Search results for 'back focus' - page 997
New Samyang lens
Size sometimes matters, my 85mm f1.4 has been used a lot this wedding season, clients are amazed at what we know is bokeh. I think everyone expects enormous DoF because of P&S cameras. Might still buy the 8mm for a big shoot next week but procrastination is always the thief of time :( Hi Ken how do ...
Posted by gartmore on 02/09/2011 - 09:11
New Samyang lens
My 85mm is very impressive at f/1.4 providing I can focus it correctly - although with care it can be focussed quite precisely via the viewfinder. Stopping it down a couple of stops gives very sharp results indeed. The focus does shift slightly at smaller apertures, that's going to give worse resu...
Posted by karma mechanic on 02/09/2011 - 10:02
New Samyang lens
Nice focal length and speed, but boy it's a bigun! I hope the focus ring is not as stiff as the 35mm version I tried at Focus.....But then again old pentax lenses do have a creamy smooth focus ring that not many other makes can meet....:wink:
Posted by Offertonhatter on 02/09/2011 - 18:38
Technical Question about using older lenses
Please excuse me if this is a familiar question but im after a bit of advice about fitting lenses. I have a K-x and am toying with the idea of getting a 50mm lens from a popular auction site. whats is the score with fitting an old lens to my camera? how functional will a lens be, i appreciate ...
Posted by sheepsteeth on 01/09/2011 - 16:42
Technical Question about using older lenses
Have a read about the 'catch in focus' mode on the KX, worth playing with if you are nervous about accurate focusing.
Posted by JamieT on 01/09/2011 - 22:52
Technical Question about using older lenses
superb thanks so much for the help. The main reasons i chose a pentax were the tactile feel of the camera (i dont how much that is worth to other people but the camera physically feels good to me) and the opportunity to make use of a vast array of older yet highly rated lenses for very little...
Posted by sheepsteeth on 01/09/2011 - 22:58
Technical Question about using older lenses
I have the "A" series 50mm f1.7 and it's a cracker. I also have an "M" 200 f4, a Tak 135 f2.5, and a 50 f2, and they have all been a great help in understanding the relationship between aperture and shutter speed. For 20 years I had a Pentax film camera and used 'Program' mode all the time. Now, wit...
Posted by sam-joseph on 02/09/2011 - 11:56
Vivitar 19mm F3.8 Prime lens
I had one, bought for doing virtual panoramas for a client's web site, to use on 35mm. It was a little disappointing for the reasons DaveHolmes points out - not terribly sharp especially in the corners and colour a bit odd but served its purpose. Never used it on digital since the 18-55 is way be...
Posted by gartmore on 02/09/2011 - 12:22
Focal Length for indoors
Since the only fast wide primes have poor edges (e.g. all the Sigmas) they are not suitable for group portraits. Also thin depth of field does not work since someone will be out of focus. I would never think of anything less than f/2.8; in fact f/4 to f/8 is much safer. So a zoom that is sharp at f/...
Posted by rparmar on 03/09/2011 - 23:49
Focal Length for indoors
A fast prime (Sigma 30mm / Pentax 35mm) will be great for individual 'portraits' or shots where only one person is in focus (e.g. a person talking while others listen) but I agree with Robin, for wide angle group shots indoors you need something a bit wider and reasonable DOF which will need flash (...
Posted by Pentaxophile on 04/09/2011 - 01:21
10 stop ND filter
If this is to show movement such as flowing water, have you tried multiple-exposure? (Does the K-x have it?) I did this a while back because I only had six stops but needed 10+ for the effect I wanted. It probably isn't exactly the same but it blends real well to give a smooth silky look. It ce...
Posted by amoringello on 05/09/2011 - 00:47
Zoom Lens- Close Focus Distance
Does the close focus distance quoted in the specification for a zoom lens apply across it's zoom range or only at the short end. I'm thinking in particular about the Pentax 17-70 f4 which states focus range is "0.28m to infinity"
Posted by bforbes on 05/09/2011 - 09:36
Zoom Lens- Close Focus Distance
For some lens, like the Tamron and Sigma 70-300, you can focus to the minimum distance only at the long end of the zoom. For other, it will work for any focal length.
Posted by pentaxian450 on 05/09/2011 - 11:38
Zoom Lens- Close Focus Distance
This is slightly convoluted thinking and may display a misunderstanding of DOF, but... Surely on a variable aperture zoom the minimum distance will be shorter at whichever end has the slower maximum aperture? On the basis that DOF extends in front of the subject as well as behind, anyway? I'd...
Posted by Dangermouse on 05/09/2011 - 12:07
Zoom Lens- Close Focus Distance
For some lens, like the Tamron and Sigma 70-300, you can focus to the minimum distance only at the long end of the zoom. For other, it will work for any focal length. Are you thinking of lenses with a Macro capability? or does that apply to none macro as well
Posted by bforbes on 05/09/2011 - 13:07
Zoom Lens- Close Focus Distance
Why do you ask?..... Are you using it in a confined space?..... Don't forget that the focal length changes as you focus closer :shock: Edit: You already have a 17-70mm... can't you just measure it?
Posted by Algernon on 05/09/2011 - 13:35
Zoom Lens- Close Focus Distance
For some lens, like the Tamron and Sigma 70-300, you can focus to the minimum distance only at the long end of the zoom. For other, it will work for any focal length. Are you thinking of lenses with a Macro capability? or does that apply to none macro as well Those two have Macro. With all the l...
Posted by Anvh on 05/09/2011 - 13:36
Zoom Lens- Close Focus Distance
This is slightly convoluted thinking and may display a misunderstanding of DOF, but... Surely on a variable aperture zoom the minimum distance will be shorter at whichever end has the slower maximum aperture? On the basis that DOF extends in front of the subject as well as behind, anyway? I'd...
Posted by bforbes on 05/09/2011 - 14:00
Zoom Lens- Close Focus Distance
Probably better with MF at close distance.
Posted by Algernon on 05/09/2011 - 14:16
Zoom Lens- Close Focus Distance
The dof is wider at 17mm then at 70mm and the 17-70 is known not to lock on so well at 70mm if i'm correct.
Posted by Anvh on 05/09/2011 - 14:17
