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10-05-2008, 11:00 PM   #76
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QuoteOriginally posted by mattdm Quote
Really? Those two (the FA Limiteds) are definitely slower than the DA 40mm Limited on the K10D.
Yes. Very slow.
FA Limited is made with consider for MF users.. so focus ring is very long.
but DA40Limited is vert fast lens in Pentax lenses.. small and light, and short focus ring..(for AF)

SLR?? Pentax ??
this is Still B.'s Limited lens AF speed comparison, and

SLR?? Pentax ??
this is my recorded sound of 50-135.


Lens 무한대→최소 | 최소→무한대 | 왕복
=================================================
40/2.8 Limited : 0.142 0.134 0.635
21/3.2 Limited : 0.167 0.158 0.680
70/2.4 Limited : 0.252 0.240 0.850
31/1.8 Limited : 0.280 0.284 0.917
43/1.9 Limited : 0.425 0.445 1.227
77/1.8 Limited : 0.480 0.518 1.385
35/2.8 Limited : 0.947 0.967 2.264
50-135/2.8 : 0.796 0.741 2.353

50-135 is very slow. almost 35 Macro Limited...
It can't speed up by changing camera.. this is micro motor's limit.
I hope Pentax's new SDM will come with Ring type motor.


Last edited by miriya; 10-05-2008 at 11:06 PM.
10-06-2008, 12:00 AM   #77
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Gee, now we've got people complaining about the focusing speed of the DA* 50-135.

miriya, to make a comparison of focusing speed compared with prime lenses of different focal length, different maximum aperture, with a shorter focus throw, that has fewer elements, lighter weight, of different focal length and different construction is plainly absurd simply because there are so many variables involved.

Heck if you want to compare, even my FA 135mm focuses a tad quicker but so what does that prove? They are different lenses, so you'll get different results.
10-06-2008, 12:13 AM   #78
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Useless results. DA*50-135 is good in speed, to say honest.

creampuff is right 100 000 times...
10-06-2008, 12:18 AM   #79
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QuoteOriginally posted by miriya Quote
now time, Pentax's KAF3 lens are two..
17-70mm f/4 and 55mm f/1.4

I heard 17-70's AF is not very fast, so I am afraid to it's not Ring USM..
KAF3, still micro USM?

DA☆50-135 is slower than FA77mm f/1.8 Limited and FA43mm f/1.9 Limited!
Absolutely rubbish...

FA77 and FA43 are slowest lenses. Try DA*50-135 and understand that it's nonsense.

10-06-2008, 01:23 AM   #80
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QuoteOriginally posted by ogl Quote
Absolutely rubbish...

FA77 and FA43 are slowest lenses. Try DA*50-135 and understand that it's nonsense.

don't neglect me, ogl.
sometimes I think you want making me fool.
if not, be politely.

I used that 50-135 about 3months with 20,000 pics.
77limit, it makes good pics but slow lens, I used it 5months with 40,000pics.

both they are truly slow, but I don't care when I used it.
because my AF range is very short(I can't express better with my poor English)
but.. sometimes I misAF, and out-of-focus to in-focus, I feel slow.
zizzzzz-- zizzzzzz----

And I used Canon 70-200/2.8 IS one day, I felt what is real fast AF lens.
that is speed difference between Ring-type motor and micro-type motor

hey guys I don't trolling. I am just introduce my research and shows some fact.
50-135 is slower focus than 77,43Limiteds.
so I just want KAF3 with Ring-type SDM.
whats problem? Am I 'rubbish'? It sounds not comfortable for me.
I don't want any trouble.

Last edited by miriya; 10-06-2008 at 01:57 AM.
10-06-2008, 01:50 AM   #81
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QuoteOriginally posted by creampuff Quote
Gee, now we've got people complaining about the focusing speed of the DA* 50-135.

miriya, to make a comparison of focusing speed compared with prime lenses of different focal length, different maximum aperture, with a shorter focus throw, that has fewer elements, lighter weight, of different focal length and different construction is plainly absurd simply because there are so many variables involved.

Heck if you want to compare, even my FA 135mm focuses a tad quicker but so what does that prove? They are different lenses, so you'll get different results.
I think we have something misunderstanding.

my test is 'close-lens capped' test.
test environment is under control.

I recorded AF sound over 10 times and I gettered shorter values.
shortest to infinity, infinity to shortest, and coming and going.

not affected by light situation and maximum apperture.
So I think this experiment is objective, and it is enough to compare simple focus speed between lenses.

If you think I am wrong, correct me.
10-06-2008, 02:34 AM   #82
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QuoteOriginally posted by miriya Quote
I think we have something misunderstanding.

my test is 'close-lens capped' test.
test environment is under control.

I recorded AF sound over 10 times and I gettered shorter values.
shortest to infinity, infinity to shortest, and coming and going.

not affected by light situation and maximum apperture.
So I think this experiment is objective, and it is enough to compare simple focus speed between lenses.

If you think I am wrong, correct me.
Well, you are wrong.

Focus speed is not correlated with the time a lens takes to track back and forwards, its "travel time"

I've checked my DA* 16-50 against a friends Canon L 135mm f2.0 prime. The Canon takes almost a second long to complete its travel time.

Yet the Canon AF's far faster than the Pentax. We tried on a number of other lenses as well, there are far more variables involved than just travel time.
10-06-2008, 08:29 AM   #83
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miriya, thank you for the informed reply based on extensive use.

11-04-2008, 12:09 AM   #84
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With all the technical talk about these lenses, does anyone just appreciate how darn *good* the DA* 55mm looks?

It'd be totally redundant for me at this point but I'd love to see that on my K10D...

QuoteOriginally posted by Douglas_of_Sweden Quote


Ohh, I wan't this one, but I've already got the K55/2.0, FA50/1.4 and A50/1.7, how to motivate this one? Hope someone will post pictures made with this lens soon!
11-04-2008, 12:26 AM   #85
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I have a good news and a bad news for you:

First the good one. The lens looks in reallity mutch better than on the pics. I saw it on the Photokina and was mutch impressed! The size is perfect for the K10/20D body.

The bad news. I ordered the DA55* by a german dealer two weeks ago. The dealer stayed personly in Hanoi last week. He told me yesterday that in the factory in Hanoi they still have not running the production of the lens and that he thinks that the lens will arrive earlliest at the end on January. I hope he will be wrong, but I dont have mutch hope...

Best,
Rainer
11-04-2008, 03:43 AM   #86
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To say honest, DA*55 is very good lens and great work of Pentax.
It's new lens with new picture
11-05-2008, 01:21 AM   #87
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QuoteOriginally posted by miriya Quote
don't neglect me, ogl.
sometimes I think you want making me fool.
if not, be politely.

I used that 50-135 about 3months with 20,000 pics.
77limit, it makes good pics but slow lens, I used it 5months with 40,000pics.

both they are truly slow, but I don't care when I used it.
because my AF range is very short(I can't express better with my poor English)
but.. sometimes I misAF, and out-of-focus to in-focus, I feel slow.
zizzzzz-- zizzzzzz----

And I used Canon 70-200/2.8 IS one day, I felt what is real fast AF lens.
that is speed difference between Ring-type motor and micro-type motor

hey guys I don't trolling. I am just introduce my research and shows some fact.
50-135 is slower focus than 77,43Limiteds.
so I just want KAF3 with Ring-type SDM.
whats problem? Am I 'rubbish'? It sounds not comfortable for me.
I don't want any trouble.
Don't worry Miriya, you're not crazy, the 50-135 is relatively slow to AF and it's particularly evident when you go from far to close range.

I have used this lens on a k10 and a K20, alongside a 30D and a 70-200f4L and there is no comparison, the Canon setup is much snapier.

There seems to be more than sheer "rotating" speed though.

One thing I noticed is that the Pentax lens always focused at the same speed whereas the Canon lens can go slowly when looking for some target and suddenly "jump" into focus when some contrats is found. There must be some algorithmics wizardery going on here...

AF performance is influenced by various factors and I hope pentax can find a way to get up to speed with the bests but I sincerely hope they did not issue lenses with SDM motors that are just unable to produce better speed, even with better algorithms in future cameras.

I am looking forward to trying the 60-250 in two weeks in Paris's photo show to see how focusing speed is faring...
11-05-2008, 04:51 AM   #88
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I want *55mm now. NOW.

c[_]
11-05-2008, 06:22 AM   #89
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I used the 50-135 (with a 540 flash for AF-assist) last week at a wedding and it was very hard to catch those moments compared to my Nikon system In good light it's pretty quick though.

I can't wait for longer primes, I love the DA limiteds. They're very fast! I hope Pentax makes a 135mm DA limited (or somewhere in that focal length).
11-05-2008, 07:01 AM   #90
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Is the DA* 60-250 better than Sigma/Tamron 70-200/f2.8? Which is more desirable?
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