Search results for 'back focus' - page 998
Zoom Lens- Close Focus Distance
Am I thinking about minimum focus distance as given in a lens Specification in the wrong way? I thought it was the smallest distance the lens would focus at, with depth of field either side. With your talk of DOF, you seem to be defining it as the smallest distance anything can be in focus at. i.e. ...
Posted by bforbes on 05/09/2011 - 15:08
Zoom Lens- Close Focus Distance
I think you're mixing things together a bit. Minimum focus distance is the minimum focus distanced measured from the sensor, nothing more nothing less. Dof is another thing not directly related to this. The Depth of field is more or less entwined with the magnification, the higher the magnifica...
Posted by Anvh on 05/09/2011 - 15:22
Zoom Lens- Close Focus Distance
That is what I said.:wink: The DOF does not come into the equation in order to answer my original question.:roll:
Posted by bforbes on 05/09/2011 - 16:08
Zoom Lens- Close Focus Distance
I didn't read that though because you said this I thought it was the smallest distance the lens would focus at, with depth of field either side. And that isn't true, DOF doesn't come into play when measuring the focus distance. So your latest statement is correct :) As for the original questio...
Posted by Anvh on 05/09/2011 - 16:30
Zoom Lens- Close Focus Distance
We are on a language thing here Stephan.:) I believed I was saying the same thing in both statements.:wink:
Posted by bforbes on 05/09/2011 - 17:45
Zoom Lens- Close Focus Distance
Maybe but then i find it strange that you say the thing i quoted from you. But ah well we're on the same wavelength now. :) But just the be sure the distribution of the DOF in regards to the focuspoint is not always 1:1, it's only that when at 1:1 magnification and it goes up to 1:∞ when y...
Posted by Anvh on 05/09/2011 - 17:58
Telephoto lens
I got mine from Cardiff Camera Centre back in July for that price and free next day delivery. It was via Ebay but I phoned them and payed over the phone. Very pleased with it so far.
Posted by Crossed-up on 07/09/2011 - 21:20
DA-star and problems with extension tubes
I've just bought one of and thought I'd have another go at macro with the DA* lenses. The problem is that the Teleplus (sorry: Teleplus) tubes I have - which have the electrical contacts - seem to freak out the K5. Now, it did it with the K7 and IIRC the K20D as well. It's almost like the camer...
Posted by MattMatic on 08/09/2011 - 12:20
DA-star and problems with extension tubes
I've tested my Kenko tubes (labelled: KENKO EXTENSION TUBE FOR P/AF, which is a bit of a misnoma because they lack both SDM contacts and the AF screw) as per Matt's configuration, but only with the DA* 16-50mm lens. They behave exactly as Matt has described, identically to his Teleplus tubes. ...
Posted by Mannesty on 08/09/2011 - 18:26
DA-star and problems with extension tubes
dougf8, Mannesty and Matt, I think you all deserve a pat on the back :) :) :)
Posted by Galoot on 09/09/2011 - 07:43
DA-star and problems with extension tubes
dougf8, Mannesty and Matt, I think you all deserve a pat on the back :) :) :) Thank you very much John. It's nice to have one's work appreciated and recognised, even if it was only scraping a bit of paint off of a few aluminium rings. In accepting this accolade, I'd just like to thank:- ...
Posted by Mannesty on 09/09/2011 - 09:18
DA-star and problems with extension tubes
Okay dokay :) Here's what I did with my Teleplus tubes: * Carefully removed the front plate * Inserted a thin strip of kitchen foil between the Digital pin and its spring * Put the foil over the adjacent screw hole * Replaced front plate (watch out for the alignment of all those pins!) I h...
Posted by MattMatic on 28/09/2011 - 09:52
DA-star and problems with extension tubes
Matt is wonderful :) Liking the macros of the watch. Excuse me but, whilst I agree that Matt is wonderful, check out thread . . . from 4 years earlier. :lol: Oh that one brings back memories, one of the very first posts I made IIRC, following Peters advice my scratched paint tubes are still in u...
Posted by fatspider on 28/09/2011 - 10:06
DA-star and problems with extension tubes
I've just bought one of and thought I'd have another go at macro with the DA* lenses. The problem is that the Teleplus (sorry: Teleplus) tubes I have - which have the electrical contacts - seem to freak out the K5. Now, it did it with the K7 and IIRC the K20D as well. It's almost like the camer...
Posted by ChrisR on 28/09/2011 - 14:17
PENTAX SMC AF 35-70mm F3.5/4.5 - First lens purchase and first disappointment!
Can you upload an image. You haven't said much really. :D Regards Chris I'll upload an image tomorrow as in my disgust I rapidly deleted them all of my card! @Algernon - the optics look fine and the general lens condition looks pretty much as new. The seller has got back to me and will give an...
Posted by bernado on 08/09/2011 - 19:12
PENTAX SMC AF 35-70mm F3.5/4.5 - First lens purchase and first disappointment!
Try a distant/landscape shot on manual focus using the 35mm end of the zoom and set the focus on the lens at infinity. Use f/8 or f/11 and 200-400ISO everything from about 6-8m to infinity should be in focus. If you are able to zoom the preview look on the camera screen to see what's in focu...
Posted by Algernon on 08/09/2011 - 21:07
PENTAX SMC AF 35-70mm F3.5/4.5 - First lens purchase and first disappointment!
Thanks for your comments I managed to grab some shots outside my office, the below link is fairly typical. Shot using Jpeg and Raw output - In camera image settings (contrast, saturation etc) set to neutral. ISO-400, 1/125 sec at f7.1, manual focus. Raw adjustments in ACR - minus 0.3 exposure, ...
Posted by bernado on 09/09/2011 - 16:53
PENTAX SMC AF 35-70mm F3.5/4.5 - First lens purchase and first disappointment!
The lens should be fine at any zoom setting, and if the same settings were used as with the kit lens, the in camera settings can be ruled out. Bear in mind it doesn't have a hood, unlike the kit lens, and in contra light will lose contrast. For a true assessment, shoot the same scene with both lense...
Posted by Pentaxophile on 10/09/2011 - 10:20
Tamron 200-500mm
The hard fact is that Tamron is abandoning the K-mount for some reason. It is a shame, as the 60mm F2.0 Macro, could be the perfect Macro/portrait lens that would be on a K-5. Nevertheless, Tamron is more small fry compared the Sigma, with a small range of lenses available. Needless to say, even Si...
Posted by Offertonhatter on 10/09/2011 - 20:22
DA 35 f2.4 AL
I'm surprised at how well it's put together ,the manual focus ring's nicely weighted ,really not what i was expecting . I actually might regret purchasing this lens as i've started looking at the Ltd lenses (just looking you understand) :D Almost forgot ....the bokeh's very very nice
Posted by melness on 09/09/2011 - 22:01
