Search results for 'back focus' - page 1009
Infinity focus on 18-135
If you can wait until tomorrow I'll give mine a try. I can't say I have noticed any problems at infinity, but I tend not to try to focus on blue sky or blank walls.:wink:
Posted by Gwyn on 26/10/2011 - 19:19
Infinity focus on 18-135
Hmm, I have noticed that some or all of my lenses don't focus on blue sky. I however never pay attention to it and just focus on something else that has a bit of contrast. Sorry, I don't have a 18-135 to test.
Posted by sterretje on 26/10/2011 - 19:30
Infinity focus on 18-135
My DA 18-55 WR and Sigma 10-20 does, so did my DA*300 I'm amazed by this. I've never had a lens that will focus reliably on featureless anything at all, be it sky, wall, cloth, or anything else. You're saying you actually get 'green hexagon' focus confirmation, pointing the camera at uniform, fe...
Posted by ChrisA on 26/10/2011 - 21:12
Infinity focus on 18-135
As long as it works the other way round..... from blue sky to earth it should be OK! :mrgreen: :wink:
Posted by Algernon on 26/10/2011 - 21:36
Infinity focus on 18-135
Oops, actually they have a infinity hard stop which the 18-135 does not :oops::oops::oops::oops::oops:
Posted by DaveN on 26/10/2011 - 21:46
Infinity focus on 18-135
Oops, actually they have a infinity hard stop which the 18-135 does not True, but you'll still find that with many lenses, the hard stop at the infinity end of the focus throw is actually beyond infinity. The green hexagon at the bottom of the viewfinder is the only way of knowing whether the cam...
Posted by ChrisA on 26/10/2011 - 21:52
Infinity focus on 18-135
Actually, I use my sigma 10-20 almost exclusively on MF and hard focused to infinity
Posted by DaveN on 26/10/2011 - 21:56
Infinity focus on 18-135
Actually, I use my sigma 10-20 almost exclusively on MF and hard focused to infinity Well yes, but the depth of field is enormous with extreme wide angle lenses. If you're going to use a lens as a fixed focus lens and rely on DOF, you'd be better off setting the focus to the . Not the same th...
Posted by ChrisA on 26/10/2011 - 22:26
Infinity focus on 18-135
Probably your best target for infinity focus would be the moon?
Posted by Dangermouse on 26/10/2011 - 23:53
Infinity focus on 18-135
Just tried mine and the green light just blinks continuously when I try to focus on a dull grey overcast sky. Hope this helps.
Posted by Frankie on 27/10/2011 - 11:13
Infinity focus on 18-135
What Date is April 1st this year? :shock: :mrgreen: :wink:
Posted by Algernon on 27/10/2011 - 11:18
Infinity focus on 18-135
Don't know cause I haven't got a calendar!
Posted by Frankie on 27/10/2011 - 11:22
Infinity focus on 18-135
Unsurprisingly when pointed at a boring sky or blank wall mine doesn't focus at infinity. I know it focuses at infinity when used in the great wide open with enough contrast for the AF. Just out of interest I tried the 17-70 too and that of course also didn't focus on blankness either. As I ...
Posted by Gwyn on 27/10/2011 - 11:42
Infinity focus on 18-135
I don't plan to try it, since I don't like it when hunting AF makes a lens whomp into the stop. But I wonder if most lenses end up around the infinity mark when they give up trying to focus? I'd be surprised if you could get actual focus confirmation with any lens if you point it at genuinely ...
Posted by ChrisA on 27/10/2011 - 11:56
Infinity focus on 18-135
In my experience they will flick from one end of their range to the other and give up around infinity. Handy if you want a lens to retract before turning the camera off, just point it at a blank wall, half press, and the lens eventually retracts!
Posted by Dangermouse on 27/10/2011 - 15:44
Infinity focus on 18-135
Unsurprisingly when pointed at a boring sky or blank wall mine doesn't focus at infinity. I know it focuses at infinity when used in the great wide open with enough contrast for the AF. Just out of interest I tried the 17-70 too and that of course also didn't focus on blankness either. As I ...
Posted by DaveN on 27/10/2011 - 16:02
Infinity focus on 18-135
My experience of the 18-135 with K200D is that there are times when it won't focus. Both the 18-55 and the 55-300 on the K200 will hunt and then give up. The 18-135 gives up without hunting. Moving to a high contrast area or else manually de-focus the lens then "kick-starts" it. Perhaps this lens...
Posted by timd on 28/10/2011 - 12:23
Infinity focus on 18-135
O... the hard stop at the infinity end of the focus throw is actually beyond infinity.... Perhaps this thread should be "..to infinity and beyond...."
Posted by timd on 28/10/2011 - 12:26
Infinity focus on 18-135
Just to jump back, MF lenses tend to have a hard stop at infinty, AF don't. I think it's to protect the lens from damaging itself.
Posted by greynolds999 on 28/10/2011 - 13:32
Infinity focus on 18-135
Just to jump back, MF lenses tend to have a hard stop at infinty, AF don't. Eh? Mine do. The 18-135 is the only one I've ever had that doesn't. Edit: or do you mean exactly at infinity? Edit2: actually, my FA 50 1.4 has a hard stop which corresponds exactly to the infinity mark. My others s...
Posted by ChrisA on 28/10/2011 - 13:56
