Search results for 'sensor cleaning' - page 155
Is this fungus?
Yes, I'll try cleaning it again. Now that I'm satisfied it's not fungus, I've finally mounted it on my K5 and taken a few test shots and so far I'm pleased with the results. Although I'm still a little worried about the long-term significance of the spot, I'm also quite reluctant to return the len...
Posted by asp09 on 13/11/2013 - 17:06
Pentax 16-50mm F2,8 DA* SDM
Good morning , Kind regards . Wim Sturkenboom Perhaps the lens may be defective, I do not say that the Tamron is a bad lens, but I think a better Pentax lens type sensor, a another brand, but I hope to come to prove it and show here in the gallery. Jon Schick goes to Faro, which refers to ...
Posted by NSANTOS on 17/11/2013 - 07:15
DXO Tests the Sigma 18-35mm
Ok in Nikon mount but it's supposed to be coming our way and I know there are a few people interested in it! Relevance: Tested on a 24Mp body, which is where we seem to be headed now, not the same sensor but it'll give the general idea... http://www.dxomark.com/Reviews/Sigma-18-35mm-F1.8-DC-HSM-...
Posted by jules on 22/11/2013 - 05:47
DXOMark scores
I can see a major flaw in those figures. They are tested in conjunction with different camera bodies and really they need to all be re-tested with the new K-3. My concern with current lens testing is that it tests the whole lens/sensor combination rather than just the lens. So as cameras improve the...
Posted by johnriley on 24/11/2013 - 15:39
Problem with this item teleconverter
I have cleaned the contacts and still nothing. The F on the LCD display on my camera just has - - next to it. I tried it with my 50mm FA 1.4 lens too with the same result. Not sure how to say this differently. Yes you are correct, the lens isn't getting an electrical connection through the ...
Posted by JAK on 12/12/2013 - 13:30
Focusing fast lenses wide open.
For testing it's worth trying out the Live View. That shows exactly what's hitting the sensor - so is helpful in checking what the lens can actually do ;) Once you have that referenced you can work from there... and possibly add in some focus adjustment to correct the phase detection autofocus an...
Posted by MattMatic on 12/12/2013 - 13:53
Macro on a budget?
Because the tube has no additional glass to interfere with the image that arrives at the sensor it will be sharper, and because it holds the lens further from the sensor it magnifies the subject hugely. with a Pentax A 50mm f1.7, however you have to get very close. To successfully shoot damsell...
Posted by SteveEveritt on 12/12/2013 - 17:29
Macro on a budget?
Or just holding (taping) a wide angle prime backwards on the end of another lens or tubes (bog roll) ;) Then clean your sensor...
Posted by Darkmunk on 12/12/2013 - 20:40
Showing my ignorance
The APS-C sensor of the K-5 crops a smaller rectangle (23.7x15.7mm) from the centre of the full frame rectangle (36x24mm), giving a similar view to a lens of about 1.5x the focal length, i.e. approx. a 36mm lens. Philip
Posted by MrB on 14/12/2013 - 12:49
Showing my ignorance
Put any 24mm lens on an APS-C Pentax then the 1.5x crop factor will make the field of view the equivalent of a 36mm lens on full frame. The lens doesn't actually change focal length because it has been put on a different camera body. A lens designed for an APS-C sensor may not cover the whole of a ...
Posted by JAK on 14/12/2013 - 13:50
Using UV Filters
Whilst I'm with John/Chris/Ken/Horst on this I think it's worth adding that there are some rare occations where a filter might be a good idea. If your likely to be getting salt/dirty water spray around (not so rare with WR cameras) add a filter (even a relatively cheap one) till clear of the spr...
Posted by petrochemist on 16/12/2013 - 12:51
Prime lenses for K-3
Unless you plan on mainly being a prime lens shooter, I think I`d suggest you upgrade your zooms first. You don`t say who made them but I`d be surprised if the 28-200 was much of a performer on the K-3 and the same may well be true of the 28-80. Neither give you wide angle on APSC. I`d suggest yo...
Posted by JonSchick on 21/12/2013 - 10:04
The Da 50mm f1.8
Hi Daz, Just got one of these and like you, did find the autofocus to be a bit stiff - the screw-drive motor has to work at it. I took the lens off the camera, gave it a bit of a work out by rotating the focus ring for a while, and then set it back on the camera. Seems happy enough now - as am ...
Posted by ronniemac on 09/01/2014 - 14:09
depth of field question
Hey guys, a question just popped up in my head. Probably a silly one but.. If i took a 50mm prime lens designed for cropped sensor and a 50mm prime lens for full frame. And then take the same picture at f1.8 using both lenses on a crop sensor dslr. Will i get roughly the same amount of depth of...
Posted by jkdlee on 07/01/2014 - 22:56
depth of field question
A 50mm 1.8 lens designed for full frame and a 50mm 1.8 lens designed for APS-C sensor would give exactly the same DOF if both are used on an APS-C camera.
Posted by pentaxian450 on 08/01/2014 - 00:10
Sell me something wide...
I clearly wasn't saying you can get an 8mm field of view with a 14mm ! :) It was a simple point about zoom vs prime pros & cons. I see many questions here about the various wide-angle zoom options for Pentax, and not so many about the primes - I just wanted to put the case for primes, and explain so...
Posted by McGregNi on 13/01/2014 - 19:56
get your Sigma 8-16 while you can.
It appears Sigma are selecting which lens is released with Pentax mount 18-200 yes 50 no Wonder if its relevant that the first one is DC (crop sensor) and the second DG (full frame)
Posted by Blythman on 15/01/2014 - 00:17
16mm???
I look forward to a K-02 ( as long as it isn't designed by the aesthetically demented Newson :D ) On the patents the sensor with (pentax) enlarged (pentax) green (pentax) pixels (pentax) by (pentax) Fuji (pentax) looked interesting
Posted by Smeggypants on 20/01/2014 - 23:54
the holy grail..
Does it weigh more than a Tonne? :shock: (Well every other daft question has been asked :lol: ) I was hoping that they'd bring out a 1.5x Back to Front Converter that left the lens as it was, but magnified the sensor so that it was FF :shock: :wink:
Posted by Algernon on 25/01/2014 - 11:13
DA 18-135 WR. Weatherproof, but will it keep dust out as well?
Hi, New here and I've got a question for a Pentaxian. I had a bad experience with a Sony A580/SAL 18-250 zoom lens. Problem with such a zoom is that it's a hoover, sucks every last bit of dust into the workings; onto the sensor and all over the inside of the lens. Nice camera good photos but h...
Posted by Ronthesnapper on 25/01/2014 - 19:45
