Search results for 'back focus' - page 1123
HD PENTAX DA AF 1.4X AW Rear Converter
I agree with Smeggy's observation on this one, it does look as though the DA*300 shot is a tiny bit back-focussed. Look on the right of the fairy bottle, at the marks on the plastic of the bottle. These are definitely sharper in the first image and if this was focussed 100% I think it would be at ...
Posted by davidstorm on 31/03/2014 - 22:38
HD PENTAX DA AF 1.4X AW Rear Converter
Interesting indeed Mike. To my eyes the shot with TC looks sharper than the DA*300 on its own - which I didn't expect. From these images the Sigma to me looks pretty much as sharp as the 300 despite what most folks say. that's how it looks to me. Back focussing a bit? The 300mm is set exactly the ...
Posted by Mike-P on 31/03/2014 - 22:54
HD PENTAX DA AF 1.4X AW Rear Converter
[quote:3496ace15f="gwing"]Interesting indeed Mike. To my eyes the shot with TC looks sharper than the DA*300 on its own - which I didn't expect. From these images the Sigma to me looks pretty much as sharp as the 300 despite what most folks say. that's how it looks to me. Back focussing a bit? The...
Posted by Smeggypants on 01/04/2014 - 00:58
HD PENTAX DA AF 1.4X AW Rear Converter
I think it's more likely that the camera was moving slightly as the shots were made. A back and forwards movement of only a tiny amount would be enough to change the point of focus after focus was locked. A tripod is really essential in any kind of lens test, even a simple one.
Posted by johnriley on 01/04/2014 - 07:22
HD PENTAX DA AF 1.4X AW Rear Converter
Incidentally, here's an example of using a cheap 2x convertor versus cropping a 300*. Mirror up, tripod, manual focus, live view x 2, no sharpening. 300 cropped to 800px 300 with 2x convertor, cropped to 800px This image sharpens-up really nicely with 50/1/0 USM
Posted by Darkmunk on 01/04/2014 - 11:39
HD PENTAX DA AF 1.4X AW Rear Converter
Incidentally, here's an example of using a cheap 2x convertor versus cropping a 300*. Mirror up, tripod, manual focus, live view x 2, no sharpening. 300 cropped to 800px 300 with 2x convertor, cropped to 800px This image sharpens-up really nicely with 50/1/0 USM There's a lot more differen...
Posted by Smeggypants on 01/04/2014 - 13:15
HD PENTAX DA AF 1.4X AW Rear Converter
Very nice Mike, all three. It ought to be the least standout shot of the three, but my eyes keep getting drawn back to the horse.
Posted by gwing on 08/04/2014 - 22:57
HD PENTAX DA AF 1.4X AW Rear Converter
Already returned mine, works fine on primes but not on zooms where it needs some nifty double pressing of the shutter button to get a two stage focus on zooms. Optically inseparable from Tamron but like all of them degrades the image and suffers CA too. Tamron is smaller but identical on perf...
Posted by Daronl on 08/04/2014 - 23:49
HD PENTAX DA AF 1.4X AW Rear Converter
Already returned mine, works fine on primes but not on zooms where it needs some nifty double pressing of the shutter button to get a two stage focus on zooms. Optically inseparable from Tamron but like all of them degrades the image and suffers CA too. Interesting comments. I've been watching w...
Posted by JohnX on 09/04/2014 - 08:11
HD PENTAX DA AF 1.4X AW Rear Converter
Already returned mine, works fine on primes but not on zooms where it needs some nifty double pressing of the shutter button to get a two stage focus on zooms. Optically inseparable from Tamron but like all of them degrades the image and suffers CA too. Tamron is smaller but identical on perf...
Posted by Mike-P on 09/04/2014 - 09:33
HD PENTAX DA AF 1.4X AW Rear Converter
Initial thoughts on the 1.4x converter On the DA*300 I have found that occasionally it won't trigger, The focus confirmation is there, but it seems it does not want to know that. I think I will give the contacts of the 300 a quick clean before I consider it a problem. Mind you, like I say, it is ...
Posted by Offertonhatter on 12/04/2014 - 21:10
HD PENTAX DA AF 1.4X AW Rear Converter
I'm thinking about this TC after having just bought a DA*300. However, after using the DA* for just a few days on the K-3, I'm wondering what gains the TC would bring? The sharpness and focus accuracy of the DA*300 on my K-3 is nothing short of staggering to me - I don't know if I've been lucky to...
Posted by davidstorm on 28/04/2014 - 19:53
HD PENTAX DA AF 1.4X AW Rear Converter
I suspect the benefit will come to wildlife photographers who need to heavily crop, at the point where the image without the TC would be close to getting pixellated, the TC image giving that bit more latitude. I think it will also be very useful for butterfly and dragonfly pics, to fill the frame a ...
Posted by davidstorm on 22/05/2014 - 22:06
HD PENTAX DA AF 1.4X AW Rear Converter
get an "empty" PZ 2x and AF should work fine. I've tried it. Good point, I've just bought one and may remove the glass as I think this may be more effective than using it with glass in. Even with a manual focus 2x 'sans glass' focussing is pretty easy in manual mode and the closer focussing with no...
Posted by davidstorm on 26/05/2014 - 00:20
HD PENTAX DA AF 1.4X AW Rear Converter
get an "empty" PZ 2x and AF should work fine. I've tried it. Just a quick update on this point, I have recently bought a Kenko 2x PZ-AF converter and found that it does not Autofocus with the Pentax SDM lenses, including the DA*300. This is nothing to do with aperture or loss of light as the camera...
Posted by LennyBloke on 04/06/2014 - 11:53
HD PENTAX DA AF 1.4X AW Rear Converter
If you search for threads about the Kenko Pz-af 1.5X Teleplus SHQ. It works to a degree with SDM/HSM lenses, but it does a lot of hunting. It's not hunting I was referring to Barrie, it's that the PZ-AF 2x TC will not even attempt to focus with Pentax SDM lenses. The cameras stay resolutely in Manu...
Posted by davidstorm on 04/06/2014 - 18:17
HD PENTAX DA AF 1.4X AW Rear Converter
I think that could be down to the fact that some converters were produced with the contacts in the bodies but no connection between front and back sets. As I understand it that's the difference in the SHQ and MC versions of the 1.5x.
Posted by bforbes on 04/06/2014 - 21:21
HD PENTAX DA AF 1.4X AW Rear Converter
Hi David - I was wrong about the 2X TC, so just to make things more confusing this is what I observed last night.... The Teleplus 2X PzAf MC7 does focus with screw drive lenses (no surprise) and attempts to focus with SDM lenses (DA*55) - but it does NOT focus at all with lens that have both syst...
Posted by LennyBloke on 05/06/2014 - 07:34
HD PENTAX DA AF 1.4X AW Rear Converter
Thanks for this information John, it does seem very strange that it will focus with SDM only lenses but not those which also have screwdrive! You would think it would be the other way round. Maybe someone with the appropriate technical knowledge can explain why this is the case. I do think the ...
Posted by davidstorm on 05/06/2014 - 09:04
17-70mm focusing issues
I have 17-70 f4 lens which is out of warranty but little used and am now having trouble with the lens unable to focus through the range especially in lower light levels. Its only been used on a k10d that has only done 2000 shots. Any suggestions that can help, contacts are all clean.
Posted by Roderick on 06/02/2014 - 16:28
