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12-08-2012, 04:44 AM   #1
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Do I need DA*55?

Already have the 16 50. How many stops of iso do i gain using av mode between 2.8 and 1.4?

12-08-2012, 04:46 AM   #2
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Two stops (F2.8 -> F2.0 -> F1.4).

It's sharper too.
12-08-2012, 04:49 AM   #3
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So iso with 2.8 at 3200 will be lowered to around 800 in av mode under same lighting?
12-08-2012, 04:56 AM - 1 Like   #4
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If your shooting at F1.4, you can go down to ISO 800 vs 3200 @ F2.8..

But you'll have quite a thin DOF, so you to be aware of that as well.

12-08-2012, 04:59 AM   #5
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QuoteOriginally posted by JinDesu Quote
But you'll have quite a thin DOF, so you to be aware of that as well.
and that's the trickiest part !
12-08-2012, 05:00 AM   #6
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Yes I rather take a chance on dof than noise. Beside the subject is quite far out. Patiently waiting for Xmas deal. ....
12-08-2012, 05:33 AM   #7
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QuoteOriginally posted by JinDesu Quote
Two stops (F2.8 -> F2.0 -> F1.4). It's sharper too
Better yet the the DFA 50 macro; it's the best of the 50's with the additional macro option added in. Plus at the other end of the aperature scale it goes down to f32
12-08-2012, 05:41 AM   #8
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Something to ponder about. But I am thinking of reverse mount manual lens and extension tube.

12-08-2012, 06:51 AM   #9
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QuoteOriginally posted by lightbulb Quote
Yes I rather take a chance on dof than noise. Beside the subject is quite far out. Patiently waiting for Xmas deal. ....
then, my only advice is buy it somewhere you can return it, if you're not happy.

I bought mine second hand, and it back focus really hard and need service, but here in europe it cost arm and leg such things.
12-08-2012, 07:22 AM   #10
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QuoteOriginally posted by lightbulb Quote
Yes I rather take a chance on dof than noise. Beside the subject is quite far out. Patiently waiting for Xmas deal. ....
Here, let me help you out with that!
https://www.pentaxforums.com/forums/pentax-price-watch/207498-da-55mm-f1-4-595-a.html
Happy Holidays!
12-08-2012, 07:29 AM   #11
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Well, I see about two stops improvement. Usually shoot DA 55 at f2 and the 16-50 at f4. The bokeh is nicer on the 55 and edges are a lot sharper. f1.4 is usable, but definitely softer than stopped down to f2.
12-08-2012, 07:34 AM   #12
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I have both lenses and well, to me they are totally different purposed lenses. The 16-50 is a general purpose lens and the 55 is a really great portrait lens. It can be good for some other things (I've seen it used for landscapes too) but it's just not a versatile IMHO. To me, if you were comparing lenses, the 55 should be compared against say the DA70 or FA77.
12-08-2012, 07:37 AM   #13
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The da 55 will be way sharper at f4 vs the 16 - 50. do you need it? only you can answer that. Need vs Want always has a very thin line between them. I'm pretty sure you want to get the DA55 because you're somehow interested in getting it. Good luck (; And also there's a DA50 1.8 that is way cheaper than the 55 that you might want to consider. Anyway having a capable camera that can handle high ISO is also important, I know that your camera the k5 can handle high ISO at 3200 or 6400 . Imagine having a k7 where I can only push it to 800 - 1000...
12-08-2012, 07:52 AM   #14
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QuoteOriginally posted by NeverSatisfied Quote

But the 50-135 isn't on sale.
12-08-2012, 07:58 AM   #15
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QuoteOriginally posted by kaiserz Quote
The da 55 will be way sharper at f4 vs the 16 - 50. do you need it? only you can answer that. Need vs Want always has a very thin line between them. I'm pretty sure you want to get the DA55 because you're somehow interested in getting it. Good luck (; And also there's a DA50 1.8 that is way cheaper than the 55 that you might want to consider. Anyway having a capable camera that can handle high ISO is also important, I know that your camera the k5 can handle high ISO at 3200 or 6400 . Imagine having a k7 where I can only push it to 800 - 1000...

I don't see much special on k5. But on k5iis the 16 50 shines, from af to sharpness. That makes me wanted to own the 55 and 50-135. I just love wr fast lenses. The 55 will be used for product shots and working the field.

Tried the 50 1.8, doesn't really impress me.
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