id like to have known what the hell a screw drive is, cuz ive no idea wtf this entire video is supposed to be doing? i just bought a pentax K-5 and was looking for videos on it, and ran across this one, dunno why i clicke don it, i dunno anything about cameras right now, i just am starting to get into it. sometimes i think smart need to pretend they are dumb right before they do a video like this because half of everyone that watches it will be dumb, 486 views, and 29 thumbs up from smart people the rest were like me, wtf is happening :(
@@seanc8054 late but i hope this information is still useful. screw drive is a type of af motor. its integrated into the body while sdm is inside the lens. the sdm motor is prone to failure but you could "convert" the lens to screw drive when it fails
Although I would love to extrapolate, since I only have the one lens, my sample size is an n of 1. However, knowing the similar technology employed on the earlier SDM lenses (the ones capable of converting) I am reasonably confident in saying "yes - the screwdrive operates faster and more reliably than their SDM autofocus".
@@allthelux As PentaxTips said, it is about priorities, but also note that Pentax use the "SDM" moniker for a wide range of AF implementations. There are really slow ones using micro-AF motors and really fast ones using big ring motors.
@@coolcat23 When people talk about the slow SDM they're usually discussing the system used in the older DA* lenses as well as the DA 17-70. This one is more prone to failure than other types of focusing motor they've used in their 'SDM' lenses.
Great test!! Great algorithm, logic and analyse!!!
Thank you, this channel is a must
Exactly the video I was looking for since getting the K3iii :)
thanks for the tests
Nice. Would have been good to accompany this with a sharpness analysis, i.e., check whether the screw-drive AF results are as good as the SDM results.
id like to have known what the hell a screw drive is, cuz ive no idea wtf this entire video is supposed to be doing? i just bought a pentax K-5 and was looking for videos on it, and ran across this one, dunno why i clicke don it, i dunno anything about cameras right now, i just am starting to get into it. sometimes i think smart need to pretend they are dumb right before they do a video like this because half of everyone that watches it will be dumb, 486 views, and 29 thumbs up from smart people the rest were like me, wtf is happening :(
@@seanc8054 A quick Google search would fix that for you. Stop being lazy.
@@seanc8054 late but i hope this information is still useful. screw drive is a type of af motor. its integrated into the body while sdm is inside the lens. the sdm motor is prone to failure but you could "convert" the lens to screw drive when it fails
thank you , very informative
Can this be generalized to all SDM -> Screwdrive conversions, or just the lens and body combinations you tested?
Although I would love to extrapolate, since I only have the one lens, my sample size is an n of 1.
However, knowing the similar technology employed on the earlier SDM lenses (the ones capable of converting) I am reasonably confident in saying "yes - the screwdrive operates faster and more reliably than their SDM autofocus".
@@PentaxTips That's very surprising, as I thought SDM technology was a step up from the screwdrive. Thank you for a great video and test!
@@allthelux I guess it all depends on what you want to get out of the lens. Speed or silence!
@@allthelux As PentaxTips said, it is about priorities, but also note that Pentax use the "SDM" moniker for a wide range of AF implementations. There are really slow ones using micro-AF motors and really fast ones using big ring motors.
@@coolcat23 When people talk about the slow SDM they're usually discussing the system used in the older DA* lenses as well as the DA 17-70. This one is more prone to failure than other types of focusing motor they've used in their 'SDM' lenses.
Love it!