Search results for 'back focus' - page 1144
New lenses How Exciting!!!
Nearly all the lenses released Most 400mm lenses are only 400mm at infinity. http://ricehigh.blogspot.com/2013/01/new-ricohs-aps-c-lens-patents-23mm-f25.html -- ------------------------------- I'm being a bit lazy but could you remind me of the theory behind this. Does this also imply tha...
Posted by dcweather on 19/09/2014 - 01:02
New lenses How Exciting!!!
It's all to do with the focal length changing as it's focused closer. IF lenses focus by changing the focal length. This article should cover it..... http://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/144003-lens-focal-length-rip-off.html --
Posted by Algernon on 19/09/2014 - 09:12
New lenses How Exciting!!!
It's all to do with the focal length changing as it's focused closer. IF lenses focus by changing the focal length. This article should cover it..... http://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/144003-lens-focal-length-rip-off.html -- Thanks.
Posted by dcweather on 22/09/2014 - 10:32
Pentax 50 - 135/2.8 vs Tamron 70 - 200/2.8 vs Sigma 70 - 200/2.8
It's not bad in the sun at all. I'm always shooting into the sun and it's fine. Of course it can flare, but not worse than anything else in my experience. It is slow to focus, but it doesn't loose focus and hunt laboriously like the 300 does. I wouldn't want to chase something random like a child o...
Posted by Darkmunk on 17/09/2014 - 09:00
Pentax 50 - 135/2.8 vs Tamron 70 - 200/2.8 vs Sigma 70 - 200/2.8
Has to be done I'm afraid John, the kids simply screen dump them for use on Facebook, at least this way I do get a couple of sales and if they do put them on FB with the watermark I'm getting the credit :) Hear you there Steve! I lose more images than I sell! I actually had a guy email me to ask if ...
Posted by jules on 17/09/2014 - 09:20
Pentax 50 - 135/2.8 vs Tamron 70 - 200/2.8 vs Sigma 70 - 200/2.8
[quote:3496ace15f="percy"]I have the 50-135, and until recently had a Sigma 70-200. The Sigma was a great lens for sports with quick and accurate autofocus and was pretty sharp. But for portrait work I would use the 50-135. That is also a pretty sharp lens - slightly more so than the Sigma - and the...
Posted by carmagw on 17/09/2014 - 14:08
Looking for lens suggestions Pentax K10D
Hi, I recently bought a Pentax K10D and although it's now an older camera I am very pleased with it. I am in possession of a very old 500mmm lens (2nd hand for £25 in 1989) this is okay-ish for aircraft photos but obviously has really severe limitations not least the darkness of the lens and manu...
Posted by chrisbates on 16/09/2014 - 13:18
Looking for lens suggestions Pentax K10D
I'm guessing the 500mm you have is a mirror lens which is probably the cheapest way of getting to that length. The next step (which will give you decent IQ) would be something like one of the large Sigmas such as the 150-500mm OS which will set you back around £400+ for a good used one.
Posted by Mike-P on 16/09/2014 - 13:58
Looking for lens suggestions Pentax K10D
I'm guessing the 500mm you have is a mirror lens which is probably the cheapest way of getting to that length. The next step (which will give you decent IQ) would be something like one of the large Sigmas such as the 150-500mm OS which will set you back around £400+ for a good used one. Many thanks ...
Posted by chrisbates on 16/09/2014 - 14:35
Looking for lens suggestions Pentax K10D
Actually.......no. I had a look at it (Behind the mirror?) it looked shiny in a 'do not touch me or you'll seriously regret it' sort of way. It actually looked very clean so I put the lens back on, let go of the button and went to find my bulb puffer, which has vanished. Any advice further to puffin...
Posted by chrisbates on 16/09/2014 - 18:43
Samyang 14mm or Tamron 14mm
So which would you choose and why? the Samyang 14mm 2.8 or the Tamron 14mm 2.8AF? I can buy either and the price is almost identical. The Tamron has a 5 year guarantee, auto focus, and a case. The Samyang a 3 year guarantee and MF. Main use would be for night skies.
Posted by Gwyn on 20/09/2014 - 11:47
Samyang 14mm or Tamron 14mm
Well for overall IQ the Samyang is rated better than manufacturers options that cost nearly 3 times the price. You've probably seen many of the pics before, but check out my gallery on here for loads of examples. Autofocus is not a priority really at this focal length I would suggest. I don't know a...
Posted by McGregNi on 20/09/2014 - 12:37
Lens hood for SMC 28mm f3.5
A cheap rubber one from eBay works well - it not only shades the lens but also protects it effectively, and no need to remove it - just fold it back over the lens when not in use: e.g. Cheers. Philip
Posted by MrB on 27/09/2014 - 13:08
using a tele converter
I have a K3 and use a Sigma 70-200 lens and have purchased a Sigma APO tele converter 2 x DG AF but when I attach it to the camera and then attach the lens when I turn the camera on the Auto focus just flashes on the Info screen and ~I can't change anything on the menu? should I be adjusting som...
Posted by marmimag on 02/10/2014 - 14:52
Lens Types
You can use pretty much any Pentax lens, all the bayonet ones certainly and even the screw thread ones dating back to the 50s and 60s, with a simple adapter.
Posted by johnriley on 06/10/2014 - 08:35
16-45 to 16-50
The 16-45 is a very capable lens, and on may shots there will be very little difference between it and the 16-50, but that extra stop and range, the weather resistance and SDM focusing all add up to a big improvement (for me anyway). I don't have anything to back it up but I felt that the wide end w...
Posted by LennyBloke on 07/10/2014 - 07:58
16-45 to 16-50
The DA16-45 is an excellent all-rounder. Personally I don't the bokeh that much, but otherwise is a very good lens. The DA*16-50 is a different beast altogether. It's substantially heavier, has a lovely bokeh, and a very nice rendering. It does suffer from quite a bit of purple fringing - it's ne...
Posted by MattMatic on 07/10/2014 - 08:49
Sigma 300mm F4 APO - sensible teleconverter?
Hi all I've got a Sigma 300mm f/4 APO that I use on both a K30 and K5, but I've never got my Pentax 2XS teleconverter to play ball with it - the aperture coupling never works as it should. I've seen a Sigma EX 2X teleconverter for sale for a decent price which I'm tempted to try, however I tho...
Posted by mattie on 09/10/2014 - 18:08
Pentax European Warranty - Length
I think my DA*300mm may have a focus tracking issue and I would like to get it checked out. I have a couple of questions:- 1. It was purchased from Amazon and is just under 2 years old. The warranty says it is for 1 year but I vaguely remember reading it had been extended to 2 years - is that the ...
Posted by dcweather on 13/10/2014 - 14:39
Pentax European Warranty - Length
What's 'a focus tracking issue'? The 300* is a slow-focusing lens and combined with a K5 (at least), is very prone to laborious hunting, even pre-focused on a bird in a featureless blue sky! But that is a camera issue surely.
Posted by Darkmunk on 13/10/2014 - 15:44
