I love this small Pentax Lens. Great for everyday shooting when you do not need to carry a heavy Zoom.
Barbara G. Hobbs, Amazon
12 October 2014
Summary: I use this Lens on my Pentax K5 IIs, I use it as my prime lens for most of the time. It is small flat and light weight. Makes carrying around a DSLR almost like a Point and Shoot Camera. Pentax Lens are for the most part over priced, but this lens is a good buy. The other 40 MM version of the Pentax lens is about double in price, this is good glass and it is a great lens for street photograph, as it is small so people do not pay much attention to you as when you are...
Summary: Super compact, super crisp. I LOVE this lens. It is so portable that I can fit this in my holster bag with the 18-55 on the camera, and almost makes the K-5 look like a point-and-shoot. The 2.8 is crisper than expected and provides a beautiful depth of field when wide open. At 3.5 and above it is sharp as a tack. Compared to its big brother this lens packs quite a punch for the price tag.
Summary: I haven't tested it extensively yet, but with the few test photos I shot, I noticed a marked difference in the sharpness/photo quality of the pictures taken with this lens vs my kit 18-55 and 50-200mm lenses. I winced to spend the money but after reading reviews I thought it might be worth it. It's worth it.
Summary: I have a lot of good to say about this lens, so let me start by telling you whats bad to just get it out of the way. 1- Purple fringing can be strong but only in significantly high contrast situations (tree branches in the gray sky, white fence/ or white floweres with sun hitting it, etc). Also occurs worst wide open at f2.8 stops to 4 stops then is gone.
Value for money 40mm optics, but mounting is tricky
Muzammil "IncidentFlux", Amazon
16 March 2013
Summary: It's a Pentax 40mm f/2.8 lens. Image quality is as expected of a prime lens. Looks really good if handled correctly. Mounting it to the K-30 is a real pain and tricky. I have an 18-55 WR and 18-135 WR lenses, both are quality lenses and mount easily in the first attempt. Value for money optics. Still a good lens.
Summary: Very small and light, goes very well on my Pentax k-5. Focus speed is fantastic, and makes a very small and portable camera setup. The only problem are the rubber lens cap and it does not come with lens shade.