9.12.2015

as always, just one little kit problem

While taking photos of my staircase project I could see the SMC 24mm contrast was poor.  It turned out to be a small corner of the image was showing a piece of the cloudy-bright sky, and that was enough to produce veiling flare across the image.  I re-shot with my arm covering the bright area, only to find I had too much image shake for the SR to overcome.  I learned later that I had SR set for a 180mm lens, so it was working for a telephoto lens not a wide angle.  Oopz.

All of this points to the down side of classic glass.  SR does not set itself for them, the 40-year-old SMC coating isn't the best option for modern digital sensors, and relative to other options it's easy to make silly mistakes!

On the one hand a DA21 would cure the problem nicely - but it does leave a larger gap between 21 and 50mm (return of the DA35/2.4?).  On the other hand the Sigma 18-50 covers the range with modern optics and coatings and is silent to focus unlike the DA21 (and DFA 50 for that matter).  A bit more bulk for sure, but at 21mm it just straddles the f/2.8-3.2 maximim so the DA21 is no faster.  And the zoom is already in hand - so no further expense.  The age-old conundrum of carrying a few great primes vs. a convenient zoom reappears, especially when one of the few primes is not quite "great"!  Must check the 100/2.8 for veiling flare in similar circumstances now . .


DA15, K24, DFA50, M100, DAL55-300 on K-s1; Sigma 18-50 above.

While updating the group photo I noticed another new thing: not only does the K-s1 not come in the Pentax 'stormtrooper/panda' White and Black trim (it has grey trim), its white is not in fact white!  I know this because I put my broken white DAL 18-55 next to the camera and it's clearly not a good match - the lens is more intensely white than the body.  That saves me some effort, as I have a black DAL with a good mount which I could use to repair the white lens' cracked mount.  Now that I know the colors would look really wrong it saves me the effort.  To spare the fashion-conscious I left the hideous, clashing lens out of the photo.


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