Search results for 'back focus' - page 1272
Reciprocity Failure ?
Hi Kim, A quick browse through the web seems to suggest that RF doesn't apply to digital, but long exposures do increase noise, which you obviously don't get with film. The D seems to handle this okay though, when noise reduction is switched off. I did some 1 minute exposures a while back, as...
Posted by Daniel Bridge on 02/12/2006 - 23:22
Reciprocity Failure ?
That's why in high end imaging applications such as photospectrometers which use CCD's the CCD's are often cooled by a peltier element and in more exotic systems even with liquid nitrogen. Heat can do strange things to all electronic components. I have read somewhere that someone used a cooling...
Posted by golfdiesel on 03/12/2006 - 12:29
K10D - I got mine!
The last one of the ducks I adjusted slightly with levels in PS... but just a tad. The rest are o'natural. I noticed a bit of CA in the tail area of the foreground duck and down the back of the rightmost one. Try PTLens to correct. Otherwise fantastic shots, I hope to get my K10D next weeken...
Posted by Mannesty on 11/12/2006 - 09:45
K10D - I got mine!
Thanks Kim for that concise explanation of the difference between colour fringing and CA. I have been searching for that information for some time and have obviously been looking in the wrong places . Good to have you back after your long hiatus. 8) Drew
Posted by photo*ist on 17/12/2006 - 18:39
DON'T BUY PENTAX DIGITAL LENSES!!!
As I think I said in another thread, neither I nor many amateurs need to produce prints larger than A3 and for that even a 6 MP APS-C sensor is easily sufficient. The size/weight thing also becomes important these days. If you want to attract new people into SLR photography, you have to remember t...
Posted by Ammonyte on 12/12/2006 - 10:14
DON'T BUY PENTAX DIGITAL LENSES!!!
I can't help but agree with everything said so far but I don't discount the possibility of anything. Just look at how prices for technology have tumbled, who would have thought just a few years ago that computers with flat-screen monitors, multi-core processors, gigabytes of dual channel memory and ...
Posted by Kimbo on 12/12/2006 - 14:35
DON'T BUY PENTAX DIGITAL LENSES!!!
the Pentax DA lenses are actually more compatible with film bodys than just about anyone elses similar lenses. Mount your 18-55 or 16-45 on a Z or MZ series film camera and you have aperture control from the body and a very fine lens provided you don't go wider than about 24mm. Try that with a C...
Posted by Mongoose on 12/12/2006 - 17:44
DON'T BUY PENTAX DIGITAL LENSES!!!
For the friend who located the DA 200 on his LX camera I would like to ask if he used slide film or a negative one. If he used the negative one did he look at the negative strip to look for vigneting because the shop that printed his photos maybe cropped the images and as a result the black circle ...
Posted by Mongoose on 07/05/2008 - 14:44
DON'T BUY PENTAX DIGITAL LENSES!!!
Yes, my Super A is a good size and weight, jut don't like the positioning of the controls as they are difficult to get to. Imagine a Super A with an ergonomic redesign and the sensor from the K20D. You don't need a large screen on the back either,just enough for the histogram and to get the compo...
Posted by Tyr on 09/05/2008 - 19:35
DON'T BUY PENTAX DIGITAL LENSES!!!
DON'T BUY PENTAX DIGITAL LENSES. The reason is that these lenses can't be used on analog bodies and on future full-frame sensor digital bodies. The great advantage of Pentax was the compatibility among their products. Where is it now? And not only this. Every TTL flash by Pentax doesn't cooperat...
Posted by Don on 11/09/2008 - 23:37
DON'T BUY PENTAX DIGITAL LENSES!!!
Wayyyy back in the eighties, A classroom full of students stared at thier apple 11's in bewilderment when instead of thier homework, "Don is Great" danced merrily across thier screens in beautiful full color (green)! Of course several minutes into my first of ten days (after school) detention, I ...
Posted by Don on 12/09/2008 - 00:25
DON'T BUY PENTAX DIGITAL LENSES!!!
Maybe I go back a bit further than some of you. Have a look at babies. My first introduction to . . . computers? The earliest (SADIE) was programmed using a number 60 drill and tinned copper pins passed through the hole, soldered both sides. It's memory . . . was a 1024 bit delay line. Sorry,...
Posted by Mannesty on 12/09/2008 - 23:09
DON'T BUY PENTAX DIGITAL LENSES!!!
[quote:5263f01789="teogin"] Pentax is NOT gonna change PRO photographers over to their line in any mass numbers. If you want FF CCD then why dont you "invest" in Canon technology? I dont get it, why try and force a huge company like Pentax to cater to your preferences? They have other consumer...
Posted by Mike-P on 20/07/2016 - 19:57
DON'T BUY PENTAX DIGITAL LENSES!!!
DON'T BUY PENTAX DIGITAL LENSES. The reason is that these lenses can't be used on analog bodies and on future full-frame sensor digital bodies. The great advantage of Pentax was the compatibility among their products. Where is it now? And not only this. Every TTL flash by Pentax doesn't cooperat...
Posted by D0n on 21/07/2016 - 00:07
DON'T BUY PENTAX DIGITAL LENSES!!!
[quote:3496ace15f="teogin"][quote:3496ace15f="Joshua Hakin"][quote:5263f01789="teogin"] Your prophecy came true ... the only trouble is very few of the people that disagreed with you still visit the forum. Shame considering you came back so many years later to gloat :lol: Dear Mike, I am not a p...
Posted by teogin on 21/07/2016 - 00:11
DON'T BUY PENTAX DIGITAL LENSES!!!
He did, very quickly, and snapped up a K1 ! It's amazing having a peek back in time, to a very different perspective on things in the Pentax world. It's clear that we are in a very different, far more encouraging and positive place now than then. The tone of the 'wishlists' is quite changed overa...
Posted by McGregNi on 21/07/2016 - 19:07
Why I do not like non full frame DSLR's...a personal view..
..or in other words, why I would only buy and use a full frame DSLR. Much talk here and other places about the various merits and de-merits of APS and FF sensor cameras. Most of the talk is about pixels, RAW, Jpeg and other technical points largely to do with image quality. Also much talk about t...
Posted by bretbysteve on 12/12/2006 - 14:53
Why I do not like non full frame DSLR's...a personal view..
Hi G, The relevance of my point 2 is that with an APS camera, I have little or no choice of manual focus ultra wide primes, but with full frame, I have plenty of choice... cheers Steve.
Posted by bretbysteve on 12/12/2006 - 15:41
Why I do not like non full frame DSLR's...a personal view..
I just HAVE to respond to this! ".........Your choice of only MF primes tells me you have plenty of time to compose your shots... so pets are out of the question!......" I know it comes as a nasty surprise but there was great action photography of very fast subjects before 'progress'...
Posted by viewfinder on 14/12/2006 - 09:55
Why I do not like non full frame DSLR's...a personal view..
In favour of smaller sensors Depth of Field! as a photographer who does primarily outdoor landscape and macro that extra 'stop'or so of DOF given by the smaller sensor is invaluable. While a tripod is a great asset for being able to steady camera shake it is not so much help if the subject is mov...
Posted by amilner on 14/12/2006 - 11:55
