Search results for 'back focus' - page 1114
Using Limiteds in mist & fog
I have a DA* 16-50 which I've rarely use - it's 12 months old. It's a nice lens, but it does not "feel" right for me. However, it 's weather resistant.Since buying this lens I have also started to collect Limiteds. I'm now deciding whether to sell the 16-50, at a big loss. So my question: it is a...
Posted by BarryE on 11/12/2013 - 10:19
Using Limiteds in mist & fog
Weather sealed lenses aren't airtight, so I'd doubt very much that the weather sealing can completely prevent ingress of water droplets the size you get in mist. So weather-sealed lenses probably aren't any more protected against mist than non-weather-sealed lenses. That said, the fact that the ai...
Posted by ChrisA on 11/12/2013 - 12:50
Using Limiteds in mist & fog
There is no problem using any lens in humid conditions, as long as when it's brought back inside it is left for a while to come to room temperature so that any moisture that has entered can evaporate. The problems only start if the moisture is trapped inside. I used many lenses when I was in ext...
Posted by Jonathan-Mac on 11/12/2013 - 21:38
Using Limiteds in mist & fog
[quote:3496ace15f="cardiff_gareth"]...That misting was on the middle lens elements !! Ok, so I guess you were using the lens for a reasonable length of time outdoors (allowing the camera and lens to cool), then brought it indoors. Then you zoomed the lens to the long end, sucking in a big gulp of...
Posted by ChrisA on 11/12/2013 - 23:49
Using Limiteds in mist & fog
It rained that hard that even Steve's 16-50mm focusing window misted up!! Or was it his 50-135mm! Either or one of his DA* lenses misted up! It was the 16-50 Gareth. It was definitely an extreme test of gear (and human endurance!) that day. I can also remember the look of horror on your face when I ...
Posted by Crossed-up on 12/12/2013 - 10:31
Using Limiteds in mist & fog
Thinking about where your misty bridge picture was taken, if you remember we all piled back into the Jeep and drove up the valley to the bridge. We were all soaking wet (especially DM who wasn't wearing waterproofs :shock:) and the the heater was on full blast That makes sense. Warm Jeep, high humi...
Posted by ChrisA on 12/12/2013 - 11:50
Problem with this item teleconverter
I bought this teleconverter from ebay but I can't seem to get it to work properly. I am using it with a 50mm f2.8 Pentax-A manual focus lens but when I use the teleconverter I lose he ability to set the aperture via the camera and also cannot shoot with automatic exposure. Without the converter the ...
Posted by Daydreamjay on 11/12/2013 - 14:25
Problem with this item teleconverter
It seems to be a similar porblem to several 'PKA' extension tubes where the earth return is not being made. Looking at the e-bay link it looks like the bottom of the TC is anodised so scratching the base of the TC as per JAK's photo should do the trick. If this doesn't work it might be that th...
Posted by petrochemist on 12/12/2013 - 12:44
Problem with this item teleconverter
Crikey it's like being told off by my teacher John haha. The reason I didn't want to start scratching stuff off is because then I wouldn't be able to send it back should that method not work... I hope this is an acceptable reason John... :|
Posted by Daydreamjay on 12/12/2013 - 13:44
Problem with this item teleconverter
I was just getting frustrated that you seemed to be ignoring this. I obtained mine in a package with a camera and some lenses so had nothing to loose. I too was sceptical but it worked. It is a Vivitar converter, the same model as yours. The only other 'solution' would seem to be to return it for a...
Posted by JAK on 12/12/2013 - 13:56
Problem with this item teleconverter
John, aperture was f8 and it was the 50mm f2.8 Macro lens - the older manual focus one that's supposed to be very sharp.
Posted by Daydreamjay on 12/12/2013 - 15:33
Focusing fast lenses wide open.
I sometimes find myself disappointed with the sharpness of my fast lenses, which is presumably down to technique. I've had a think about it and I suspect that the only way to get the focal point sharp is to use centre focusing on the eye or whatever, and shoot right away without recomposing in-came...
Posted by Darkmunk on 12/12/2013 - 10:13
Focusing fast lenses wide open.
I may not be understanding your comments clearly, but why is it wrong to use centre focus and then recompose?
Posted by LennyBloke on 12/12/2013 - 10:18
Focusing fast lenses wide open.
I may not be understanding your comments clearly, but why is it wrong to use centre focus and then recompose? Probably because the DOF is so shallow when using wide apertures that re-composing can alter the lens to subject distance and make the intended focal point go out of focus. Regards David
Posted by davidstorm on 12/12/2013 - 10:22
Focusing fast lenses wide open.
That's it David. But equally problematic, I suspect that wide open, select focus asks the lens to achieve focus using areas of the lens away from the centre that are soft, so the subject of the image will always be soft, and the best part of the lens has been squandered in an out-of-focus area ??
Posted by Darkmunk on 12/12/2013 - 10:45
Focusing fast lenses wide open.
I have never used centre focus and recompose, that's clearly wrong. So everyone who used an ME, MX, K2, etc did it wrong? Just look at any old camera manual and it shows you how to focus - you had to use a central split-image circle or central microprism, there was no alternative. Sorry you ...
Posted by JAK on 12/12/2013 - 10:56
Focusing fast lenses wide open.
I suppose it depends on how radically you recompose. I've not had problems with a 1.8 lens wide open, using centre focus then adjusting composition. I suppose it could be difficult using a faster lens still (?). I have never really got on with the faff of moving the focus points (on a K5).
Posted by CMW on 12/12/2013 - 11:10
Focusing fast lenses wide open.
It is absolute fact that recomposing will move the plane of focus off your subject, but only at the close distances I am talking about. i.e. sitting next to your child at the table or macro work. The example from your manual is so far away it would not be affected by recomposing.
Posted by Darkmunk on 12/12/2013 - 11:15
Focusing fast lenses wide open.
Focusing and recomposing would also bring us back to my original point that I think it's best to keep the subject in the centre and crop it later.
Posted by Darkmunk on 12/12/2013 - 11:23
Focusing fast lenses wide open.
I may not be understanding your comments clearly, but why is it wrong to use centre focus and then recompose? Probably because the DOF is so shallow when using wide apertures that re-composing can alter the lens to subject distance and make the intended focal point go out of focus. Regards David...
Posted by Fletcher8 on 12/12/2013 - 11:24
