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I am using a Neewer TT520 flash with a Nikon D7000. I am new to flash photography. When I mount it on camera I noticed that at times the flash didn't fire. I've spent some time researching it and discovered that the red light takes long to turn back on after every shot. This wasn't the case initially (about a month back). Is this issue related to the battery or has it something to do with the camera settings?

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2  
Almost certainly batteries. What happens if you replace them / recharge them? –  Philip Kendall Dec 19 '13 at 10:45
    
Thanks Philip. I did change them but I might have replaced them with used batteries by mistake. I will give it a try today again and revert.. –  Sankalp Dec 19 '13 at 10:52
    
How long does it normally take? –  Darkcat Studios Dec 19 '13 at 10:53
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oh! yes that is a long time... try brand new, good quality batteries - I tend to use NiMh rechargeables –  Darkcat Studios Dec 19 '13 at 11:11
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I have used sanyoo eneloop rechargable and am so far happy with the result on thouse –  Yao Bo Lu Dec 19 '13 at 11:24

3 Answers 3

up vote 6 down vote accepted

The recharge time is shorter if your batteries are fresh. It is also shorter if you use more expensive ones , like Duracell than cheap noname brands from discount stores, like "Ikea" and "Powercell". Actually, some devices refuse to run on cheap batteries.

To improve the charge time further, use 1900-2300mAh rechargables. They have higher peak amperes and last longer. I recharge once per month, while normal AA batteries go flat after one session. You can get some that keep charged when not used as well. Example figure from http://speedlights.net/wordpress/wp-content/uploads/2010/06/yn460-ii_recycle_times_full_power_in_seconds.jpg

http://speedlights.net/wordpress/wp-content/uploads/2010/06/yn460-ii_recycle_times_full_power_in_seconds.jpg

The fastest recharge I've ever done was when I rigged a flash to run off a car battery. It is not that portable, but for outdoor tripod work it is useful. You can also rig it to run from a PSU if you are near a powersocket.

You also gain recycle speed as you lower the power output, at a very good exchange rate. Two flashes of half power is the same light output but the recharge time for two half power flashes is faster than one full power. In my distant past testing, I lowered the recharge time to 25% as the power output was 50%.

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As per the suggestions, I replaced the batteries and it considerably improved the performance. I also noticed that light takes longer to come back on if I increase the light quantity Output.

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yes, when I rigged a Hensel Porty to trigger with external trigger the camera at a certain framerate, I could go 1 per 2 seconds at 100% power and 2fps already at half power. The xenon tube did blow up eventually at that frequent power output hahah. –  Michael Nielsen Dec 20 '13 at 17:17
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This looks more like a comment to the other answers than a freestanding answer. –  Michael Clark Dec 26 '13 at 20:36
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I do think this could be an answer by itself since it makes mention of what impacts the recharge time, however expanding it to indicate that having enough power available to rapidly charge and having less power needed to charge (using less power on each flash) is why those cause a difference. –  AJ Henderson Dec 26 '13 at 20:57
    
I agree with AJ, could be improved and kept as an answer. Sankalp, you can always answer your own question if you have an answer, that is an accepted paradigm here. –  jrista Dec 26 '13 at 23:32

Flashes are the biggest strain on batteries in photography, they use an awful lot of grunt. So I can pretty much guarantee your problem is flat batteries.

Manufacturers continue to use AA's because of their ubiquity; you can get them everywhere and pretty much any time even in remote locations. Because they're being pushed hard it does mean they will run down and go flat quickly.

You don't have to use rechargables but if you don't make the investment in a good charger and batteries you'll want to start buying good quality normal batteries in bulk/wholesale and don't bother with cheap ones, you'll end up with pockets full of 'dead' ones.

An additional factor in favour of NiMH rechargables (including the eneloop)is that they supply a good amount of power until they're practically exhausted which keeps recycle times good for a longer period. Normal lead-acid batteries ramp down their output more smoothly and the recycle time increases with each charge of the flash.

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