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01-31-2011, 08:45 PM   #16
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I've jut got this 28-105/3.2-4.5 using with K-x (firmware 1.02) and facing the same problem of focus hunting near 105 end (above 80-90mm I think).

Thanks for Kfried tip of using finger. I think it quite easy to use this tip when you are at the 105 end. Will use it for a while to see if it can replace my Kit DA18-55 and DA50-200 or not.


Last edited by chipvn; 01-31-2011 at 09:16 PM.
01-31-2011, 09:44 PM   #17
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I'm very satisfied with the re-badged FA 28-105/4 - 5.6 which pairs well with a DA 16-45 with good overlap for general rural scenic use. For sharpness, it seems to fit somewhere between the DA 18-55 or 50-200 and the Tamron 28-75/2.8.

I tried to replace it with the Tamron 24-135 which turned out to be much larger and heavier and offered no noticeable improvement in general results.

It's sort'a like havin' a utility infielder on the bench that bats .245 and never gets injured -- just too useful to turn loose.

H2
02-09-2011, 12:09 PM   #18
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another dissenting opinion

I think this is a rare instance where the reviews on Pentax forums get it wrong.

Most of the reviews I found suggested that the 3.2-4.5 is optically superior to the the previous 28-105 versions. It is at least safe to say that Adam's opinion is not universally held.

My own experience is that it is tough to find this lens on the used market, as those that have them don't part with them easily.

I love it; it is unbelievably light and compact (retracted, about the size of the 18-55 kit lens). In terms of rendering, I find that the colors are pleasing. I typically have to push the blacks in post processing a bit, but once done, the images are very nice. A great general purpose walkabout lens.

On the focusing issue, it really seems to be the very top of the range. Backing off even slightly has solved any focus lock issue I've experienced, every time.

-s
12-18-2013, 01:46 AM   #19
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Pleasant surprise: K3 cures AF lock problem

I just found out that the issue is solved with my K3. This holds for my FA 24-90 as well. It would be interesting to know it it solves similar AF lock issues that have been reported with the FA 17-70.

01-06-2014, 04:07 PM   #20
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QuoteOriginally posted by kfried Quote
I just found out that the issue is solved with my K3. This holds for my FA 24-90 as well. It would be interesting to know it it solves similar AF lock issues that have been reported with the FA 17-70.
I have also had similar long-end AF locking issues with a number of Pentax zooms, in particular the DA17-70/4 and the FA28.105/3.2-4.5. Agree that applying a small amount of friction to the ring with your finger can sometimes help.

Anecdotally, in the very brief time I've had the K-5ii it seems like I'm having better luck with the long end of the DA17-70/4, so it's possible that the improved AF algorithms and greater AF light sensitivity in the K-5ii and K-3 may have improved that situation.

To the original poster, the FA28-105/3.2-4.5 is very light and compact for its range and speed. The lens I prefer for this job though is the FA24-90/3.5-4.5, which with its 24mm wide end is probably a little better-suited for APS-C DSLR duty. It's one of the sharpest zooms I've tested, better at 70mm than the 28-105 and DA17-70 (I explicitly tested this length with many lenses I had on hand, only the DA70/2.4 was better than the 24-90). My recollection is that the 17-70 was better than the 28-105. The 24-90 is more expensive than the 28-105 and ~1/3 stop slower across the range (28-105 is f4 up to 70mm, while 24-90 is f4 up to 50mm) but still a bargain compared to buying any of the newer DA zooms, most of which don't quite match it optically.

These lenses are of similar vintage and construction (both have IF and bayonet-mounted petal hoods), but for whatever reason the FA28-105/3.2-4.5 has a better damped focus ring, while the 24-90 has a 'barely'-damped ring.
01-06-2014, 04:14 PM   #21
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I had some long-end AF locking issues with Pentax K-r and K200D. On Pentax K-30 the FA 28-105 F3.2-4.5 AL [IF] zoom rocks without hunting issues ..
01-06-2014, 05:16 PM   #22
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QuoteOriginally posted by skoobie Quote
I think this is a rare instance where the reviews on Pentax forums get it wrong.

Most of the reviews I found suggested that the 3.2-4.5 is optically superior to the the previous 28-105 versions. It is at least safe to say that Adam's opinion is not universally held.
I'll concur with this. I've been shooting Pentax DSLRs since the DS was new, and the consensus had always been that the f3.2-4.5 version of this lens was the best of the 3 optically. I personally tested the f3.2-4.5 version against the PZ version and chose the f3.2-4.5 even though it was only available in silver at the time, and I had really wanted black.

I still have the lens, though I don't use it much. I'll generally choose my Tamron 28-75 f2.8 or my Sigma 17-70 f2.8-4.5 DC, but the FA 28-105 still gets the call if I want to travel light. The other two are beasts in comparison.

I have not encountered AF issues with this lens on any of my bodies (DS, K100DS, K10, K20, K-7, K-5, K-5IIs, or the new K-3), which doesn't mean they don't exist. . . I just haven't had that experience.

Scott
01-07-2014, 02:13 AM   #23
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The black one mounted on K-30:



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