Search results for 'back focus' - page 1196
DA* 50-135 loose focus ring
Thanks guys for your attention. John, unfortunately I can't compare it physically because no local shop here, but some people on other forums said exactly the same as you about quickshift mechanism. One of the most experienced user there told me that all of his star lenses behive that way. Only o...
Posted by Lev on 14/01/2018 - 17:36
DA* 50-135 loose focus ring
Mine was new. I also have the 300, which I haven't checked. I actually checked my 50-135 before answering your post. As I said, no problems with it, other than the fact that it's slow to focus, which is a characteristic of this lens too!. Personally, I'd just get on and enjoy making photos with i...
Posted by JohnX on 14/01/2018 - 18:44
DA* 50-135 loose focus ring
Thanks a lot John! Now as you mentioned the DC motor, I've remembered that during testing I've immediately checked my 16-85 lens because it also has quickshift. It also has this thing but because its focus ring in tiny compared to 50-135 and located towards mounting, you barely notice it but it ...
Posted by Lev on 14/01/2018 - 19:16
DA* 50-135 loose focus ring
John, here's video: sorry for annoying background
Posted by Lev on 14/01/2018 - 22:28
DA* 50-135 loose focus ring
That looks like backlash. link to Wikipedia
Posted by bforbes on 15/01/2018 - 10:14
DA* 50-135 loose focus ring
bforbes, thanks, yes I know that this is backlash, I just wonder if it should exists in this lens
Posted by Lev on 15/01/2018 - 10:31
DA* 50-135 loose focus ring
Morning Lev. Checked my 300. The backlash is not quite as pronounced as the 50-135, but then again it's a prime so doesn't have quite such a complex focussing mechanism as a zoom. There is also a discernible 'knock' if I use the Quick Shift past infinity. I guess it's one of those things. If you...
Posted by JohnX on 15/01/2018 - 11:42
DA* 50-135 loose focus ring
hi!! Don't be surprised, though, if the replacement exhibits exactly the same "issue" Well, that's what I'm afraid of! Did you see my video? I wonder if that is look like yours? exactly like that or close to that. thanks for your help I really appreciate!
Posted by Lev on 15/01/2018 - 11:54
DA* 50-135 loose focus ring
I have the DA* 60-250 lens which is of the same era. It also has the "backlash" sound but you have to be listening out for it. It is also normal for the click you hear when you reach the extremes of focus. As long as the focus ring turns smoothly I would not worry. On your video from 30 seconds o...
Posted by pschlute on 15/01/2018 - 12:31
DA* 50-135 loose focus ring
pschlute, absolutely right!! It becomes stiff in either way and I think it's normal, I'm more worried about backlash, as long as I'm guessing, more free play you have, more loudly you'll hear the clacking sound. My main concern is how much this gap or dead zone should exist in good copy? in my case...
Posted by Lev on 15/01/2018 - 12:46
DA* 50-135 loose focus ring
I would be more concerned with the fact that the focus ring is not smooth throughout it's travel. Your video appears to show it quite "notchy" turning towards infinity, and if that is indeed the case I would return the lens for a replacement.
Posted by pschlute on 15/01/2018 - 13:17
DA* 50-135 loose focus ring
no no, the focusing ring movement itself is very smooth (well it's bit loose until gears engage each other), not as stiff as zoom ring though but it's smooth.
Posted by Lev on 15/01/2018 - 13:40
DA* 50-135 loose focus ring
Did you see my video? I wonder if that is look like yours? exactly like that or close to that. Your lens definitely has more backlash than mine, although the 'click' is the same if I operate my focussing ring quickly. It also looks like your focussing ring action is looser than mine. Whether tha...
Posted by JohnX on 15/01/2018 - 17:08
DA* 50-135 loose focus ring
Yeah when you pay $1200 other things are holding a little bit :) My cousin asked me today if I took some portraits, he knows that I was waiting for it for a long time and finally got it couple of days ago, and when I answered no he looked at me questioningly... why? little bit astonished )) Thank...
Posted by Lev on 15/01/2018 - 20:38
DA* 50-135 loose focus ring
I've sent it back for replacement. I've discovered that it also had front/backfocusing on wide angles and it was varying front to back shot to shot :( so sad it has stunning image quality, spent 2 weeks testing it and finally gave up. Can't tell you guys how I feel, it's like someone teared my he...
Posted by Lev on 30/01/2018 - 19:00
So, you want a 28mm lens in m42 fit
So many to choose from so how about this one for starters. https://www.pentaxforums.com/userreviews/vivitar-28mm-f-2-8-close-focus.html I have the PKA version but they are available in m42 mount. Very close focussing too. Good luck with your search.
Posted by Defragged on 28/01/2018 - 22:23
So, you want a 28mm lens in m42 fit
So many to choose from so how about this one for starters. https://www.pentaxforums.com/userreviews/vivitar-28mm-f-2-8-close-focus.html I have the PKA version but they are available in m42 mount. Very close focussing too. Good luck with your search. what is the difference between Vivitar 28mm ...
Posted by bforbes on 28/01/2018 - 22:34
So, you want a 28mm lens in m42 fit
The close focus version is highly regarded and more sought after for amongst other reasons the fact that it does focus so very, very close. Rather than me trying to explain, have a look here for a detailed study of all the variants:- http://photografica.robinparmar.com/vivitar.html
Posted by Defragged on 28/01/2018 - 23:39
So, you want a 28mm lens in m42 fit
Takumar f3.5 28mm is a nice lens. Like all Taks it handles well and gives glorious colours. The A/M switch is handy too. I would be fitting the lens to an adapter with no connections. So does it matter about setting the A/M switch, or does it matter if there is no A/M switch? Use it as a stop down. ...
Posted by womble on 29/01/2018 - 22:24
So, you want a 28mm lens in m42 fit
The third pin only occurs on Super-Multi-Coated Takumars and is for the F, ES and ESII models that meter wide open, and thus you do not need to stop-down. The one time I absolutely insist on a genuine Pentax part is the M42 to K adaptors. So many of the copies have problems with with the third p...
Posted by womble on 30/01/2018 - 09:36
