Search results for 'back focus' - page 1895
Why do we need more AF points?
First thing I do with a new camera is to change the AF points setting to central 9. i want to be in charge of focussing, not allow the camera to use a blunderbuss approach. Us the new camera with modern lenses and it will be lightening fast to achieve focus and track it. You have some quality ...
Posted by pschlute on 29/09/2019 - 20:38
Why do we need more AF points?
My take on this is I'm usually in single centre point single focus. As I understand it, people use the AF selection to achieve the same thing, but where the object of interest is not in the middle. I guess an example would be where you are tripod mounted, and the object you want to focus on is o...
Posted by richandfleur on 29/09/2019 - 21:41
Why do we need more AF points?
I've never had a problem with my K-3 clearing the buffer as long as I use it with a fast card. Regarding more AF points, I generally use central point, focus and re-compose. When on a tripod (usually taking family pics while on holiday) I do change the AF point to make sure it's on us, and here ...
Posted by Jonathan-Mac on 30/09/2019 - 09:07
Why do we need more AF points?
The K-1 buffer is abysmal, not quite so bad when using it in crop mode. The main problem with the Pentax AF points is that they are too large and so when you focus on a subject and there is something behind it the camera has a hard time deciding which it should be focusing on and so starts to hun...
Posted by Mike-P on 30/09/2019 - 13:00
Why do we need more AF points?
My Sony a7iii and Sony hdr-nx80 both share the most advanced af systems I’ve ever used. The wide area af with tones af points allow the cameras to track objects, pick out subjects and nail focus in situations where the k3 falls on its face. As a long time pro, who preferred manual focus and back b...
Posted by Don on 30/09/2019 - 14:57
Why do we need more AF points?
when you focus on a subject and there is something behind it the camera has a hard time deciding which it should be focusing on Ironically, this is where I have found my K-1 excels, using centre point focus only. A typical example would be a strand of tall grass in front of a background of distant ...
Posted by johnriley on 30/09/2019 - 15:03
Why do we need more AF points?
Ironically, this is where I have found my K-1 excels, using centre point focus only. A typical example would be a strand of tall grass in front of a background of distant trees. The K-1 nails it every time, whereas several mirrorless cameras have been flatly unable to focus at all. The same applies ...
Posted by Mike-P on 30/09/2019 - 15:51
Why do we need more AF points?
On the odd occasion I've found to use anything other than the center spot, by the time I've faffed about trying to get it to change or work or hit the right buttons, the action has long disappeared. I've got my action AF settings stored in a user mode. For what it's worth, AF.C and Expanded Area ...
Posted by richandfleur on 04/10/2019 - 01:48
Aww the K-5 ii.....
Hi Guys... I have not posted on here for a while. I have been enjoying other brands of camera which suit my style of photography much better i.e. touch focus...tilt LCD etc. However I still kept my 18-135 WR lens and a couple of other lenses and was recently reminiscing about one of my fav Pentax ...
Posted by Flyingmariner on 11/10/2019 - 11:54
Aww the K-5 ii.....
Welcome back, Pentax ergonomics strike back again...
Posted by johnha on 11/10/2019 - 12:58
Aww the K-5 ii.....
The sensor in the K-5 and K-5 II is better than the one in the K-3 in all aspects except resolution. I have the Fujifilm version in my X-M1 and it produces noticeably better IQ in low light than both my K-3 and the X-T20, which has the Fujifilm version of the K-3 sensor. By Fujifilm version I mean...
Posted by Jonathan-Mac on 30/12/2019 - 09:11
Focus shift - can live view focus stopped down?
I recently picked up a 18-270mm to update my ancient 18-250mm 'travel zoom' for my K-5 IIs. I realise it's not going to be up to the quality of a set of primes, but sometimes convenience is more important to me. One thing I notice, as I did with the 18-250mm, is how much the focus varies with ap...
Posted by WaypointCharlie on 24/10/2019 - 08:58
Focus shift - can live view focus stopped down?
Odd. There is a thing called focus shift which may explain this but it usually only applies to fast lenses 1.4 or so. The actual focus plane should remain the same whatever aperture you choose. Can you post some large scale examples
Posted by pschlute on 24/10/2019 - 15:06
Focus shift - can live view focus stopped down?
I've just dusted off my tatty old adjustment chart and took these two shots. Focal length 58mm. Distance about 60cm. I'm not sure how well the image will look at forum resolution. It's clear that f/8.0 is focussed in front of f/4.5, even though I didn't refocus betweeen shots. At this distanc...
Posted by WaypointCharlie on 24/10/2019 - 17:42
Focus shift - can live view focus stopped down?
You need to do about 10 shots at widest aperture to get an accurate representation. So camera on a tripod, remote or 2 sec delay. Natural light if possible. Make the camera focus each time from infinity alternating with closest focus distance. Then compare the results. This will tell you if your ...
Posted by pschlute on 24/10/2019 - 18:44
Focus shift - can live view focus stopped down?
There's no point in making micro AF adjustments. The problem is focus shift. I notice it with the lower grade Pentax zoom lenses. Is there no way of focusing stopped down using contrast detection? Yes, of course I used a tripod and 2 sec delay and natural light. I also tried acquiring focus ...
Posted by WaypointCharlie on 24/10/2019 - 19:52
Focus shift - can live view focus stopped down?
I can see what you mean Wayward but sadly have no solution. I used a newspaper with a black line on the margin to do a similar focus test. I soon realised that the focus of the zoom lens I was testing had a very variable bias back and forward of the focus point dependant on focal length and apertu...
Posted by Nigelk on 24/10/2019 - 20:22
Focus shift - can live view focus stopped down?
I don't suppose newer bodies would be different. I suspect they still acquire focus wide open and won't perform any tweaks for different focal lengths, apertures and focus distances. Fortunately in reality I rarely do much that's focus critical anyway, as I'm sure you'd agree! Nice try with the...
Posted by WaypointCharlie on 24/10/2019 - 20:34
Focus shift - can live view focus stopped down?
Interesting. Does the effect still occur at longer camera to subject distances and at different zoom settings ?
Posted by pschlute on 24/10/2019 - 22:28
Focus shift - can live view focus stopped down?
It gets weirder. I've just tried at 270mm and found that the camera focuses slightly differently as you stop down. This suggests the firmware attempts to compensate for the focus shift. I never realised the camera took account of the aperture when focusing. It's cleverer than I thought. Only p...
Posted by WaypointCharlie on 25/10/2019 - 11:50
