Search results for 'sensor cleaning' - page 426
Testing for sharpness and that sort of thing
Pentax ( and most other DSLRs I believe ) cameras have the AF sensor in the bottom of the camera. The centre of the mirror is half silvered and there's a secondary mirror behind the main mirror which directs some of the light down to the AF sensor. For this it doesn't matter where the focus screen ...
Posted by Smeggypants on 06/07/2012 - 02:13
Pentax K-3
This months Digital SLR Photography Magazine mentions that 'Pentax is rumoured to be preparing to launch the K-3, a flagship model that boasts a 24.7 mega pixel full-frame sensor by Sony' iI have not been on the forum for a while. Has there been much talk of this?
Posted by bluenose82 on 05/07/2012 - 22:18
Pentax K-3
The USA based Pentax Forum faked up such a camera, as stated, for April 1st as part of the campaign to get a 35mm film equivalent sized sensor in a Pentax. IF it is the mentioned Sony, I understand Pentax have to wait six months after Sony to use it themselves for licencing reasons. Presumably it...
Posted by wvbarnes on 05/07/2012 - 23:15
Pentax K-3
The square format has been asked for many times since the 1960s onwards, and we did have it in the form of Rollei and Zeiss 126 format SLRs. It made them look very boxy though and didn't catch on. Don't forget you would end up with a square the size of the shortest side of the APS-C format, not the ...
Posted by Blythman on 06/07/2012 - 09:48
Pentax K-3
APSC lenses might vignette - the square would need to be about halfway between the longest and shortest side of the current sensor to fit within the APSC lens image circle (although the image circle of many DA does actually seem to be larger than the sensor actually requires - in fact some actually ...
Posted by Pentaxophile on 06/07/2012 - 10:18
Pentax K-3
I would welcome a compact FF camera from Pentax, as opposed to the big bruising brutes that are the 5D and D700/D800. It could be a great USP for Pentax IF it could be done. (electronic motherboard, battery and indeed the sensor itself do take a lot more space than a mere roll of film) Plus, as Nik...
Posted by Offertonhatter on 06/07/2012 - 20:23
Pentax K-3
I don't particularly want a square photo all the time, it's just it would save turning the camera around for Landscape and Portraits. If people want full frame then it could be based on that and the sensor would be a little bigger than the short side of an APS-C even if it was the short side of a fu...
Posted by vic cross on 06/07/2012 - 20:40
Pentax K-3
So the K-3 would be a crop sensor camera using the same sensor as the Nikon 3200 and the Sony A77
Posted by leytono on 07/07/2012 - 21:36
Pentax K-3
I don't particularly want a square photo all the time, it's just it would save turning the camera around for Landscape and Portraits. If people want full frame then it could be based on that and the sensor would be a little bigger than the short side of an APS-C even if it was the short side of a fu...
Posted by Smeggypants on 07/07/2012 - 23:22
Pentax K-3
Have a sensor that is square, but the size of the longest side of the current sensor. APS-C lenses would fit and not vignette. APS-C lenses would almost certainly vignette with this setup. Don't forget that the area covered by a lens is generally circular, the 'image circle'. A square or rectangular...
Posted by MarkTaylor on 08/07/2012 - 11:53
Pentax K-3
On reflection, I see that vignetting/non vignetting is not so clear cut. If DA lenses just have enough coverage for the current APS_C sensor, then yes vignetting will occur. However there is a massive difference in the circle which covers APS-C and the circle which covers full frame. The DA lenses t...
Posted by Blythman on 09/07/2012 - 07:41
K30 Review - AF a smidge worse than Canon 5d II
They are saying that if you use the centre point only and then move the camera, say, downwards to recompose, the distance from the point the eye registers on the sensor to has changed, slightly altering the focus point. I'm not totally convinced that at normal distances and apertures this makes v...
Posted by johnriley on 10/07/2012 - 13:58
K30 Review - AF a smidge worse than Canon 5d II
They are saying that if you use the centre point only and then move the camera, say, downwards to recompose, the distance from the point the eye registers on the sensor to has changed, slightly altering the focus point. I'm not totally convinced that at normal distances and apertures this makes v...
Posted by JohnX on 10/07/2012 - 15:39
K30 Review - AF a smidge worse than Canon 5d II
They are saying that if you use the centre point only and then move the camera, say, downwards to recompose, the distance from the point the eye registers on the sensor to has changed, slightly altering the focus point. I'm not totally convinced that at normal distances and apertures this makes v...
Posted by johnriley on 10/07/2012 - 16:02
K30 Review - AF a smidge worse than Canon 5d II
[quote:3496ace15f="johnriley"]They are saying that if you use the centre point only and then move the camera, say, downwards to recompose, the distance from the point the eye registers on the sensor to has changed, slightly altering the focus point. I'm not totally convinced that at normal distan...
Posted by JohnX on 10/07/2012 - 16:50
sensor smudge on k-x
Got a bit of a problem. All my images (taken with a k-x) have a sensor smudge in the same place (tried changing lenses, and used dust removal facility). It tends only to be noticeable against a v uniform background, such as the sky. Examples plus crops below. It is about 1/5 way down the frame a...
Posted by jamiegoode on 11/07/2012 - 17:02
sensor smudge on k-x
Try the sensor dust removal several times. Then a rocket blower. If still no success, then a cleaning kit may be needed. Others will follow with their recommendations. I've never had to use a cleaning kit, so can't help with that bit.
Posted by johnriley on 11/07/2012 - 17:30
sensor smudge on k-x
...any use to you?
Posted by steven9761 on 11/07/2012 - 17:41
sensor smudge on k-x
thanks both, useful info. Is there anything to be wary of when approaching the sensor?
Posted by jamiegoode on 11/07/2012 - 17:58
sensor smudge on k-x
Not really, be sensible and patient, i.e don't attack it with a screwdriver wrapped in a cloth :D, use proper fluid and brush and if necessary repeat the cleaning operation. Do make sure the batteries fully charged otherwise the mirror may come down during the operation should the battery die on...
Posted by Chrism8 on 11/07/2012 - 18:06
