I am a Pentax K20D owner, and now I'd like to buy my first macro lens.
Candidates I consider are:
- Pentax-D FA 100 mm F2.8 Macro 365 g, 560 €.
- Pentax-D FA 100 mm F2.8 Macro WR weather-resistant, 340 g, 590 €, nice bokeh.
- Sigma 70 mm F2.8 EX DG AF Macro 525 g, 460 €, nice bokeh.
- Sigma 105 mm F.28 EX DG AF Macro 457 g, 400 €, nice bokeh.
- Tamron SP AF 90 mm F2.8 Di Macro 405 g, 400 €, nice bokeh.
50 mm lenses I considered initially:
My questions are/were:
- (not important now, as I decided to go for 100 mm) How does Sigma 50 mm compare against Pentax 50 mm?
- (answered) What's the difference between 100 mm and 100 mm WR (beyond weather-resistant sealing)? (UPDATE: I also found a comparison)
- (answered) Which other lenses should I consider? (UPDATE: thanks for pointing me to other Sigmas and a Tamron)
- Is there anything I should be aware of with Tamron 90 mm?
I am going to use it as a secondary lens during my outdoor activities (mountaineering, backpacking), either as complementary to the kit lens or to the midrange fix (I am about to buy the new 35 mm f/2.4 too). So, the weight and durability matter. WR is a big plus for me. But I am not sure about the focal length. On one hand, it is very likely I'll shoot without a tripod sometimes, so a shorter f might be more convenient. On the other hand I lack moderate telephoto (I own an old FF 135 mm manual lens, but as a beginner photographer, I don't have anything in between the kit and that lens yet). Being able to use the same lens as macro and telephoto is an attractive option.
Please share your suggestions.
UPDATE: I decided to get a focal length around ≈ 100 mm, and finally chose Tamron 90 mm F2.8, it is told to be even sharper than Pentax 100 mm WR, is not much heavier, and much cheaper. And after few months of use I am very happy with its ergonimics, build and image quality. It also makes a nice portrait lens for outdoors. It doesn't have a QuickShift focus system, so I have to be careful to always switch the camera in MF mode before rotating the focus ring, and without WR I have to pay more attention under the rain (I just put an umbrella above it, and after the session I let the accidental water drops dry up by leaving the lens in extended state); but 200€ of price difference outweight these inconveniences for me.