Search results for 'back focus' - page 2203
Digital CCD, Bayer and sharpness
In response to a PM I received, here's some background information and bed-time reading for anyone who wants to know what goes on :) It is, in part, some of the information I used in developing my Just to start the subject, sharpness is dependent on a number of factors. We are talking sharpness...
Posted by MattMatic on 16/03/2007 - 09:47
On the rails..
Nice but could really do with a train or other action :D Perhaps you could go back when they are running
Posted by Rodger Fooks on 17/03/2007 - 11:15
On the rails..
I'm a bit late commenting on this. In my youth, I used to go rock-climbing in North Wales, and this pic really brings back memories of the gritty, grimy, grey, coal towns around the fringes of Snowdonia. Very evocative, and if you hadn't said Paignton, I would have assumed Blaenau Ffestiniog. ...
Posted by George Lazarette on 18/03/2007 - 13:10
Tamron 1.4X
I have just got a Tamron 1.4X converter, imported from the States, to match my Tamron lenses. It works fine with my Pentax lens and my Tamron 90mm, but I cannot get manual focus with either the 18-200mm or 28-300mm. Auto focus works fine although there is a definite click the first activatio...
Posted by old timer on 19/03/2007 - 12:11
Tamron 1.4X
Unfortunately all my Tamron gear is old adaptall 2 manual focus, so I can't really help but I do have Pentax AF lenses and the Pentax 1.7x AF converter. This is really designed for MF lenses and there is no drive connection for AF - so an AF lens works in MF only (the adapter does the focusing). I...
Posted by Kimbo on 19/03/2007 - 18:23
Tamron 1.4X
Cheers Kimbo. I'm quite intrigued by your description of the problem - are you sure that the lenses auto-focus when attached to the adapter? Yes, but I must check ther FLs of the lenses to see if that is relevant http://www.tamron.com/lenses/prod/teles.asp This just gives me the prices and ...
Posted by old timer on 19/03/2007 - 19:17
Tamron 1.4X
I have now tried all my lenses systematically and the results are below There does not seem to be any way to format this data so the first yes/no on each line refers to Manual focus and the Second yes/no refers to Auto focus. So they all work fine on Auto Focus, but the two Tamron zooms do not...
Posted by old timer on 20/03/2007 - 10:52
Tamron 1.4X
Got an email from Tamron the other day: quote:- "I'm not saying it is a problem. Try to look at it this way - if your have a gear train of lets say 6 gears and there is a certain amount of force needed to rotate it, then you add another 4 gears, it will be harder to rotate the gear train...
Posted by old timer on 01/04/2007 - 15:30
Tamron 1.4X
That seems like a very strange response to me, almost like they're just trying to fob you off! Did they actually confirm whether or not the lenses were all suitable for that particular converter and if there were any limitations? There is obviously some gearing involved but I think he was just...
Posted by Kimbo on 01/04/2007 - 22:22
Tamron 1.4X
That seems like a very strange response to me, almost like they're just trying to fob you off! I rather got that impression. Did they actually confirm whether or not the lenses were all suitable for that particular converter and if there were any limitations? Nope. What you have is virtually the...
Posted by old timer on 02/04/2007 - 14:01
Test on dust removal systems.
I don't see it as a design fault. All SLR's I have owned ended up with dust/dirt on the focussing screen, on the side you can't access. It is allmost impossible to design it in a way that dust can't get in. The whole concept of removable focussing screens causes small gaps which will let dust throu...
Posted by SPB on 28/03/2007 - 20:32
Test on dust removal systems.
Perhaps you have dust inside the pentamirror... The K10D (*ist-D, *ist-Ds) have pentaprisms which you can't get dust inside. I've had no issues with these three - each of them also has a removable focus screen. Matt
Posted by MattMatic on 31/03/2007 - 07:40
Monitor Calibration & Profiling for DUMMIES
:roll: Right folks here I go...I know the forum had discussed this subject in great depth already but I am afraid to admit an awful lot of it is way over my head! So, I hope you dont mind me trying to put forward a few questions I would like to address for the benefit of myself and for the possib...
Posted by Lilly on 22/03/2007 - 16:23
Monitor Calibration & Profiling for DUMMIES
We have three computers here and all three show the same colour, not 100% exactly but very closely and with enough certainty to be able to process images on any of them. We make small mental adjustments depending upon which monitor is in use. Your picture looks incredibly green to us. I've never,...
Posted by johnriley on 25/03/2007 - 12:27
Monitor Calibration & Profiling for DUMMIES
another thing, whenever you update the driver for your graphics card you should update your profile, the profile supplied by the monitor manufacturer is only part of the story. With a profiling device display2, spyder, huey, etc. will check the entire chain from graphics card to monitor. For ATI ...
Posted by golfdiesel on 25/03/2007 - 15:24
Monitor Calibration & Profiling for DUMMIES
OK John, I have got a pair of post boxes here, sorry to go on about this but I DO appreciate feed back re: my problem from the top of the page, as I have now come to realise it will be a total waste of time setting up my website and trying to print images without there being any corellation between ...
Posted by Lilly on 26/03/2007 - 18:33
Want to get your own back
Seeing as were in a bit of a critique mode on the forum, here's another couple of images for your observations ..........
Posted by McBrian on 27/03/2007 - 22:12
Want to get your own back
Hi Brian, the sunset one's a cracker, lovely rich colours and a simple silhouette to show them off.. and I'll look at cats all day. :) If I had to find something to critique.. and I struggled, :wink: it would be to close down the lens a stop for the cat. The right eye is going out of f...
Posted by LiamD on 28/03/2007 - 06:53
Mono shots from Cornwall
I have been experimenting with mono conversion with guidance from Joshua as posted a while ago. I am trying to convey the mystical atmosphere of this celtic land and would appreciate any constructive comments if you feel so inclined. Does the exposure look spot on to you? This is of a railway...
Posted by Lilly on 29/03/2007 - 17:49
Photography is Fun
So here's today's Fun Picture. We're just back from the new doctor Who exhibition in Manchester, so here is my picture of ADAPS' favourite model Maxine, as Rose Tyler...
Posted by johnriley on 31/03/2007 - 15:37
