty …

Figure 1:  My Pentax K5 probably isn’t under warranty now. 

So … I guess my K5 has long been out of warranty anyway.  About a year ago the mirror-box went out of calibration. Anyway – I think that’s what happened, and I thought about sending it in for a re-cal. Subsequently the LED/Live-View screen went belly up, and finally the main board.  The cost trade-offs seemed to imply that fixing the K5 was no longer an option, so I decided I may as well take it apart and see what makes it tick.  After a dozen or so tiny little screw removals …

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K5 Quandry

Figure 1:  Should I go mirrorless?

When I first used my K5, I was enthralled.  It was easily the most solid feeling camera I’ve ever owned.  Most cameras give me the feeling that I have glass in my hand (smile) – and that I have to be careful.  The K5 made me feel like I had a hatchet in my hand and that tossing it into a spiraling arc that ended on a cleaved tree trunk would do it absolutely no harm.

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Vintage Lens Honeymoon

Is Over.

Well, I kick-started my photography hobby for a second time recently after a hiatus of about 37 years. I bought into the theory that I could populate my lens arsenal with vintage stuff and save a bundle.  In short order I had over a dozen lenses in my possession, none made after the date they want to check on driver’s licenses in order to purchase hard whiskey.   Some were made not only that many years ago – but multiples of that many years.

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Doing Interval Photography with a Sigma SD14

Figure 1: Homemade “DIY” power adapter for Sigma SD14

I really have come to appreciate the Sigma SD14 camera that I’ve been using for over a month or so, applying it for IR photography.  It really shines there, due to the Foveon class sensor that outdistances most competitors in terms of IR sensitivity.  I have captured time-lapse photos that I believe contain as low as 1.5 microns (high mid-infrared) wavelength light.  This is ordinarily not possible with the standard Bayer sensor in most camera brands, based on the info (veracity unknown) – that I’ve come across in my internet meanderings.

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That Sinking Feeling (Camera Post Processing)

Figure 1: The only shot that was big screen viewable, without cringe.

I know what it’s like to be a balloon.   I had that deflated feeling once again this weekend, after a trip to the local lake.  The scene was spectacular, and was easily the most beautiful nature scene I’d personally witnessed to date.  In glee for my fortuitous presence at the scene next to the lake, at just the right moment, I snapped over two hundred photos.

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