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Grands froids au Québec / Quebec's cold weather (Lens comparison)
Lens: Irix 15mm ƒ/2.4 Blackstone (1/640s), SMC Pentax-FA 43mm F1.9 Limited (1/2500s) Camera: Pentax K-1 Photo Location: Saint-Philippe, QC, CANADA ISO: 100 Shutter Speed: 1/640s Aperture: F11 
Posted By: Weevil, 01-30-2019, 01:01 AM

This arctic winter scene has been captured with the Pentax K-1, using two different lenses at 2 minutes interval (Note: Both were at ƒ/11 and ISO 100, only the shutter speed is different).

One lens has a 43mm focal lenght, and can be considered as a "real-life size view", and the other is a 15mm wide-angle lens.
The photo taken with the 15mm has been heavily cropped to match approximatively the other photo (slight) cropping, but the final resolution is signicantly affected, e.g. the 43mm has seven times more pixels than the one taken with the wide-angle lens.
Also note the different "starburst" effect, that is dependent of the number and the roundness of aperture blades.


SMC Pentax-FA 43mm F1.9 Limited (1/2500s)


Irix 15mm ƒ/2.4 Blackstone (1/640s)


Grands froids au Québec / Quebec's cold weather (comparaison d'objectifs / Lens comparison)
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01-30-2019, 07:37 AM - 1 Like   #2
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Intesting comparison. For an ultrawide lens, the Irix has very little distortion, but the difference in how the two lenses handle the sunlight is quite different. The FA 43 is much "shinier, " which might be related to the greater resolution, but the difference in colour rendering suggests there is more to it.
01-31-2019, 12:16 PM - 1 Like   #3
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QuoteOriginally posted by Weevil Quote
This arctic winter scene has been captured with the Pentax K-1, using two different lenses at 2 minutes interval (Note: Both were at ƒ/11 and ISO 100, only the shutter speed is different).

One lens has a 43mm focal lenght, and can be considered as a "real-life size view", and the other is a 15mm wide-angle lens.
The photo taken with the 15mm has been heavily cropped to match approximatively the other photo (slight) cropping, but the final resolution is signicantly affected, e.g. the 43mm has seven times more pixels than the one taken with the wide-angle lens.
Also note the different "starburst" effect, that is dependent of the number and the roundness of aperture blades.

SMC Pentax-FA 43mm F1.9 Limited (1/2500s)

Irix 15mm ƒ/2.4 Blackstone (1/640s)
It is a nice view.

I like both renderings, but I like the Irix rendering better because of how it handles the sun.
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