Originally posted by Naj90 Hello dear photographers. I'm new to photography and bought myself a secondhand K10D to practice with.
I was advised in a previous thread to buy a Pentax autofocus 50mm lens. I found one in good state (so it says) for 75 euro/dollar. Would this be a good investment or should I find it for cheaper you'd say? I use a local website from the Netherlands and don't want to use eBay.
The DA18-55 zoom you already have is nothing special at all, if not the MKII Version or the DA-L or WR. The early version with came with the K10D is really outdated.
But you can use it to find out with focal length is better suited to your needs.
18mm is good for landscape and if you need wider, then a good sample of a
DA 16-45/f4,0 ED is worth considering.
It is far superior to any kitlens but you must check that it doesn't wobble too much.
It does wobble anyway due to its construction but pictures should be evenly sharp throughout the periphery, if one side is less sharp then send it back!
A focal length of 35mm is as others said the equivalent of 50mm on fullframe or a analog filmcamera, the DA35/2,4 is a very good and cheap lens.
But the DA50/1,8 is faster, i.e. you can take photos in lowlight situations the DA35 with a few stops less (2,4) can't.
And as Christian said, the F50/1,7 is quite a bit better except maybe bokeh, because the DA50/1,8 has 7 rounded blades, the F50/1,7 has 6 blades and not rounded! I personally would not care much about this difference.
Of course you won't have the benefit of a fast lens with the DA16-45/4 but it is f4 throughout and it can 1:4 macro at 45mm
But it is sharp wide open (at least my sample which is one of the few zooms I use)
From 20-40mm it is almost as good as the DA20-40/2,8 ltd which of course is much better manufactured.
I had a long conversation with one of the best engineers repairing Pentax-lenses in the USA. He knew the FA31ltd inside out, as well as the legendary K28/2 (a Zeiss-design). He told me that the DA16-45 is a floated design like the others, something quite difficult to achieve with a Zoom
and that this lens was a real masterpiece. Then I got 2 samples of it, one was NOS (new old stock) and I love it. I kept one sample, the other is used by one of my sons.
The only lens which I feel is as good but with a wider range and faster is the Sigma 17-70/2,8-4 DC Macro HSM Contemporary, a very good lens but expensive (and more weight)
Buying from dealers over Amazon or ebay is not really risky because you can send it back (by law) within 14 days.
But you have to pay the shippingcosts, this has changed within the EU.