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08-16-2019, 10:24 AM - 2 Likes   #1
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Test shots from a 645D & SMC 67 500mm f/5.6 with 100% crops

Hi All,

I've had chance to do some testing with a SMC 67 500mm f/5.6 using the Pentax adapter on my D. My first impressions are good with lots of detail and very little CA. These were fairly quick shots using a Uni-Loc 1600 Major tripod, Uni-Loc 30BH ball head and I used the 2 second self timer (which also locks the mirror up). The files were extracted from the camera as a raw DNG, exported to TIFF without any manipulation and then converted to JPEG for uploading.

Subject distances are well over a km away, considering these were the first shots I'm very pleased with them. Rigging it is slow & cumbersome (as expected), but once on the tripod, actually using it is fairly fluid. The shots were taken from two different locations (moving the rig between the two was a bit awkward).

The photos:
Salford Tower blocks from 1.8km (wind farm approx. 25km):


Hotel Football (Old Trafford) from 1.3km:


Edit: Updated the distance to the wind farm to 25km (15.5 miles).

John.


Last edited by johnha; 08-30-2019 at 06:16 AM.
08-16-2019, 12:10 PM   #2
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That's not bad for this old 4 element design lens that pre-dated low dispersion glass.
08-16-2019, 12:37 PM   #3
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QuoteOriginally posted by desertscape Quote
That's not bad for this old 4 element design lens that pre-dated low dispersion glass.

I have to agree. That's pretty darn impressive. Your presentation of the big picture and the full crops are great. Really tells the story the lens clearly.
08-16-2019, 02:41 PM   #4
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The 5 element 400 Takumar is also quite good with low CA and very sharp. The 600 Takumar has serious CA from f/4 to f/8 but is a very useful lens from f/13 to f/45.

09-13-2019, 03:58 AM   #5
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Original Poster
Since posting this thread, I was curious about the wind turbines in the background as these are ideal tests for CA (fine structure illuminated against the sky in bright sun). I've re-measured the distance using Google Maps (and located the correct windfarm this time!), this puts them approx. 15.5 miles (25km) away. I've updated the first image to show a wind turbine at 100% and added an abstract of a building much closer which shows very little distortion.

Salford Tower blocks number 2:


The 'Lightbox' development, Salford Quays (one of several similar buildings):
09-13-2019, 02:01 PM   #6
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The CA is not all that bad considering that this lens only has a triplet up front and a field flattener at the rear. This lens competes well with the 400 Takumar. Strangely, the 600 Takumar's CA problem is actually improved a bit with the use of a rear converter, probably because the converter is so well corrected for color.
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