Reviews and Problems with Pentax SMC FA 645 400mm f/5.6 ED [IF] AF
Showing 1-6 of 6
16 April 2013
Excerpt: As a 400mm lens, this is small and hand hold able. It is about the same size as DA*300/4. Image quality is excellent, but DA*300/4 is still a little bit sharper at f/5.6 and if you crop the image from DA*300/4 to the same size as from FA*400, it is difficult to see any difference. But if FA*400 is stopped down it will resolve more detail than the 300mm lens. Autofocus is fast, but I never could get it to work properly on any K-5 I tried it on.
Excerpt: The lens is quite light and very sharp when used at high shutter speeds or very secure tripod mount at lower speeds. It doesn't have the build quality of * lens, but the optical quality is in the same league. I find the AF reasonably fast (but I was using manual focus lenses before the 645D so my perspective may be different) more importantly,I find the AF very accurate.
Excerpt: This lens is very sharp and relatively light weight for its length. It is about as long of a lens for the 645D as I'd typically travel with (the length starts chewing up limited storage space in a backpack). With that in mind, I think a nice telephoto travel set with the 400/5.6 is the 75/2.8, the 120 FA macro and the 200 FA. (If weight/size needs to be kept to a minimum, then I'd go with the 75/2.8, the 150 FA and 300/5.6.
Excerpt: I recently bought this lens second hand to use with an adapter on my Pentax K-5 and I must say it does not disappoint. It is lightweight and can be handheld though it can be hit and miss even with the anti-shake as it equals 600mm on a fullframe equivalent.
Excerpt: This lens looks enormous when complete with its large lenshood but is surprisingly light for its size. It is very sharp at f5.6 and remains so until at least f16. However extreme care is required to get sharp images due to shake/vibration etc even when mounted on a good strong tripod. You really have to hone your long-lens technique to get this one to work for you. But when you get things right the results are extremely pleasing.