Hi All,
I'm going to New York next summer and I'm thinking ahead regarding what kit I'm going to take. I want to travel as light as possible, which means leaving luxuries like the Sigma 100-300mm at home along with my Lee filters and big camera bag. It will be mainly street work and holiday portraits, so my camera bag will look like something like this:
Pentax K20D (obviously!).
Sigma 10-20mm (thinking wide angle Times Square long exposure at night, or Grand Central Station long exposure).
Pentax 17-70mm SDM f/4 (standard walkaround lens).
Hoya screw in polarizer.
Flash (if required).
In addition, I've been looking at a fast prime for portraits and low light for a while now. I currently have a 50mm f/1.7 that is looking a bit tired on the aperture blades, and it's not an autofocus lens. I've missed focus on a few shots, so it's maybe time to look at buying a fast portrait prime.
Given my desire to travel light in NYC, there is one obvious choice: the Pentax "pancake" SMC-DA 40mm f/2.8 limited. The MTF results on Photozone show that the resolution of this lens at f/2.8 is very, very good from centre to extreme. CA are also very minimal on this lens, so this pancake's image quality is simply sublime right from f/2.8 with virtually no distortion. It also ticks the box of being very compact and basically tiny; it won't add any overhead in my compact camera bag and will be very descrete for street shots. Build quality is also very highly praised being a metal chassis. However - is f/2.8 going to be fast enough for lower light conditions?
The only niggling feeling in the back of my head is the Sigma 50mm HSM f/1.4. Again, it receives excellent praise across all DSLR brands with very good MTF figures right from f/1.4. Additionally, it's an f/1.4 lens, so bokeh will be buttery and would also give me more headroom in low light conditions. The only real problem is that it is an absolutely huge lens and doesn't fit at all with travelling light. Build quality is probably not as good as the pancake either, and it doesn't exactly scream discreet. I also hear anecdotally that it is a heavy lens.
I'm not sure at all, both lenses are brilliant - the pancake is perfect in every way, but 'only' f/2.8. The Sigma is f/1.4, is superb from f/1.4, has awesome bokeh - but it's a real beast of a lens.
What do you think? Anyone tried both in the field? Any other suggestions? I'd like to get a discussion about this that will hopefully push me in one direction or the other.
Threads for reference:
http://www.photozone.de/canon-eos/392-sigma_50_14_canon?start=1 http://www.photozone.de/pentax/124-pentax-smc-da-40mm-f28-limited-review--test-report