[Dave's clichés]

Is there any news on the the Sigma 18-35mm zoom which was tested here a few months ago? There were issues with accuracy of the AF and further details were to follow, did anything come to fruition? All seems to silent on the follow up!

[i_trax]

well, I have one and am using it with K-3, K-5IIs and K-s1 , so far no problem noticed......
Great lens!

[Docrwm]

Several threads discussing its unreliable and unpredictable AF. Numbers like 70% accurate have been bandied about regularly.

[mike.hiran]

I have one and use it regularly without complaints. Nice lens for me...

[Adam]

We're still in the process of testing additional copies of the lens. Would rather not jump the gun in making conclusions, but so far it's looking like Alex's findings in the in-depth review are valid.

[Dave's clichés]

OK thanks for your reply Adam. Very strange that some have no complaints though as seen here!

[Docrwm]

OK thanks for your reply Adam. Very strange that some have no complaints though as seen here!

Not so strange. There is a well established social psychology theory that the more you pay for something the less likely you are to find fault and the more likely to praise it over the alternatives. There was a great study where they explained a radio to a group of 100 or so folks. They then divided them into two equal groups in separate rooms and gave them questionnaires about the radio. One group was told the radio was going to sell for $9.95 and the other group was told $99.95. The $9.95 group said the radio was a piece of garbage, would break, etc. The $99.95 group said is was an outstanding radio and everyone should own one. Same radio + different prices = different impressions. The 18-35 costs a LOT........

[MadMathMind]

OK thanks for your reply Adam. Very strange that some have no complaints though as seen here!

I do not have huge amounts of trouble with my lens either.

https://www.flickr.com/photos/127442034@N03/sets/72157649140156878/

I shoot mine in Av, TAv, or M mode, manual selection of focus point always. I usually press the AF button twice, but maybe only once at f/8 and such.

Not so strange. There is a well established social psychology theory that the more you pay for something the less likely you are to find fault and the more likely to praise it over the alternatives

I don't think that really works for malfunctions and focus issues. I don't think the $99.95 group would have given the radio a pass if it didn't make any sound or sounded like a bullhorn.

[Kevwaly]

Is it possible that 1 out of X(?) had consistent AF? I have used mine very skeptically and still find it to be sharp. I would tend to trust Alex's tests without a doubt...but I feel like there's room for individual differences in lenses. Could it be that with the production of the18-35 there was less uniformity and consistency so a few lucky souls got gems while many received AF that was just a bit off?

[hjoseph7]

Not so strange. There is a well established social psychology theory that the more you pay for something the less likely you are to find fault and the more likely to praise it over the alternatives. There was a great study where they explained a radio to a group of 100 or so folks. They then divided them into two equal groups in separate rooms and gave them questionnaires about the radio. One group was told the radio was going to sell for $9.95 and the other group was told $99.95. The $9.95 group said the radio was a piece of garbage, would break, etc. The $99.95 group said is was an outstanding radio and everyone should own one. Same radio + different prices = different impressions. The 18-35 costs a LOT........

I don't know about studies but I know I'm usually happier with an item I got a great deal on !

[Dave's clichés]

Not so strange. There is a well established social psychology theory that the more you pay for something the less likely you are to find fault and the more likely to praise it over the alternatives. There was a great study where they explained a radio to a group of 100 or so folks. They then divided them into two equal groups in separate rooms and gave them questionnaires about the radio. One group was told the radio was going to sell for $9.95 and the other group was told $99.95. The $9.95 group said the radio was a piece of garbage, would break, etc. The $99.95 group said is was an outstanding radio and everyone should own one. Same radio + different prices = different impressions. The 18-35 costs a LOT........

Next time I buy a radio I'll bear that in mind, but when it comes to lenses I'll use the opposite of that theory!

[drypenn]

I think that that study doesn't apply with regards to Pentax lenses. A perfunctory glance of the lens review leaves me feeling that the cheaper lenses have better ratings than the supposedly better glasses. Why? Maybe they're really better, or perhaps there are more expectations on pricier items.

Or just maybe, users are willing to forgive an $80 M 50/1.4 and rate it at 9.25 versus a much better $640 DA*55/1.4 rated at a lower 9.18? I have experienced both glasses, and personally, if they are on the same scale and ignoring price difference, if the DA*55 is at 9.18-- the M50/1.4, with all due respect, should not be rated more than 8.0

(Or another case: the $100 M50/4 (9.56) beating the $400 K 50/1.2 (9.32)?)

[Docrwm]

I don't know about studies but I know I'm usually happier with an item I got a great deal on !

Happy and willing to defend in the face of controverting fact are not the same thing at all. Funny but everyone thinks they're immune, it's the "Oh that may be true of others phenomenon".

[drypenn]

Happy and willing to defend in the face of controverting fact are not the same thing at all. Funny but everyone thinks they're immune, it's the "Oh that may be true of others phenomenon".

Doc, I have a better explanation. We, forum members, cannot be really considered a representation of the much larger, general public

[Docrwm]

Doc, I have a better explanation. We, forum members, cannot be really considered a representation of the much larger, general public

Or, in other words, it Might be true of others, but......