I have an EOS 50E and FM2, both can be attached with a battery grip as AA batteries are easier and cheaper to buy, 50E use BP-50 and and FM2T use MD-12, but for FM2T, it can be operated without batteries and that's the reason I bought it.
The followings are extracted from MIR:
The MD-12 is powered by eight 1.5V penlight (AA size) batteries which are housed in the unit's battery chamber. To load or replace batteries, turn the coin slotted locking screw on the battery chamber lid counterclockwise. The lid will come loose and the battery clip, which forms a single unit with the lid, can be removed. Load the batteries, taking care that they are inserted correctly.
As a guide, however, you can expect to be able to expose more than a hundred 36-exposure rolls of film per set of alkaline-manganese batteries. Since batteries have poor low-temperature characteristics, battery performance diminishes considerably as the temperature decreases. This results in slower shooting speed and reduced film transport capacity. From the manual, Nikon stated that Alkaline manganese batteries, in particular, suffer severely at temperatures below 0 C. However, the MD-12 can use lithium batteries to extend its operational limit on such application or for normal use - but generally, normal Alkaline cells is good enough and it is much economical. With the battery properly install, you need to mount the drive on your camera. The MD-12 has been designed such that it can be attached or removed at any time regardless of whether or not the camera is loaded with film.
Before attaching the MD-12, make sure that its power switch is turned off. Then, position the motor drive on the camera's bottom plate, its hand grip should be at the same end of the camera as the film advance lever. Ensure that the raised ring around the drive shaft is correctly seated inside the locating collar, coaxial with the camera's film advance coupling. Then, fasten the motor drive's attachment screw, turning it clockwise by means of the thumb wheels on either side. Simultaneous use of both forefinger and thumb will speed up attachment. Make sure there is no gap between the motor drive and the camera body; then tighten the attachment screw firmly.
Make sure when you perform this task of mounting the drive to your camera body, the power switch on the back of your camera is turn off to avoid possible electrical surge on wrong contact with the electrical terminals. The drive will advance upon wrong contact and since it might move 'violently' when it has nothing to hold onto, such action may damage the pins and cause unnecessary replacement/repairing cost. Althoughthe MD-12 has a ground to protect, but it is still advisable to note this. I know it is very hard to press people to pay attention to these minor things, because it is not a very frequent process to change or re-mount a motor drive unit. It needs to experience once to remember for the rest of your life. I am more concern if such thing happens, you may get a shock and drop your camera ... just don't complaint that I have never reminded you of these.
The BP-50 is both a power pack and a vertical grip for the EOS-50/50E / Elan II/IIE/EOS-55QD. It uses four easily obtained size AA alkaline or rechargeable NiCd batteries, or a 2CR5 lithium battery The grip has its own shutter button with an On/Off switch.
The followings are extracted from MIR:
The MD-12 is powered by eight 1.5V penlight (AA size) batteries which are housed in the unit's battery chamber. To load or replace batteries, turn the coin slotted locking screw on the battery chamber lid counterclockwise. The lid will come loose and the battery clip, which forms a single unit with the lid, can be removed. Load the batteries, taking care that they are inserted correctly.
As a guide, however, you can expect to be able to expose more than a hundred 36-exposure rolls of film per set of alkaline-manganese batteries. Since batteries have poor low-temperature characteristics, battery performance diminishes considerably as the temperature decreases. This results in slower shooting speed and reduced film transport capacity. From the manual, Nikon stated that Alkaline manganese batteries, in particular, suffer severely at temperatures below 0 C. However, the MD-12 can use lithium batteries to extend its operational limit on such application or for normal use - but generally, normal Alkaline cells is good enough and it is much economical. With the battery properly install, you need to mount the drive on your camera. The MD-12 has been designed such that it can be attached or removed at any time regardless of whether or not the camera is loaded with film.
Before attaching the MD-12, make sure that its power switch is turned off. Then, position the motor drive on the camera's bottom plate, its hand grip should be at the same end of the camera as the film advance lever. Ensure that the raised ring around the drive shaft is correctly seated inside the locating collar, coaxial with the camera's film advance coupling. Then, fasten the motor drive's attachment screw, turning it clockwise by means of the thumb wheels on either side. Simultaneous use of both forefinger and thumb will speed up attachment. Make sure there is no gap between the motor drive and the camera body; then tighten the attachment screw firmly.
Make sure when you perform this task of mounting the drive to your camera body, the power switch on the back of your camera is turn off to avoid possible electrical surge on wrong contact with the electrical terminals. The drive will advance upon wrong contact and since it might move 'violently' when it has nothing to hold onto, such action may damage the pins and cause unnecessary replacement/repairing cost. Althoughthe MD-12 has a ground to protect, but it is still advisable to note this. I know it is very hard to press people to pay attention to these minor things, because it is not a very frequent process to change or re-mount a motor drive unit. It needs to experience once to remember for the rest of your life. I am more concern if such thing happens, you may get a shock and drop your camera ... just don't complaint that I have never reminded you of these.
The BP-50 is both a power pack and a vertical grip for the EOS-50/50E / Elan II/IIE/EOS-55QD. It uses four easily obtained size AA alkaline or rechargeable NiCd batteries, or a 2CR5 lithium battery The grip has its own shutter button with an On/Off switch.
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