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10-01-2015, 10:49 AM   #1
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The FA43 (vs DA40) - misfocusing?

Hi folks,

As I'm an avid film user who needs AF (too many debacles in the dark trying to get in-focus shots) and likes wide-aperture lenses, I've taken a liking to the FA 43 Ltd lens. I had a chance to try it out recently for testers on my K-7 and noticed that the focus would seem to miss here and there... inconsistently.

While I'm aware the DA40 (currently mounted on my cameras) is a very fast focusing lens and probably the fastest of the Pentax range, I think I'd be able to live with the FA43 ... but I find it sometimes either misses focuses (When the camera thinks it's in focus) or just racks back and forth where the DA40 nails it.

Has this been people's experience with the FA43 as well??

10-01-2015, 10:59 AM   #2
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I hear of this in most of the large aperture lenses. They seem to have a higher miss rate than those with smaller maximum apertures.
10-01-2015, 11:14 AM   #3
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I found the K-5 could struggle to get the 43 to focus sometimes. The K-3 seems to be more consistent.

The K-5 has never had the same occasional issue with the DA50. Neither with the 31, I think, but I haven't used that combination much (got the 31 after I got the K-3).

No matter, the 43 still is my favourite lens.
10-01-2015, 05:02 PM   #4
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I had a K7 and recently upgraded to the K3. It's the focusing system of the K7 that's the weak link. The K3 hits things I would have had no chance to get with the K7.

10-01-2015, 07:41 PM   #5
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The DA40 is more sure-footed than a mountain goat.
10-02-2015, 05:29 AM   #6
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QuoteOriginally posted by dugrant153 Quote
While I'm aware the DA40 (currently mounted on my cameras) is a very fast focusing lens and probably the fastest of the Pentax range
While I find the DA40 to be reliable, fast, and lovely, the new DC lenses focus faster than it.
10-02-2015, 12:01 PM   #7
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QuoteOriginally posted by dugrant153 Quote
Hi folks,

As I'm an avid film user who needs AF (too many debacles in the dark trying to get in-focus shots) and likes wide-aperture lenses, I've taken a liking to the FA 43 Ltd lens. I had a chance to try it out recently for testers on my K-7 and noticed that the focus would seem to miss here and there... inconsistently.

While I'm aware the DA40 (currently mounted on my cameras) is a very fast focusing lens and probably the fastest of the Pentax range

As for me, DA40 is rather common lens in term of AF. FA43 is better. DA40 has +2 AF adjustment. FA43 has 0.
10-03-2015, 03:35 AM   #8
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QuoteOriginally posted by ogl Quote
As for me, DA40 is rather common lens in term of AF. FA43 is better. DA40 has +2 AF adjustment. FA43 has 0.
QuoteOriginally posted by ogl Quote
As for me, DA40 is rather common lens in term of AF. FA43 is better. DA40 has +2 AF adjustment. FA43 has 0.

Does this mean that a lens with AF adjustment 0 is better than a lens with let's say +/-5?

10-03-2015, 04:12 AM   #9
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QuoteOriginally posted by zan Quote
Does this mean that a lens with AF adjustment 0 is better than a lens with let's say +/-5?
I mean FA43's AF is accurate and quicker than DA40.
10-03-2015, 04:59 AM   #10
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QuoteOriginally posted by ogl Quote
I mean FA43's AF is accurate and quicker than DA40.
I don't understand why some lenses are more accurate in AF than others.


FA43 has a screw-drive. Doesn't its AF accuracy depend on an inbody AF motor and camera system?
10-03-2015, 05:36 AM   #11
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QuoteOriginally posted by zan Quote
Does this mean that a lens with AF adjustment 0 is better than a lens with let's say +/-5?
No, it simply means that on his particular camera body and his particular lenses, the 43 needs no adjustment and the 40 does. Take the same two lenses on a different body, it could very well be the other way around. Or, two different copies of the same lenses on his body it could be the other way around.

Here's why: LensRentals.com - "This lens is soft" and other myths

Last edited by MPrince; 10-03-2015 at 05:41 AM.
10-03-2015, 07:26 AM   #12
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QuoteOriginally posted by zan Quote
I don't understand why some lenses are more accurate in AF than others.


FA43 has a screw-drive. Doesn't its AF accuracy depend on an inbody AF motor and camera system?
DA40 has screw-drive too.

---------- Post added 10-03-2015 at 07:28 AM ----------

QuoteOriginally posted by MPrince Quote
No, it simply means that on his particular camera body and his particular lenses, the 43 needs no adjustment and the 40 does. Take the same two lenses on a different body, it could very well be the other way around. Or, two different copies of the same lenses on his body it could be the other way around.
Yes But I think FA43 is faster (speed I mean) than DA40 at K-5IIs.
10-03-2015, 08:38 AM   #13
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QuoteOriginally posted by ogl Quote
Yes But I think FA43 is faster (speed I mean) than DA40 at K-5IIs.

It looks nicer too!
10-05-2015, 09:44 AM - 1 Like   #14
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I have both. Both of my copies have reliable AF, the 40 a bit faster (on my K-5) then the 43. In dark environment the 43 can hunt sometimes. the difference is more in the image quality: both very, very good and sharp, but the 40 is more contrasty,bright, and the 43 a bit more mystical, magic. But that's just my opinion...
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