K-m Burst Mode Problems...


PentaxBoy1

Link Posted 07/08/2009 - 10:10
Hi All,
I was at a birds of prey flying exhibition yesterday and encountered some problems with the K-m in high speed setting. I took five pictures in the burst with almost new lithium energizer AA's and the camera processed them and then said 'battery depleted' and shut down. As the batteries almost new I was very disappointed. I then started it up again and the battery meter showed full charge. Has anyone else come across this problem? I do lots of fast moving sport and maybe I need to upgrade already! I'm not sure these lithium AA's are up to the job.
Your thoughts apprecieted,
Phil

K-m/DAL 18-55/DA 55-200.

K10D

Link Posted 07/08/2009 - 10:30
The batteries are the issue. The Lithium AA's will not hold their voltage under high discharge current. If you look at flash recycle times for instance, they are often slower than Alkaline cells but actually have a higher capacity, hence more flashes per set. Their internal resistance is slightly higher, so the voltage drops more as the load increases.

Ni-MH would serve you better.

Regards

Lynton

Link Posted 11/08/2009 - 19:29
Not had a problem with my K-m (other than the ability to catch exactly what i wanted to!)

For info I use a set of Duracell rechargeables 2650mAh. About 10 from Currys

K10D mentions above why the problem occurred...... get the highest mAh rating you can to minimise the impact of this.

gill748

Link Posted 11/08/2009 - 20:47
i use the durecell 2650mah too and have had no problems
If at first you dont succeed click,click again

Paulm0bsw

Link Posted 15/08/2009 - 20:12
I use rechargebles Ni-MH , never had any probelms, it fires off like a good one.

scottthehat

Link Posted 15/08/2009 - 20:18
i recomend using uniross hybross or sanyo eneloops as they hold there charge for longer, I think they hold 80% if not used for a year.
just keep snapping,

http://www.pentaxphotogallery.com/scottbenson

http://s727.photobucket.com/albums/ww272/scottthehat/


CAMERAS = k200d + battery grip.
nikon d300 + battery grip.
LENSES = tamron aspherical DII 18-200mm f3.5/6.3,
nikon 18-200mm afs vr f3.5/5.6 g dx
sigma 150-500mm apo dg hsm os
sigma 170-500mm apo dg
FLASH = samsung sef36pzf flash + more.

PentaxBoy1

Link Posted 18/08/2009 - 20:49
Hi Guys,
Thanks for all your help.I was recommended the Jessops 2700mah Ni-Mh batteries. They are much better. I can burst on hi setting many times before they are showing reduced voltage. I also got myself a PK-A 50mm f1.7 for 40 with lens hood and filter. It's a great little lens, I'm loving it!
Phil.
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