I’d like to think I’m not taking photos of your art, I’d like to think I’m making art with you, that I’m your partner, that I complement what you do....
October 28, 2014
February 18, 2016
PENTAX-DA645 28-45mm VS Pentax smc DA 645 25mm
November 19, 2014
I first got the Pentax smc DA 645 25mm f/4 AL (IF) SDM AW Lens and then learned about the HD PENTAX-DA645 28-45mm f/4.5 ED AW SR Lens , and kind of always thought that primes were better than zooms, but it seems in this case is not really like that, this test is not based on any scientific method, just comparing with my own eyes and letting you see what I saw just in case you are in the same dylema I was, makes sense to keep two $5K lenses that are so close in FL to each other? My conclussion at least for me, it is no, it is not worth. The differnce in FL is not that much, 3mm in medium format, which is probably about 2mm in 35 mm equivalent, plus the fact you can actually attach filters to the front of the zoom and you can not have to the front of the 25mm prime because its design. Add to that an awesome stabilizer on the 28-45 zoom, and that makes a no brainer to choose the Zoom over the Prime.
Here is a focal lenght comparison of the Zoom VS the Prime:
28-45 Zoom @ 28mm:
and an overlay of both:
and wide open you can see the zoom is much sharper than the prime and have pretty much no CA, here is a crop at 100% of the 25mm, observe the purple fringeon the tree and the blurriness o the letter of the sign
And here is a 100% crop of the 28-45mm:
No fringe, and much sharper wide open. This goes pretty much the same at any aperture I tested, the 28-45 is much shaper at the corners, and also in the center, and there is pretty much no fringe on the zoom while it is there very vissible on the 25mm lens