p.54 #1 · Official: Sony A7 and A7R Fullframe Mirrorless
michaelwatkins wrote:
The NPFW50 is a single cell pack. 3.7V nominal * 1.080 Ah = 3.996 Watt hours of power. In contrast 3 good quality NiMh AA cells in series = 3.6V * 2.0 Ah = 7.2 Watt hours of power... but 3 AA cells take up more room than 1 smallish Li-ion cell as Li-ion wins on energy density.
Take a typical DSLR pack like the 1900 mAh ENEL15 for D800; these are two cell packs, wired in series =
7.2V nominal * 1.9Ah = 13.68 Watt hours of power. Some of that power will be given up as voltage regulator losses but there are sufficient other benefits in putting two cells in series to warrant taking on efficiency losses. ...Show more →
Michael, the NP-FW50 isn't 3.7V but 7.2V. The nominal capacity is 7.7Wh. - a tad more than 3 AA 2.0 Ah Nimh cells. A single NP-FW50 weights considerably less than 3 AA cells but is somehow bigger in total volume, although the AAs, being separate cylindrical units, surely would take more space in the battery compartment than one square Li-ion pack.
p.54 #4 · Official: Sony A7 and A7R Fullframe Mirrorless
joakim wrote:
I picked up my M and EF mount adapters and an extra battery today so now I have the adapters, battery and lenses but no camera. This is a first for me
Congrats!
I hope to be served by the first shipment in Europe on November 20.
p.54 #5 · Official: Sony A7 and A7R Fullframe Mirrorless
DamonJoyce wrote:
Actually, could be useful for astrophotography/timelapse work where you don't want to take the camera off the tripod.
Not unless they changed something from the NEX cameras.
When I plug my NEX-6 into my Anker external battery, it tries to connect to USB host, and you can't shoot with it.
p.54 #6 · Official: Sony A7 and A7R Fullframe Mirrorless
artur5 wrote:
Michael, the NP-FW50 isn't 3.7V but 7.2V. The nominal capacity is 7.7Wh. - a tad more than 3 AA 2.0 Ah Nimh cells. A single NP-FW50 weights considerably less than 3 AA cells but is somehow bigger in total volume, although the AAs, being separate cylindrical units, surely would take more space in the battery compartment than one square Li-ion pack.
Artur - Mea culpa! I should have looked at one. Picking it up it felt so light and small I just assumed it was a single cell / 3.7V nominal; I was having a hard time believing it myself actually. Thanks for the correction.
