Web Analytics RiceHigh's Pentax Blog: My Samples: FA645 120mm F4 Macro on 5D3

Tuesday, July 16, 2013

My Samples: FA645 120mm F4 Macro on 5D3

For what last time I mentioned about and intended to do, the following samples were taken and are now posted. Just browse the album below, full-size original samples are available per picture page:

http://smg.photobucket.com/user/RiceHigh/library/5Ds/FA645_120F4Macro?sort=9&page=1

(Or, you can view a quick Slideshow Here.)

All pictures were taken with direct JPEG out of the camera in best quality, hand-held, manual focused, aperture values were set in between f/5.6 to f/8, most at ISO 100.

Actually, I am satisfied with the Image Quality produced by the combo including the Colour Rendition. If you want to compare those pictures of mine against what you can get with the same model of lens on a 1.3X 645D (Mine is in 1.6X, when compared to the 6 x 4.5cm format), you can see the following earlier reviews by the others:

1. A User Review with Full Samples at the Japanese DC Watch. Some of the shooting subjects are quite similar to those of mine:

http://dc.watch.impress.co.jp/docs/review/labo/20110606_450161.html
(in Japanese, but viewing the pictures with foot notes are all self-explanatory.)

2. A Brick Wall Measurbation Test with the lens on 645D, at f/4 wide-opened, f/8, f/11 and f/32. The centre crops are posted:

http://dbphoto.net/blog/?p=124

Enjoy! :-)

Comments (8)

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Otto Ehrmann's avatar

Otto Ehrmann · 611 weeks ago

It is also possible to combine the Pentax 645 lenses with a tilt (10 mm) - shift (+/- 15 mm) adapter. The adapter is available for Canon EOS and Pentax K. Infinity is preserved. http://www.mirex-adapter.de/tilt_shift_adapter.ht...
7 replies · active 611 weeks ago
Interesting accessory. It works since the image circle of all those 645 lenses is larger.
its quite expensive adapter but gives a lot possibilities. maybe you could test it on your K5 rice?
kind regards
Adapting 645 lenses onto Pentax K mount DSLRs with a small cropped sensor is not a wise idea as the cropping is just too much, IMHO.
You just said that tilt shift on an aps-c is not wise. You need a larger image circle for tilt shift and imo the bigger the better because you will get less vignetting with maximum tilt+shift combinations. How this is not wise then?
Vignetting is not a problem for a 645 lens adapted on a 135 FF body, owing to the 1.6X crop factor already. But resolution drop is quite significant for an APS-C sensor than a 135 FF, for the same 645 lens, since the APS-C sensor is much smaller (only 44% in area if it is compared).
I know that the image circle of 645 lenses is a bit overkill for aps-c. But you should know that the physical size of the sensor doesn't affect resolution you'll gonna get from the lens but the actual pixel density matters. According to what you say 645 lens would be fine for FF dslr. Now take a look at the pixel density of D800 and K5.
This is not correct! Even the pixel density is the same per unit area, the resolution is not the same per picture height. It is therefore whilst the pixel pitch of the K-5 and D800 is exactly the same, the D800 actually has much higher resolution than the K-5. If your logic is correct, the Pentax Q will be the highest resolution machine owing to its very high pixel density, but indeed it is only in per unit area!

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