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Fast 24mm prime lens

online poll by Opinion Stage

 

Rumors for a 24mm f/1.4 Art have been rampant for months. In my opinion, a modernized 24mm f/1.8 EX with Optical Stabilization (and HSM, needless to say) makes just as much sense.

Let me elaborate a bit further:

  • In this range, the competition makes f/2.8 lenses (both stabilized and non-stabilized, quite affordable), f/1.4 lenses (non-stabilized, usually very expensive), and a few unique optics with no stabilization (Zeiss 25mm f/2). A 24mm f/1.8 OS option would offer a good balance between speed, size and price ($799?), with OS to boot.
  • The super fast f/1.4 speed is probably less sought-after at 24mm than at longer focal lengths. Also, a 24mm f/1.8 is less difficult to design than a 24mm f/1.4 (see Q/A below). Field curvature and the various optical aberrations are a pain to correct with any f/1.4 lens, but the wider the focal length, the more difficult it is. So whether it is worth the effort or not is a tough decision.
  • As a bonus, the video market should respond favorably to a fast and stabilized wide-angle lens.

Continue reading ›››


Sigma's 19mm fixed-lens mirrorless camera

French magazine Focus Numérique has finished testing the Sigma dp1 Quattro in the lab. Here’s a summary of their report:

  • Even wide open, sharpness is exceptional within 1/3 of the frame.
  • Beyond, clarity declines. Stopping down improves things, but central areas are still sharper at f/2.8 than peripheral areas at f/5.6 or f/8.
  • Chromatic aberration is noticeable at f/2.8.
  • Unsurprisingly, 19.6-MP JPEG images converted from RAW files give the best results in terms of pixel quality. The camera can upsample images to 39 megapixels, but they look like out-of-camera Bayer JPEGs.
  • At ISO 800, colors start to shift and desaturate. With appropriate processing in SPP, good-looking black and white images with lots of details can be made even at ISO 3200.
  • Sensitivities above ISO 800 seem to be implemented in software rather than hardware.

Of course the last three points also pertain to the dp2Q and upcoming dp3Q.

[Source: Test Sigma DP1 Quattro at Focus Numérique]


Firmware ver. 1.01

An updated firmware (ver. 1.01) for the Pentax-mount Sigma 17-70mm f/2.8-4 DC HSM Contemporary is already available via Sigma Optimization Pro and the necessary USB Dock.

From Sigma:

It has corrected the phenomenon that the degree of image blur becomes bigger, when the image stabilizing system on the camera body is used.

You can see an example showing the issue here.

Follow-up to the Latest Polls

January 25, 2015 Posted in Polls 9 Comments

Sigma 85mm f/1.4 EX DG HSM

Reference: Which lens(es) would you like Sigma to update?

That was a much-discussed poll. A couple of notes:

  • The very good 85mm f/1.4 EX DG easily tops it. Now that the highly regarded 35mm and 50mm f/1.4 Art have set the pace for quality, a lens that rivals the Zeiss Otus 85mm f/1.4 – at a keener price – is expected.
  • It is interesting to note that the top ten features no less than six zoom lenses: three classics (17-50mm f/2.8 DC, 24-70mm f/2.8 DG, 70-200mm f/2.8 DG) and three lenses unique to Sigma (12-24mm f/4.5-5.6 DG, 50-150mm f/2.8 DC, 100-300mm f/4 DG). All of them are potential candidates to a Global Vision renewal. The 70-300mm f/4-5.6 DG, although not very popular here, is no less likely to be updated. APS-C users still show some interest in a good old 17-50mm f/2.8, notwithstanding the existence of 17-70mm f/2.8-4 and 18-35mm f/1.8 lenses.
  • The four fisheyes collected only 1.38 percent of the votes, with the majority going towards the 15mm f/2.8 DG. A very low score to say the least. I wonder why Sigma took care of offering so many fisheye options in the first place.

Enough talk, check out the detailed results:

Continue reading ›››


Sigma all-around zoom lens for APS-C cameras

Kudos to Sigma for reacting quickly.

We have found that the SIGMA 17-70mm F2.8-4 DC MACRO HSM | Contemporary PENTAX does not function properly when the image stabilizing system on the camera body is used.

For those who own the lens, we are going to provide the firmware update free of charge.
Please note that all lenses shipped from our factory from now on will have the latest firmware.

Continue reading ›››

Sigma Rumors' Price Guide Price/Stock Info as of 01/30/2015 14:05:54 GMT
Sigma Rumors' Price Guide
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