Search results for 'back focus' - page 685
A few more from the Pentax 10-17mm Fish-Eye
Another very interesting collection Galloot. I cannot say I would personally care to use this lens for architectural photos very much but it is interesting to see how a small change in composition can make a huge difference to the result. The diagonal shots of the buildings like in the first one of ...
Posted by photo*ist on 16/10/2007 - 04:54
Tamron 75-250mm 104a
Hi all! I recently bought a K10D, and shortly after was given a load of old lenses by my dad, who'd had them in his attic for years. This is my first SLR so I'm a bit of a newb really... Most of them are nikon lenses, but there's a tamron one (the one in the title) which fits my camera. It sp...
Posted by Omid on 16/10/2007 - 00:00
Nikon to Pentax adapter
Sorry, no. I'm sure some Chinese eBay sellers have an adapter (they have ones for virtually any combination regardless of how well they actually work)... but you would lose infinity focus. Plus the obvious: You'd have no autofocus and would have to use stop-down metering... which would rather def...
Posted by ZaphodB on 16/10/2007 - 11:16
Nikon to Pentax adapter
has anyone heard of an adapter to fit an Nikon mount AF lens to a Pentax body (K10D)? You can get a manual focus adapter fairly easily. Unfortunately, because the Nikon lens to film distance is 1mm more than Pentax, you lose infinity focus. I got one to allow me to use a Nikon telephoto on m...
Posted by Reuben0 on 16/10/2007 - 19:43
Nikon to Pentax adapter
I'm also curious about this. We don't have to always lose infinity focus, do we? The Pentax flange-to-film (or flange-to-silicon) distance is 45.46mm. The Nikon distance is 46.50. So the distances are right -- the Nikon distance is greater than the Pentax distance. An adapter that will focus to...
Posted by Terrance13 on 23/10/2007 - 20:42
Nikon to Pentax adapter
I An adapter that will focus to infinity is theoretically possible, unless there is an issue with throat diameter. If the Nikon lens won't fit into the diameter of the Pentax hole, then that creates a problem. This is exactly the problem - the Nikon F lens mount is more or less the same diameter ...
Posted by Reuben0 on 23/10/2007 - 21:52
Autofocus no longer working
I've seen it mentioned here to take it off the A setting and wind the aperture ring back and forth a few times. Then make sure all the contacts on the lens and the camera body are clean (i.e. clean them carefully). Put it back in A, then try it again.
Posted by chirpy on 16/10/2007 - 21:58
DA 18-55 soft?
I've noticed that my DA 18-55 kit lens seems out of focus when set at infinity, but only when used near to the long end (50-55). I've been practising wide angle and keeping focus set to infinity at 18mm with F8 - F11. This has been giving me nice sharp images from foreground to background, but wh...
Posted by justgetoutandride on 18/10/2007 - 21:06
DA 18-55 soft?
Zoom lenses should keep in focus as you zoom, but may not always be designed to do so perfectly and may need some refocusing. A lens which has to be refocused after a zoom change is called a varifocal. However, th 18-55mm is definitely a zoom and any refocusing would be small. I think a more like...
Posted by johnriley on 18/10/2007 - 23:46
DA 18-55 soft?
I've had the same problem. I use manual focus to set mine on infinity for widefield astro shots but keep getting soft images, even at the wide end of the scale. I've now just bought a sigma f2.8 28mm manual focus (PKA) to do the job and given up with the kit zoom. I'm also looking at replacing th...
Posted by iancandler on 29/10/2007 - 01:26
DA 18-55 soft?
There is also another factor. The wider the angle of view the less the depth of focus. There could be two reasons here. If the lens is put together slightly out, any problem might not be apparent at the long end but it could affect the image at the wide end. It would be worth trying another 18-55 to...
Posted by Kim C on 29/10/2007 - 11:00
DA 18-55 soft?
The correct way to focus a zoom lens is to zoom in fully, focus up and re-frame.
Posted by gartmore on 29/10/2007 - 17:43
DA 18-55 soft?
The correct way to focus a zoom lens is to zoom in fully, focus up and re-frame. The logic behind this is that there is less DOF at the long end of a zoom, so focusing would be more accurate. A word of caution though that this depends on a zoom being a true zoom and holding its focus throughout...
Posted by johnriley on 29/10/2007 - 18:39
DA 18-55 soft?
The correct way to focus a zoom lens is to zoom in fully, focus up and re-frame. Please could you explain this a little more as I don't quite follow? :? Thanks Davem
Posted by davem on 29/10/2007 - 20:05
DA 18-55 soft?
The correct way to focus a zoom lens is to zoom in fully, focus up and re-frame. Please could you explain this a little more as I don't quite follow? :? Thanks Davem Davem, as John says, critical focus can only be achieved by focusing at the tight end of the zoom and this applies to both manu...
Posted by gartmore on 30/10/2007 - 08:16
DA 18-55 soft?
Getting back to the original subject of this thread it seems to me that there may be a wide variance of quality with the 18-55s. Some people like myself are very happy with their's whilst others seem very disappointed. I've had two and both have been rubbish. That's not rubbish compared to other mor...
Posted by niblue on 30/10/2007 - 09:39
DA 18-55 soft?
I'm generally using the 18-55 at the widest end, 18mm. occasionally 30-35, hardly ever at anything greater. It gets soft at the max zoom even when using auto focus. I'm also disappointed with the 50 -200 kit lens, it's not long enough for wildlife and not sharp enough for landscapes. I suppo...
Posted by justgetoutandride on 30/10/2007 - 11:52
DA 18-55 soft?
I would really like some wide manual primes: 10, 12. or 15mm (or whatever is available), for landscape images, and a 300 or greater for wildlife. Anyone got some for cheap (as in ridiculously cheap or even free)? :wink: :wink: Unless you want to spend a lot of cash then you'll probably need to ...
Posted by niblue on 30/10/2007 - 12:00
DA 18-55 soft?
Unless you want to spend a lot of cash then you'll probably need to forget primes as even manual focus ones can be expensive at those sorts of focal lengths. Your best option might be to consider a couple of Sigma lenses - the 10-20 for landscape, and the 70-300 APO for longer stuff. Both are muc...
Posted by justgetoutandride on 30/10/2007 - 12:05
16-50 - a problem lens?
Hi All, I came across this: http://forums.dpreview.com/forums/read.asp?forum=1036&message=24922733 Now I've had my 16-50 for 6 days and have not thoroughly tested it but there have been a few occasions when depressing the shutter button halfway I do not get a focus point, which I always got...
Posted by PeterM on 19/10/2007 - 15:38
