Search results for 'back focus' - page 1682
Internal battery
It may not be a battery, it could be just a capacitor. Many compact cameras loose their settings if left with a run down or no battery. Anyone experienced that with a Pentax DSLR? I'm sure there is a thread here where someone was saying their camera would not remember its settings when it was turned...
Posted by JAK on 09/05/2012 - 23:00
Internal battery
In my K-3 in some of the customer settings it seems to have managed to save f/4 as the aperture value so any time I use that and switch the camera off and on again it goes back to f/4. I don't think it should do that but certainly if you're using something other than a custom setting you've saved i...
Posted by Jonathan-Mac on 01/12/2024 - 10:19
Buying a spare battery
Hi,] Digi Quik have a K-7 battery for £9.99- (just noticed it's out of stock). But I'm wondering from people who have bought batteries from similar places (or Ebay) how they faired for you? they're a lot cheaper than £60+ but do they drain quicker, any noticable downsides to them? Can an...
Posted by dinneenp on 11/05/2012 - 14:38
Buying a spare battery
Hi,] Digi Quik have a K-7 battery for £9.99- (just noticed it's out of stock). But I'm wondering from people who have bought batteries from similar places (or Ebay) how they faired for you? they're a lot cheaper than £60+ but do they drain quicker, any noticable downsides to them? Can an...
Posted by K10D on 12/05/2012 - 11:03
Buying a spare battery
If your camera takes AA batteries via an adapter 'Bernado' alerted me to a low price one from China .. http://www.ebay.co.uk/itm/180663078079?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649 I got one of these (£3.80 delivered) and use it with Uniross Hybrio rechargeables which make this anoth...
Posted by InFESTation on 13/06/2012 - 22:56
Buying a spare battery
I have read and heard a lot of issues with batteries purchased on e-bay, which are in fact duds, or have caused damage to the camera in question. Sure, it might be very rare, but it is something that makes you think. Hence why I always purchase something like a battery from a reliable source. I br...
Posted by petrochemist on 14/06/2012 - 12:29
Buying a spare battery
[quote:3496ace15f="johnha"]Having read 80 odd posts in this topic, I'm a bit surprised an innocent looking question has generated such a lot of interest. Maybe it's because of all the .... My preference would be for a genuine battery simply because aside from the wrong flashgun, it's the most ...
Posted by Smeggypants on 15/06/2012 - 02:11
Lenses and focal leangth.
Lens FL's refer to infinity focus. They DO change at closer distances. Internal focus lenses can change by a massive amount. For lens testing I usually put two small (50mm long) pieces of electrical tape 500mm apart horizontally or two blobs of Blu-Tak and then move the camera backwards and forw...
Posted by Algernon on 13/05/2012 - 08:28
Lenses and focal leangth.
I forgot to mention: Focusing is a big problem on tests, the adjustment for MF is too coarse and the 3" LCD hasn't got enough resolution. The simplest way is to take at least 4 shots and pick the best using a viewer that allows 1:1 comparisons. A better way is to use a focusing rack, lock the ...
Posted by Algernon on 13/05/2012 - 09:55
Lenses and focal leangth.
Looking at the specs on Dimitrov for the 18-135mm It has a close focus of 400mm and a magnification at 135mm of 0.24x A normal 135mm macro would produce 1:1 (1x) at 4f =540mm so the 18-135mm isn't anything like 135mm at 400mm A quick calc shows it to be about 62mm FL at 400mm :shock:
Posted by Algernon on 13/05/2012 - 20:40
Lenses and focal leangth.
All IF lenses focus by changing the focal length.
Posted by Algernon on 15/05/2012 - 12:42
Lenses and focal leangth.
I had the same issue with the Sigma 18-200 when compaired to my DA*50-135 and raised a simular topic back in 2008 . There is a link to a Wikipedia article in that thread.
Posted by beakynet on 16/05/2012 - 10:43
Lenses and focal leangth.
I agree. We can spend hours discussing optics, focus breathing, equivalent AOV and a million other things that really don't matter. Or we can just use the lens to take a photograph!
Posted by greynolds999 on 16/05/2012 - 11:48
Lenses and focal leangth.
I agree. We can spend hours discussing optics, focus breathing, equivalent AOV and a million other things that really don't matter. ... to you.
Posted by ChrisA on 16/05/2012 - 12:26
Lenses and focal leangth.
Just suppose I have a 100mm non IF focus Macro lens, but I am too close to the bugs and frighten them off. Would spending a lot of money buying a 180mm/200mm IF Macro lens be of any help. What FL would the 180mm IF Macro be at 1:1? I also have a 50mm f/1.7 standard lens..... what length of tu...
Posted by Algernon on 16/05/2012 - 12:45
Lenses and focal leangth.
50mm is correct it's always f where f is the focal length. The distance object to focal plane/sensor is 4f at 1:1 With a 50mm lens all the elements move back and forth via the helicoid so it doesn't matter if its set to 0.45m or infinity on a bellows performance will remain the same.
Posted by Algernon on 16/05/2012 - 14:08
K7 to K5 - is there any point now?
I kept the K7 as back up when I bought the K5 .... and promptly sold it 3 months later and bought another K5 (night and day comes to mind). As far as price etc. is concerned. Photokina is Sept, IF they announce a replacement there then it will still be a few months to launch date ... and earlier ...
Posted by Frogfish on 13/05/2012 - 19:42
dust layer on mirror? Brand new K5
Thanks johnriley for the reply - it does have a gritty look. After putting up my original post I was so concerned I'd got a duff unit I telephoned Pentax and the guy spoke with said the viewing screen should have been absolutely clear. Its definitely not a clear screen. Back to the shop maybe :(
Posted by Spiritwalker on 14/05/2012 - 22:10
dust layer on mirror? Brand new K5
Thanks johnriley for the reply - it does have a gritty look. After putting up my original post I was so concerned I'd got a duff unit I telephoned Pentax and the guy spoke with said the viewing screen should have been absolutely clear. Its definitely not a clear screen. Back to the shop maybe :(...
Posted by ChrisA on 14/05/2012 - 22:47
K5 Firmware 1.13 upgrade issue
I have just upgraded my new k5 from v1.01 to v1.13 I had a major panic after following the instructions almost to the letter! Upgrade went ok after which I removed the SD card and turned the camera back on, nothing. panic. Clean trousers needed. I have just learnt that the camera will not sta...
Posted by Floggitt on 14/05/2012 - 22:21
