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**UncleVanya** · 08-30-2015, 12:10 PM

Has anyone here used the aftermarket JJC FB-4 external power pack for the AF540FGZ? Rather than 6 C cells it uses 8 AA cells.

transam879 · 08-30-2015, 12:53 PM

Originally posted by UncleVanya

Has anyone here used the aftermarket JJC FB-4 external power pack for the AF540FGZ? Rather than 6 C cells it uses 8 AA cells.

I have used it briefly before selling my 540 and switching to a Metz 58. If I recall correctly it worked well and is much less expensive than the Pentax one. Plus AAs are much more practical, as I have a bunch of rechargeable ones.

**UncleVanya** · 08-30-2015, 12:55 PM

I have also seen that the TR Power Pack 2 despite what Pentax claimed about physical incompatibility - produced the same voltage and used the same cord. I see these discounted all the time. It's bulkier being a C battery pack.

asp1880 · 08-31-2015, 01:37 AM - **1 Like**

I've also got the JJC power pack in question. It's great with the 540 and it really shortens the recycle times down to 1.5 seconds or so.

Two problems I can think of:

1. It's unhandy when mounted in the tripod socket under the camera.

2. It doesn't work with the 540's auto power off mode. I've found that when the 540 has gone into sleep mode with the
power pack connected and switched on, the flash won't fire when woken up again. The workaround is to disable
auto power off or to power cycle the flash and power pack. Perhaps it's a bug in the 540 and not in the JJC pack.
It's a thing to consider if the flash is mounted somewhere inaccessible.

Regards,
--Anders.

awaldram · 09-01-2015, 06:22 AM

Originally posted by UncleVanya

Has anyone here used the aftermarket JJC FB-4 external power pack for the AF540FGZ? Rather than 6 C cells it uses 8 AA cells.

look in the pentax's sorry flash thread I posted a video of it in use on the 540

**UncleVanya** · 09-01-2015, 06:28 AM

Originally posted by awaldram

look in the pentax's sorry flash thread I posted a video of it in use on the 540

After I posted this I realized which external supply you used, originally I had assumed your video was showing the use of the Pentax 6 C cell pack. Thanks for showing it.

08-30-2015, 12:10 PM	#1
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,464	JJC FB-4 power supply for AF540FGZ Has anyone here used the aftermarket JJC FB-4 external power pack for the AF540FGZ? Rather than 6 C cells it uses 8 AA cells.

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08-30-2015, 12:53 PM	#2
transam879 Veteran Member Join Date: Feb 2011 Location: Syracuse, NY Posts: 651	Originally posted by UncleVanya Has anyone here used the aftermarket JJC FB-4 external power pack for the AF540FGZ? Rather than 6 C cells it uses 8 AA cells. I have used it briefly before selling my 540 and switching to a Metz 58. If I recall correctly it worked well and is much less expensive than the Pentax one. Plus AAs are much more practical, as I have a bunch of rechargeable ones.

08-30-2015, 12:55 PM	#3
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,464 Original Poster	I have also seen that the TR Power Pack 2 despite what Pentax claimed about physical incompatibility - produced the same voltage and used the same cord. I see these discounted all the time. It's bulkier being a C battery pack.

08-31-2015, 01:37 AM - 1 Like	#4
asp1880 Veteran Member Join Date: Jul 2010 Location: Lyngby, Copenhagen Photos: Albums Posts: 742	I've also got the JJC power pack in question. It's great with the 540 and it really shortens the recycle times down to 1.5 seconds or so. Two problems I can think of: 1. It's unhandy when mounted in the tripod socket under the camera. 2. It doesn't work with the 540's auto power off mode. I've found that when the 540 has gone into sleep mode with the power pack connected and switched on, the flash won't fire when woken up again. The workaround is to disable auto power off or to power cycle the flash and power pack. Perhaps it's a bug in the 540 and not in the JJC pack. It's a thing to consider if the flash is mounted somewhere inaccessible. Regards, --Anders.

09-01-2015, 06:22 AM	#5
awaldram Veteran Member Join Date: May 2008 Location: Hampshire Photos: Gallery Posts: 732	Originally posted by UncleVanya Has anyone here used the aftermarket JJC FB-4 external power pack for the AF540FGZ? Rather than 6 C cells it uses 8 AA cells. look in the pentax's sorry flash thread I posted a video of it in use on the 540

09-01-2015, 06:28 AM	#6
UncleVanya Loyal Site Supporter Join Date: Jul 2014 Photos: Gallery \| Albums Posts: 28,464 Original Poster	Originally posted by awaldram look in the pentax's sorry flash thread I posted a video of it in use on the 540 After I posted this I realized which external supply you used, originally I had assumed your video was showing the use of the Pentax 6 C cell pack. Thanks for showing it.

JJC FB-4 power supply for AF540FGZ

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