My second (the first being a secondhand SMC P-M 50mm F1.4 manual lens, I’ll talk about it later) prime lens is a pentax “pancake” lens, the SMC P-DA 40mm F2.8 Limited.
Just like any other pancake lens, the size is very minuscule compared to the “standard” sized lenses. Here is the DA 40mm F2.8 standing side by side with my Tamron AF70-300mm F4-5.6 Di LD and Pentax SMC P-DA 18-55mm
It came packaged with a nifty pouch to store the lens when it’s not mounted on your camera.
Test shot on Revoltech Black Getter Robo, resized, and photoshopped to remove the stand, otherwise nothing was altered. Click to view larger size.
This one is a pic of my neighbour’s kid
Combined with K100D’s SR function, the DA 40mm Limited is suitable for indoor photos, although isn’t quite as good as the M 50mm F1.4. And for a Limited lens, the price is not that expensive.
All photos beside the test shot is taken with Canon Powershot A640.