Search results for 'sensor cleaning' - page 450
Lens calibration - Focus Tune software
This all makes me think the the sooner all DSLR's go mirrorless, the better. Surely the inaccuracy of the actual point of focus is down to the mechanical tolerances of the mirror adjustment and placement of the focus sensors. So with no mirror and the focusing being done by the image sensor sh...
Posted by Smeggypants on 28/04/2013 - 20:56
Lens calibration - Focus Tune software
I don't understand the issue. The only variable can be the camera body (lens mount, AF sensor & focus screen alignments). The AF system from the SFX onwards (maybe the MEF for all I know) is supposed to continually feedback to get the least phase difference between the two 'halves' of the sensor (i....
Posted by johnha on 29/04/2013 - 00:09
Lens calibration - Focus Tune software
JAK, what would you think if Pentax adjusted their cameras and lenses by using a hand held test? I'm afraid you have to be precise if you are making measurements. Your adjustment is nowhere near precise. I only mention it because you are making changes based on some very error prone methodology. ...
Posted by Smeggypants on 29/04/2013 - 01:31
Lens calibration - Focus Tune software
"I don't think teh increments can represent anything other than teh amount of micrometers the AF sensor moves by. Each lesne, focal distance, etc, will be different to how much this applies to a certain distance out of focus anyway" hang on a mo, let's think about this... AF sensor can't move,...
Posted by dpm on 29/04/2013 - 07:48
Lens calibration - Focus Tune software
" AF sensor can't move, can it? Image sensor can't move fore/aft either. AF mirror- and therefore path length0 *could* move if the main mirror is stopped by a servo rather than a hard stop. Dunno if this is the case. My understanding is the the micro adjustment does indeed move the sensor back an...
Posted by McBrian on 29/04/2013 - 10:07
Lens calibration - Focus Tune software
My understanding is the the micro adjustment does indeed move the sensor back and forth relative to the lens mount flange on a per lens basis (or global) depending on your choice from the lens adjustment menu. Your understanding is wrong.
Posted by kh1234567890 on 29/04/2013 - 10:51
Lens calibration - Focus Tune software
The AF sensor is bolted to the base of the camera body. Nothing short of baseplate removal and mechanical adjustment is going to move it...
Posted by dpm on 29/04/2013 - 11:46
Lens calibration - Focus Tune software
The AF sensor is bolted to the base of the camera body. Nothing short of baseplate removal and mechanical adjustment is going to move it... Nope, the sensor plate (oscillator plate) is not bolted to anything, it is held in position between the the front plate (permanent magnets) and the back plate b...
Posted by McBrian on 29/04/2013 - 12:59
Lens calibration - Focus Tune software
The AF sensor is bolted to the base of the camera body. Nothing short of baseplate removal and mechanical adjustment is going to move it... Nope, the sensor plate (oscillator plate) is not bolted to anything, it is held in position between the the front plate (permanent magnets) and the back plate b...
Posted by dpm on 29/04/2013 - 16:07
Lens calibration - Focus Tune software
" AF sensor can't move, can it? Image sensor can't move fore/aft either. AF mirror- and therefore path length0 *could* move if the main mirror is stopped by a servo rather than a hard stop. Dunno if this is the case. My understanding is the the micro adjustment does indeed move the sensor back an...
Posted by Smeggypants on 29/04/2013 - 17:03
Lens calibration - Focus Tune software
The AF adjustment is nothing to do with the Image sensor The AF sensor is mechanically adjustable via a screw(s) under the baseplate. however I think, and I'm not 100% sure on this, that the AF parameter in the custom menu doesn't physically move the AF sensor but rather applies a relative adjust...
Posted by McBrian on 30/04/2013 - 11:52
Exif Data Codes
Having now gone through all the pictures I took yesterday with SR turned on, all those of static or (relatively) slow moving subjects had SR stabilised. Without exception, every shot of fast moving and closer subjects (probably between 50 & 100) were not stabilised. So it seems as though SR wi...
Posted by percy on 05/05/2013 - 14:02
Image misaligned in viewfinder - K30
The viewfinder image is an optical one, so not connected with electronics, but....just maybe something like SR moving the sensor, or sensor correction of the horizon line, etc. may have been in play. The e-dial issue is something else, but if it's cleared then just keep an eye on it and if necess...
Posted by johnriley on 07/05/2013 - 16:43
Image misaligned in viewfinder - K30
Does the K-30 have a 'sensor shift' facility like the K-5? Might it be related to that?
Posted by percy on 07/05/2013 - 17:24
Image misaligned in viewfinder - K30
Thanks for the replies guys. It does indeed have the ability to shift the sensor, though it only allows it in live view, and I was using the viewfinder. However, the shift that it provides is around the same amount that the photos were out by, and that in itself is interesting. I'm wondering if ...
Posted by ventmore on 07/05/2013 - 20:07
Image misaligned in viewfinder - K30
Sorry John, the email link took me to the newest post, and I missed your post first time :) Although the image in the viewfinder is optical, I wondered if there was a possibility the mirror wasn't returning to the correct position. I do have 30 days to return, and I've already made the shop aw...
Posted by ventmore on 07/05/2013 - 20:19
K30 jpg very poor
I risk reigniting various ongoing 'RAW vs JPG' debates here but I think it is important - the idea that JPEGS from the camera somehow represent 'no processing' is misleading. In reality, what they represent is in fact a great deal of processing, including WB, hue / saturation, colour vibrancy and to...
Posted by McGregNi on 13/05/2013 - 11:50
K30 jpg very poor
I have heard these favorable comparisons to the earlier models quite a lot on this forum - I can't comment because I'm fairly new to Pentax (K7 is my first DSLR). But what I would like to find out is what is it that is actually producing these 'better colours'. If you are telling us that you see...
Posted by McGregNi on 14/05/2013 - 14:13
K30 jpg very poor
Change the sensor, you change the processing too to some extent, but you have an upgraded "film" in your DSLR. The overall effect is subtly different possibly between CCD and CMOS cameras. Not better, not worse, just different. I think it is very subtle though and I'm only partially convinced.
Posted by johnriley on 14/05/2013 - 14:25
K30 jpg very poor
Personally I think the CCD sensor of the K10D has far better colour fidelity than later CMOS censors, I still use the K10D on occasion for Macro shots of flora and fauna for that reason, fitted with a Tamron 90mm Di one of my favourite lenses. John
Posted by johnwhit on 14/05/2013 - 14:31
