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11-27-2009, 07:32 AM   #1
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newbie need a portrait lens

Hello all,

after 2 weeks I enjoy playing with K-x + DA 40mm Limited, Kanon Temple Japan and Burning Momiji (Maple Trees)
my other lens is a MF lens, Pentax-A 50mm F1.7.

now I'm looking for a portrait / short tele lens with autofocus . Maybe a new DA 70mm or used/new FA 77mm. My heart is on FA 77mm since i don't have a fast lens.

question :
1. is a new FA 77mm need an adjustment (focus) in K-x ?
2. is FA 77mm F1.8 much faster than F2.4 to use in dim light? i don't how fast F1.8 is
3. is any issues about FA 77mm autofocus on K-x body?

thanks a lot for your advice

11-27-2009, 07:54 AM   #2
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1) that's impossible to predict. There's no formula to say which lens on which body might need a focus adjustment. It's not hard to do and with all the lenses I've used over the years, I've only needed to do it once.
2) The answer is yes. That's about 2/3 of a stop and one stop is twice as fast or in other words, requires half as much light for a given scene. So this can make a very big difference in a low light situation.
3)I don't think there are any issues to worry about with the 77mm and ask any owner, they love this lens.
11-27-2009, 01:37 PM   #3
Ash
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All the FA and DA limited lenses are exceptional, you should not be disappointed with any that you may want to get.

Both the 70 and 77 are well acclaimed and many users find it hard to say one is 'better' than the other.

But the extra stop of light in the 77 is worthwhile and it is a top-notch lens - one of the best ever made, I couldn't commend the gem any higher...
11-27-2009, 02:52 PM   #4
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Echoes all that Peter Z said above. I don't have the K-x (tho I dearly want one) but the 77 ltd operates flawlessly on my K20D.
Pros:
Sharp sharp sharp sharp sharp sharp (you get the idea)
Fast Fast (not as fast as it is sharp --- that basically is physically impossible)
Excellent color rendition
Execllent contrast
Relatively quick AF (tho I use MF most of the time anyway)
Excellent bokeh (out of focus areas are nice and smooth)
Pixie Dust ("3D" renderings of this lens seem almost magical)

Cons
Expensive
DOF vanishingly narrow at 1.8 especially in close focus situations
AF slower than DA 70

NaCl(As you can see the pros far outweigh the cons)H2O

11-27-2009, 05:01 PM   #5
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yep, i'm looking for fast, sharp, color, contrast and nice bokeh.

QuoteOriginally posted by Peter Zack Quote
2) The answer is yes. That's about 2/3 of a stop and one stop is twice as fast or in other words, requires half as much light for a given scene. So this can make a very big difference in a low light situation.
Now I can understand

thank you very much for all replies.
11-27-2009, 05:26 PM   #6
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QuoteOriginally posted by Ash Quote
All the FA and DA limited lenses are exceptional, you should not be disappointed with any that you may want to get.

Both the 70 and 77 are well acclaimed and many users find it hard to say one is 'better' than the other.

But the extra stop of light in the 77 is worthwhile and it is a top-notch lens - one of the best ever made, I couldn't commend the gem any higher...
+1.............................
11-28-2009, 09:13 PM   #7
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I wouldn't object to taking portraits with either the DA40 or the a 50/1.7 but you may find it otherwise. I do like the lookof my 35-70 zoom at the long end, for people.
11-29-2009, 02:37 AM   #8
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70 has a faster af speed than 77 and the size...

11-29-2009, 08:12 AM   #9
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To the OP, you won't go wrong with either lens. Both are very nice, though slightly longish portrait lenses.
I've read of some people being able to force the 77 into purple fringing, though I haven't noticed it myself.
Also consider the DA*55/1.4. I find it to be slightly short for portraits, but it is an excellent lens. If you like to do very close work, you might find the working distance to be a bit uncomfortable.

Last edited by Wheatfield; 11-29-2009 at 12:26 PM. Reason: Hiding the evidence
11-29-2009, 08:37 AM   #10
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Wheatfield,
Artemapei said the 70mm has faster *AF* speed, not that it is a faster lens.
11-29-2009, 12:25 PM   #11
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QuoteOriginally posted by Steve Beswick Quote
Wheatfield,
Artemapei said the 70mm has faster *AF* speed, not that it is a faster lens.
Thanks Steve. Post edited.
The 77 has a pretty lazy eye when it comes to AF speed.
Not that this should matter much in portraiture, unless you are doing something really wrong...
12-03-2009, 10:26 PM   #12
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I`ve just received a used 77mm at 59000 yen, like-new/mint condition.
yep, lazy AF speed

test drive with K-x today





great lens

many thanks to all of you
12-03-2009, 10:53 PM   #13
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Looks good Julia.
It'll give you a lifetime of excellent images.
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