Summary: I have pictures and such in my blog article on this lens: http://photographybanzai.com/2010/11/24/lens-review-pentax-da-300mm-f4-sdm/
Pros: What I like about the lens:, - While I have not scientifically tested the lens, I feel that it is sharp enough from it’s widest aperture and have never found an image that was was not good enough due to optical quality., - It follows the tradition of Pentax rendering with vivid contrast. This lens is also very strong at controlling chromatic aberrations such as purple fringing., - Seems very good at controlling flare, but I almost always use the lens hood., - The boke...
Cons: What I’m not too fond of:, - Maximum aperture of f4 is challenging at times with my K-7 because I like to keep the ISO low, but I’m not sure how much having f2.8 would really help…, - The lens isn’t cheap hovering around $1100, but good lenses hold value well., - Pentax SDM hasn’t had the best track record, but my lens has been problem free. I did have two instances when I first got the lens where I needed to slightly rotate the screwdrive screw on the camera body aft...
Pentax 300mm f/4 ED IF SDM SMC DA* review by sjwaldron
24 November 2010
Summary: What I like about the lens: - While I have not scientifically tested the lens, I feel that it is sharp enough from itâ€™s widest aperture and have never found an image that was was not good enough due to optical quality. - It follows the tradition of Pentax rendering with vivid contrast. This lens is also very strong at controlling chromatic aberrations such as purple fringing. - Seems very good at controlling flare, but I almost always use the lens hood.
Pros: Sharp low chromatic aberration lens with quality build and WR.
Pentax 300mm f/4 ED IF SDM SMC DA* review by buckeyemikie
6 September 2009
Summary: I've used this lens for about two months now and like it better every day. I've used it on my Bushhawk shoulder mount, Bogen and Flashpoint (carbon fiber) tripods with excellent results. Watch your shutters speeds if using a shoulder mount as its easy to end up at too low a speed even with IS tunrded on. I've used it to shoot tulips using selective focus to highlight a single tulip in sharp focus with beautiful results.
Pros: Beautiful bokeh; easy to hand hold w/K10 & 20; very sharp
Summary: Seems to be extremely sharp at all apertures except wide open (f/4). This is a big improvement over the non-ED(IF) lens. Blistering sharpness all the way down to minimum aperture. Integral tripod mounting collar on barrel balances a 67II body at precisely the right "sweet spot".
Pros: Extremely sharp optics, Tripod mounting collar built-in, Polarizer operating window in hood, excellent balance due to IF, can be hand held with fast film and high shutter speeds
Cons: Heavy...not for the faint of heart, Expensive (but worth it)
Summary: Très content de mon achat. Mise au point silencieuse, image très nette et très lumineuse. Je photographie beaucoup les oiseaux et cet objectif me donne entière satisfaction. La livraison, aucun problème comme d'habitude avec Amazon.