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05-06-2010, 01:03 AM   #16
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It's about the largest possible aperture the lens can achieve.
f/1.4 is 'faster' than f/1.7, which is 'faster' than f/2.8.

Speed is one thing, but sharpness is another - although I don't have a DA 40, I haven't felt the 'need' to get one for the basic fact that my FA 50/1.4 is more than adequate to do the job. I'm also spoilt having the FA 31 and 77 ltd lenses at my disposal. In any case, the FA 50/1.4 is definitely worth its cost for its versatility and speed. Not everyone likes it for its less practical focal length on an APS-C (digital) SLR camera, but I've found it great as a portrait lens.

05-06-2010, 04:34 AM   #17
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Don't want to be harsh here, but one cannot get a full course on photography by asking on a forum what is this and that. I had the same questions in my time and I Googled it, I bought and read some books (for example Scott Kelby's Digital Photography and so on) and I applied what I have read taking pics. After that you will understand a lot more and figure yourself your next gear needs.
05-06-2010, 11:13 AM   #18

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QuoteOriginally posted by poogeek Quote
nice! btw what do you guys mean by fast and slow lens? is it the AF?
As Ash indicated, "faster" lens means "brighter" lens. In the old days when film was not very sensitive, an exposure may takes tens of minutes. A guy with a "brighter" lens could take more portrait photos and thus was "faster" in making money.

Back to the FA50 and the DA40, the DA40 F/2.8 is 2 stops slower than the FA50 F/1.4. But in terms of autofocusing speed, the DA40 is much faster (achieving focus in less time) than the FA50. In fact, the DA40 is probably the fastest in terms of autofocusing.
05-06-2010, 05:27 PM   #19
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not an indoor person, so the DA 40mm was perfect for me

loving every images i take with that lens.

12-20-2010, 09:09 PM   #20
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I am glad I saw these beautiful photographs. I personally believe the Pentax-M produced some of the best lenses ever, even better than the digital autofocus DA. For example the M 50mm f1.4 and the M28mm f2.8 are the ones I use the most. I am relatively new to digital photography and made the purpose of using manual focus and manual shooting most of the time. After a while, I have the feeling for what lens is best for what job. Long live the Pentax-M series.

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