Prognathous: The price and specifications are very appealing, but if image quality is similar to a Bigma then I'm for one am not interested. The AF speed is also a concern because most Tamron tele lenses are not very fast. At least on the Sony A99 it should be possible to work around this with the electronic focus limiter, too bad I don't own (or plan to own) this camera...
http://kakaku.com/item/K0000605175/ near 1,200 US now and maybe <1,000 US a month after.
Alastair Norcross: Given that the Canon lens can be bought for less than the Sigma, because of the widespread availability of the Canon as a kit lens sold with several DSLRs, there would seem to be no reason for Canon users to consider the Sigma. It looks like a fine lens, but certainly not better than the Canon in any way that will show up in real world shooting.
obviously better than Canon at around 80mm which is sold as a kit lens for about 700 US something.
though I don't know who designed 55 Zeiss, Cosina is probably the most experienced maker with MF primes. but then as a rare example shows us, the Canon 300/4LIS is not as good as Nikon AF-S-D in test but can more likely get better results in the field and that's only IS. AF should make far more difference.
Leiduowen: Joseph Petzval (1807 - 1891) a mathematician, inventor, and physicist best known for his work in optics. Born in the town of Spišská Belá in Slovakia (the then Zipser Bela in the Kingdom of Hungary). The Petzval lens was developed in 1840 and became an ideal lens for portrait photography. It is highly intriguing that this simple concept of two doublet lenses with an aperture stop in between would get revived some 170 years later. I can't stop laughing at the audacity of the project managers!
s/a Pentax. just buy some limited lenses, throw away the glass, and keep the barrel.
it's interesting that when Sigma announced 24-105/4, which basically targeted alpha mount (Canon and Nikon users got their genuine ones already, and at quite reasonable price for Canon as kit lens), immediately there came the rumor that Sony was going to release a similar lens in one year, which makes me laugh (s/a better dual-pixel AF than dual-pixel AF for A7's).
while some other makers are working on similar "small aperture" telephotos, there is no rumor or is there any?
SteveNunez: Considering the worldwide growth of m4/3, surprised they don't offer this len for that system- it would easily be the largest focal length available and would surely be popular with m4/3 shooters....ashame.
there is no advantage for 4/3" when we go telephoto, though they have now a slight advantage at pixel resolution (3.7 micron 16MPix 4/3" vs 3.9 micron 24MPix APS-C).
Mike99999: For all the trolls (yabokkie etc..): if you do the aperture equivalence, you also have to do the ISO equivalence.
To imitate an image captured by four thirds 17mm/1.4 ISO 6400 (clean on an E-M5), you'd have to set your full frame camera to 34mm/2.8 ISO 25600. Suddenly the comparison becomes less attractive when you do *full* equivalence...
4/3" can just use 18/0.7 to achieve every effect that 35/1.4 can have on full-frame, or 12-35/1.4 to compete with 24-70/2.8.
the beauty of aperture equivalence is that it includes every photographic effect with no exception. I would appreciate if we could have deeper DoF and higher light gathering capability at the same time but the God decided he won't let that happen.
JosephScha: Aperture: ... Lowest value 16Should that be "1.6" instead of "16"? If not, I'm confused. But then I'm confused by T1.6 instead of f/1.6
> but it concentrates this light on a much smaller surface, yielding better sensor performance.
> you have to adjust for equivalent ISO if not you are just spewing nonsense and/or trolling.
aperture equivalence is for every photographic effect that is controlled by an aperture, simple and straight forward.
nothing to do with ISO, which is no photographic concept.
for digital cameras, ISO is mainly used to suppress high readout noise at low light. new sensors (basically everyone except Canon) are called ISO-less that little difference in image quality can be observed setting a camera at base ISO.
Deutsch: Another one of her articles related to photos and what you actually recall, or assume:
a weapon can kill either a foe or a friend, it's not wrong tool but wrong doing.
yabokkie: hope we'll have 240p & 300p consumer video within a decade.
so maybe mick232 only wanted to confuse you or you are really willing to be confused.
yabokkie: photography, or any work or hobby are done in the old OODA loopobserve, orient, decide, act, and observe again
before one takes photograph he has to plan first (which is much more important than pressing shutter button), or orient and decide based on previous observation/experience, to prepare oneself for events happening. after the session, one will review and process the images when the events flashback for better memorization.
and people get more oriented, concentrated, and remember well with a task, even all the images are thrown away later (for a fake task). so better take photos even you don't want to keep any (but keep the memory).
there is one thing that I agree with the writer: one should not peeping into a small hole too much and get lost.
I highly recommend taking photos even when all the memory cards are full, like pretending to take a (group) portrait, talk with people, smile, press the shutter, fire the flash, and enjoy the moment.
you will remember it if you really enjoy it.
@ a13 & edu T,
I don't think mick232 is confused so no need to correct, though s/he might mean to confuse others who are stupid enough.
racketman: 16GB a second, that's a thirsty camera.
exactly, why huge processing power is needed and that huge processing power is nothing compared with future 3D perception based processing to which a large trunk of our brain is devoted.
it'll be amazing if RAW recording is possible but I doubt the value of it (little profit).
jerrymend: I bought the 190cx pro 3 (carbon) last month. Is this a newer version ?
an old version doesn't necessarily mean a worse version.
photography, or any work or hobby are done in the old OODA loopobserve, orient, decide, act, and observe again
it gets easier to compress the video as frame rate goes up, and if it's an issue of processing power or bandwidth, time will solve it fast and faster according to Moore's law and Gilder's law.
noncho: I was interested in this lens when it was announced more than a year ago, but now... It's too big(for M) and too expensive for a lens without AF(it's much higher than Samyang 14 2.8!). This one should be perfect optically to be considered.
just trim images taken with 14/2.8 if you need narrower field.
VertigonA380: I really love the specs of this unit, but it's about the size of a small DSLR.....what's that all about?
E-M1 is a "professional camera" for those who have no idea what what a professional camera is.
Markrl: It seems like many people that say they do not like the MFT format, the IQ, etc. must print HUGE images where the format may make a difference. I have seen images from those cameras that are spectacular in more normal print sizes.
nothing to do with printing which is no more than a display format among many, and an old and low quality one.
people blamed quality of lens adapters amazed by the result of stacked low quality elements.