Search results for 'sensor cleaning' - page 163
AF problem on Pentax 18-135
hello, just to say i got the same problem on my 18-135 : between 18 and 24 the lense can't focus at a distance over 2 meters, under this distance, it works better, when the subject is in dark light, the autofocus works better !!! it seems that the IQ is very poor at this range did "digitalK...
Posted by JAK on 22/07/2017 - 11:49
sigma vs Tammy 70-300 vs Pentax da 50-300
he suggested using multi AF points if the sky was clear blue or white/grey but single point AF otherwise, this was great advice and worked well even with the 55-300 and K10D (if you think about it, it makes sense) . Think/personal experience with the GX10 (a K10D with a different "paint job"!) is ...
Posted by jeallen01 on 22/04/2015 - 11:41
testing the 16-50mm da star sdm lens
Mattox - LiveView will perform focus using contrast detection (like a compact camera). It's slow, but it is using the sensor information directly. The "normal" phase detect focus uses a separate sensor for AF. The focus adjustment helps to correct for any alignment issues between the AF sensor an...
Posted by MattMatic on 24/04/2015 - 16:04
What lenses for the new FF
I have plenty of full frame wide angle lenses, the K15, K17, M20, K24, K, M or A 28, K30, K35... It will be interesting to see how they fare at the edges though. The centre used by APS-C works fine to superb, but the angle of light into the photosites may be more of a problem around the edges. ...
Posted by bwlchmawr on 01/05/2015 - 17:30
What lenses for the new FF
I have plenty of full frame wide angle lenses, the K15, K17, M20, K24, K, M or A 28, K30, K35... It will be interesting to see how they fare at the edges though. The centre used by APS-C works fine to superb, but the angle of light into the photosites may be more of a problem around the edges. ...
Posted by womble on 01/05/2015 - 17:53
What lenses for the new FF
It's important to put things into perspective. The usual wide-angle on FF is 28mm (24mm at a push) - anything wider than this is exotic and expensive. DA lenses are (quite rightly) optimised for the APS-C sensor - some that were derived from FA lenses probably cover an FF frame OK (the 35/2.4 & 50/1...
Posted by johnha on 01/05/2015 - 20:21
What lenses for the new FF
Found this from Ricoh. http://www.ricoh-imaging.co.jp/japan/products/lens/images/K_Mount_Lens.pdf I really hope that these lenses work well on the ff. I am holding on to my old primes and some zooms in hope that the ff frame really evolves why we are Pentax. I have had soooo much bad luck with ...
Posted by mattox on 01/05/2015 - 20:30
What lenses for the new FF
The lens map shows a full frame 16-28mm fast zoom, that will be expensive though. As for older lenses particularly the old k and m lenses I feel the newer sensor will out resolve those lenses.
Posted by cabstar on 01/05/2015 - 21:13
What lenses for the new FF
The lens map shows a full frame 16-28mm fast zoom, that will be expensive though. As for older lenses particularly the old k and m lenses I feel the newer sensor will out resolve those lenses. Hi Gary, I'm sure the new sensor will probably out resolve some FA lenses - this isn't my concern - I'd be ...
Posted by johnha on 01/05/2015 - 21:32
What lenses for the new FF
Why would you spend all that money on an ff body and stick an old FA28-80 on it? The FA* yes but none * lenses I don't understand. Because it's not about ultimate IQ for me, it's the other benefits you get from a larger format - smoother tonal graduation, shallower DoF if you want it, and depending ...
Posted by johnha on 03/05/2015 - 12:15
Pentax HD D FA 150-450mm f/4.5-5.6 ED DC AW Lens - NOW IN STOCK!
If it looks that good on a cropped sensor; imagine full-frame in about six months
Posted by 50mpCMOS on 08/05/2015 - 00:45
Pentax HD D FA 150-450mm f/4.5-5.6 ED DC AW Lens - NOW IN STOCK!
If it looks that good on a cropped sensor; imagine full-frame in about six months Someone should try it on film in the meantime.
Posted by Jonathan-Mac on 08/05/2015 - 06:04
15mm f4 - soft copy?
They look good in my opinion. With regards to trees far away, I have a feeling your expectations are wrong. UWAs will not give you detail in subjects far away; the magnification is too small for that. You will be able to see the outlines, you will be able to recognize colors (and as a result perc...
Posted by sterretje on 13/05/2015 - 07:01
Pentax 150-450mm
I agree, I have the 300 star F4 and converter for my K3 and struggle to see what the bulk and price of the new lens delivers to us now. Presumably its all about the 35mm size sensor body coming in the autumn when it will show off the larger sensor advantage. Unfortunately Dave I don't have the 30...
Posted by wvbarnes on 06/06/2015 - 15:09
Pentax 150-450mm
There are now 3 reviews on the "other" site and they are amazing. Two 9's and a 10 and faster focusing than the DA* 300 and sharper with the TC (allegedly of course" Found this odd though:- "...keeper rate rate is much higher with this lens then with the da*300 (+tc) and it feels like you have a h...
Posted by dcweather on 10/06/2015 - 22:58
9 of 44
I reckon a sub 12mm star rectilinear prime for both APSC and 35mm size sensor would be interesting. The 12 to 24mm DA must be ready for a motorised upgrade too to suit both formats. At the telephoto end all too heavy and expensive for this amateur. I just hope fresh APSC and trade mark compact...
Posted by wvbarnes on 20/05/2015 - 18:03
9 of 44
I doubt that a crop in of 40mm would make much difference to IQ on a FF sensor. Surely on FF most of these very long telephoto images would be cropped a bit anyway, and without any significant loss of resolution ..... ? I'm not looking for that sort of focal length, but I would have thought the ...
Posted by McGregNi on 21/05/2015 - 11:09
Which Lens as Upgrade From Kit Lens
Try a Tamron 17-50. It has a constant aperture of 2.8, is compact and quite nicely built. Stopped down a bit, mine produces lovely images with consistent focusing, plenty of detail and good contrast, albeit on a K5 (which has a much better sensor, of course). It comes with a 5 year guarantee for pe...
Posted by bwlchmawr on 25/06/2015 - 21:03
My 150-450 DFA is a bit of a dud
Thanks Mike. I am going to give it one last chance with +10 this afternoon and if I still can't get anything approaching what was posted yesterday by truckerathome on the Your Photo section it will have to go back to SRS in the morning. I have managed to get the switch back together and operation...
Posted by malcolmk on 24/06/2015 - 11:41
My 150-450 DFA is a bit of a dud
it is not uncommon with some quality control issues at the launch of a new product. This applies to many brands and products. In the photography business the oil stains of the Nikon D600 sensor and the mirror box reflections of the Nikon D750 come to mind. There was further a problem with light leak...
Posted by bjolester on 27/06/2015 - 09:29
