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11-12-2007, 08:40 PM   #1
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Quote Confused Me

I was thinking of buying the pentax 50mm 1.4 lens for portrait and stuff I like the price
and all. I am kinda new to dslr but I have learned a lot. I just got SO confused here a
quote of the review on this lens (bhphoto) "this lens offers a great deal of
options keep the aperture at 1.4 for great soft pictures
with lots of motion, or open it up for sharp pictures in low
light. Having the K10D IS is also a lot of help."

Now I thought that if you open it up as he says is the opposite of 1.4
you get better light? But if 1.4 is for most light and blur huh ok
whatever I don't even know how to ask if you see a contradiction in
the above quote then You will know what I am talking about otherwise I'm
Just mixed up... again.

11-13-2007, 09:14 AM   #2
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The greater the aperture (i.e. wider open the lens is), the greater the amount of light entering and ... generally... the softer the image becomes (as well as the lessening of the depth of field). Generally speaking, one should stop down at least one stop from maximum to get better results. The 50mm f1.4 lens, gives you a bright image and a super fast lens, but if you want tack sharp images, then stop down one or two stops.
11-13-2007, 09:19 AM   #3
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when you say down you mean up?
Like not 1.4 but 2.0
11-13-2007, 09:36 AM   #4
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LOL... yes. To stop "down" means that the aperture numbers are going "up" or becoming greater... from 1.4 to 2.0 to 4.0 and so forth. Going "up" in number actually is what is called stopping down. The opening or aperture, is becoming smaller as the you stop down.

11-13-2007, 10:20 AM   #5
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It's a badly worded sentence. It sounds like the "or" is opposing f/1.4 vs. opening up the aperture -- you can do one or the other. But what (I think) it means to say is: you can open up the aperture to f/1.4 to get pictures with a shallow depth of field which can be used to give a feeling of motion and can also provide enough light to get sharp focus in low light". Or something like that.
11-13-2007, 10:59 AM   #6
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QuoteOriginally posted by NYpHoToGraphEr Quote
when you say down you mean up?
Like not 1.4 but 2.0
It helps to realize that fstops are a fraction. IE. 1/2.0 or 1/1.4. Obviously 1/2.0 is smaller than 1/1.4 wherefore comes the nomenclature "stop down" even tho the fstop numbers are going up. The way I finally "got it" was to say "one over" every time I saw an fstop number. That way I realized I was going down even tho I was moving from f2.0 to f4.0.

NaCl(up is down and lower numbers are faster)H2O
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