USA deals roundup (GX1 + $200 off on selected lenses, Sigma for m43 $199)

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The new Sigma 30mm f/2.8 for Micro Four Thirds is now available for preorder at BHphoto (Click here). The price is $199. I don’t know how many of you will buy that lens :)

A much more interetsign offer is the $200 rebate on selected lenses when purchasing the GX1 body at BHphoto (Click here).

And don’t forget that Olympus launched a massive price drop on many cameras and lenses:

PEN rebates

$50 price drop on all Olympus E-P3 bodies and kits at Amazon (Click here), Adorama (Click here) and BHphoto (Click here).
$100 price drop on the Olympus E-P3 double lens kits at Adorama (Click here).
$50 price drop on all Olympus E-PL3 bodies and kits at Amazon (Click here), Adorama (Click here) and BHphoto (Click here).
$100 price drop on the Olympus E-PL3 double lens kits at Adorama (Click here).
$75 price drop on all Olympus E-PM1 bodies and kits at Amazon (Click here), Adorama (Click here) and BHphoto (Click here).
$125 price drop on the Olympus E-PM1 double lens kits at Adorama (Click here).
$50 price drop on all Olympus 9-18mm lens at Amazon (Click here), Adorama (Click here) and BHphoto (Click here).
$100 price drop on all Olympus 75-300mm lens at Amazon (Click here), Adorama (Click here) and BHphoto (Click here).

Four Thirds rebates

Olympus E-5 body $100 price drop at Amazon (Click here), Adorama (Click here) and BHphoto (Click here).
$50 price drop on all Olympus 14-54mm lens at Amazon (Click here), Adorama (Click here) and BHphoto (Click here).
$100 price drop on all Olympus 70-300mm lens at Amazon (Click here), Adorama (Click here) and BHphoto (Click here).
$30 price drop on all Olympus 35mm lens at Amazon (Click here), Adorama (Click here) and BHphoto (Click here).

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  • “$100 price drop on all Olympus 70-300mm lens at Amazon (Click here)”
    $800 for MFT
    $480 for FT ($300 for FT +$180 for new Oly MMF-3 adapter)
    (I don’t see whether $100 discount still applies or is already in price.)

    But! There’s a $320 (or $500 if you already have MFT/FT adapter) discount for buying FT glass. One good reason for FT glass: the MFT glass can cost double.

    Just sayin’. (Yeah, the 70-300mm FT glass is a steal, even if it’s not pro, weather-sealed glass.)

  • soldar

    note there’s also a 150$ and 100$ rebate on different lenses, specifically 150$ on the 25mm 1.4 and 100$ on the 20mm 1.7, quite a nice deal.

    • Mr. Reeee

      Do you have a link? I checked the Panasonic web site and found nothing.
      I just ordered a 100-300mm, so saving an extra C-note wouldn’t be a bad thing!

      • sopi

        I dont see rebates for pana lenses, could you please give us the link to it? thanks

  • BDJ

    There’s also a $150 and $100 rebate for other Panasonic lenses with the GX1. Looks like you can get a rebate with any of the lenses. $100 rebate on the 20mm 1.7 might appeal to many.

  • Vivek

    I may buy the NEX version of the Sigma 30/2.8 for my NEX-7.

    It is a bit too much for the m4/3rds. LOL.

  • Bob B.

    That is a sweet deal at B&H! $200 off of three great lenses!!!!

  • Reza

    The Sigma 30mm 2.8 does in fact fill a hole in m4/3 land, and I don’t think it’s too large:
    http://www.ephotozine.com/article/sigma-19mm–30mm–180mm-lenses-at-ces-18269

    It’s also cheap and in a few months it will probably resale for about $150, that’s almost impulse buying territory. I might try it then. Assuming it has decent quality of course.

    • Fan

      I will buy it too, as soon as it is in stock somewhere.

      Thanks for the link! Finally somebody dares to say things like this:
      “… Sigma cleverly filling in any gaps in the currently lens lineup for Micro Four Thirds and Sony systems. The new lenses are not pancake lenses in order to maintain high quality, however they are still compact, particularly the 30mm lens which looks good on the Olympus PEN E-P3 shown above.”

  • BLI

    PDAF vs CDAF (again):
    From the previous thread, Esa and others tried to enlighten me on the different ways PDAF and CDAF work, and why the E-M5 will give slow autofocus for 43 lenses. I tried to sum up my discussion in that other thread, and take the liberty to repeat my summary below (new threads tends to kill discussion in the old threads…). Can you experts confirm (or invalidate) my summary?

    Ok. So you guys say that CDAF requires the lens motors to make *high frequency* movements back and forth, and in doing so (based on some contrast measure) the CDAF decides in which direction the motors should go “on the average”. While PDAF can assess the direction in which to go *without* making this rapid “experimental” movement. Is this it?

    Next, the 43 lenses are not prepared for these rapid movements (“perturbations”): they both have limitations in how fast they can move, and they might not take the ‘wear and tear”? While on the other hand, the *m43* lenses have very rapid servomotors (much faster than what is needed for the “slow” focusing); sufficiently fast for high frequency movements to “perturb” the contrast and build up the direction in which to go??

    • Fan

      Yes. Another point is that PDAF can not only predict the direction, but also the amount of movement necessary to get into focus. Thus, PDAF lens motors aren’t made for many small movements. They can only make quick, larger movements. But since CDAF uses small movements only, they have a big problem.

    • BLI

      Assuming that my summary explains how CDAF works and why 43 lenses get slow autofocus with a CDAF-based system, I have a simple solution :-):
      1. Extend the IBIS to 6 degrees of freedom, i.e add the possibility to move the sensor back and forth.
      2. Instead of perturbing the focus by means of the lens servo motors, shift the sensor back and forth in the sixth degree of freedom either using piezo electric actuators or electromagnets. This should give the same effect.
      3. The sensor can be perturbed extremely fast and with little energy usage, I would think — compare the high frequency for cleaning the sensor by shaking it.
      4. Possibly, a similar effect can be achieved by rotating the sensor along the pitch axis — this is somehat more complicated, though.

      *If* my understanding of the problem is correct, this method should solve the problem — provided that the stroke in a 6th axis is sufficient to detect a contrast difference…

      • BLI

        Ok — the Olympus sensor cleaning system doesn’t move the actual sensor, but uses a piezoelectric actuator to shake a protecting glass at 30-50 kHz or so (wiki…). Or something like that. Other systems move the sensor back and forth at ca 100Hz to shake off the dust. Such a system with sufficient stroke is almost sufficient to get PEN E-P3 quality CDAF measurements for any lens — it is not necessary to use the lens motors if one instead shifts the sensor.

      • dzv

        I had the same idea a couple of weeks ago, just before the E-M5 was announced (and I probably wasn’t the only one). It seemed like Oly’s new IBIS system could have offered a great opportunity to try to solve the PDAF lens issue. Unfortunately, it doesn’t seem like they’ve implemented it.

        I’m still slightly optimistic that it is a possible solution, even possibly through a firmware update. Even though the new IBIS only has 5-axis stabilization, it doesn’t mean they can’t actually move the sensor on the 6th axis (in/out). My understanding is that the new IBIS mechanism basically has the sensor ‘floating,’ held in place by several magnets. Assuming they have the ability to tilt the top of the sensor in/out, and also tilt the bottom of the sensor in/out (the pitch axis?), then they could conceivably move both the top and bottom of the sensor in/out simultaneously. The question then becomes whether the mechanism allows enough movement (stroke, as you called it) for the CDAF algorithms to work.

        ps. See my comment and occam’s reply here:

        http://www.43rumors.com/ft5-new-images-and-sensor-info-announcement-on-2am-london-time-follow-us-live/comment-page-1/#comment-107815

        • bli

          Even if they just do pitch, they actually move part of the sensor in both of the sixth directions simultaneously. But that stroke might be to small, and it is slightly more complicated to analyze the contrast measurements — perhaps.

  • FYI – the Pana 20mm is out of stock, for now.

    Was gonna finally use all my gift cards to B&H to buy one! Guess I’ll have to wait a couple of weeks…

  • Brian

    So who’s the first person conned into buying the Sigma? Come on, I know you’re reading this.

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