The F36 is a logical extension of the motor drive system pioneered by Nikon's S2 Rangefinder, whose motor was designated S36. Considering that the F shared many features with the SP, including the slip-off back, the F36 may be called an S36 in reflex guise. It is less advanced than many of today's winders, requiring careful attention to the shutter speeds in use as well as modifications to the camera body before being mounted. It does not offer power rewind, but did have the frame "countdown" counter found on all of Nikon's professional motordrives through the F3.
The motor itself adds about 27mm (1.1 in) of height and 275g (10oz.) of weight to a standard F body. Most F36's came from the factory matched and synchronised to a specific body. If you want to motorise your F, you will need to obtain a replacement plate (also known as the "F Motor Drive Plate") which you swap with the standard plate on the bottom of your F (with the back removed). This plate has extra holes and levers to synchronise film transport operations with the motor. You may then need a camera shop's help to ensure that the F36 is synchronised completely. The difficulty of finding shops to help you with this today makes the F a very difficult camera to motorise, and unless you require the historical accuracy, it is much easier (and cheaper, as F36's in working order are expensive!) to get a motorised F2 or F3.
This motor completely replaces your standard Nikon F's back, and includes a pressure plate and a key on the bottom to lock/unlock the back to the camera, just as with the standard back. On the front of the motor is the coaxial power connector; the back holds three dials: from right to left, they are the "countdown" selector, S/L/C collar and firing button, and firing rate knob. Nikon recommends that you use their reloadable film cartridges with the F36 for slightly higher performance (no felt light traps, so less friction == faster, longer battery life), but the convenience of using preloaded film probably outweighs any marginal improvements you may realise.
When the motor is mounted to the body, you may still use manual film advance and release, as long as the motor's "countdown" window does not read "0". This "countdown" selector is most useful for bursts of specific numbers of frames (set the number by pressing in on the selector and turning it clockwise), or for automatically stopping the motor at the end of a roll (again, set the appropriate number of frames). Unfortunately, the F36 does not integrate the "Orange Dot" position of the MD-1/2 and MD-4, which allows an indefinite number of pictures to be taken.
The S/L/C (standing for Single, Lock, and Continuous) collar surrounds the motorised shutter release button. Turn the collar so that the dot appears next to the appropriate setting, and press the release button to take a picture and wind the camera on to the next frame. You will want to be sure to hold the button down long enough for the shutter to completely cycle, or else the mirror will remain locked up from the previous exposure. Any speed (except "T") may be used in single-shot mode, although it might be more convenient to leave the motor in continuous mode -- it is quite easy to remove your finger in time to avoid taking two shots in a row, plus you have the option of sequence photography, if you so desire. While the thought of blasting film through your camera may be impressive and certainly will make you sound like a pro, I find motor drive most useful for keeping the camera pressed firmly to my cheek, without taking it away to wind on the film (I am left-eyed, so the lever inevitably pokes me in the right eye). I also find it useful for power-rewind when it is cold out, and I have gloves on and do not wish to unfurl the tiny rewind knob that Nikon gives to us. As the S/C selector on the Cordless Pack overrides the one on the back, Nikon recommends that you leave the S/L/C collar in "L" when using the Cordless Pack. The S/L/C collar on the Cord Pack also overrides the back-selected position, so again, put the back at "L" when using the firing button on the Cord Pack.
The firing rate control is fairly self-explanatory. Because the F has a mechanical shutter and does not communicate well with the motor drive, you need such a device to set the delay between firing the shutter and winding the film on (otherwise I suspect that you could probably do violent harm to the shutter-timing gears). The F3 has an infinitely more logical system -- you set the shutter speed, don't worry about when the film will wind on, as the camera and motor will chatter away happily to each other about this. On the other hand, you can't set the MD-4 to fire at a specific framing rate without purchasing the accessory MK-1. I find that the benefit afforded by knowing the framing rate is outweighed by the inconvenience of figuring out the appropriate shutter speeds to use.
The F36 probably has as many different undocumented models as the S36 does, since Nikon was constantly improving its products throughout their lifetimes. Some of the changes may have been cosmetic, but it is likely that there were some geartrain refinements sprinkled somewhere into the mix. And yes, there may be a F36/MD-1 prototype(s) floating around out there, perhaps with power rewind and various other features, including externally-mounted couplings, like on the F2. However, it's just a vicious rumour, at best, but given the presence of F2-based F3 prototypes, one can't help but think that the F must have served as a testbed for the F2.
Unlike the F36, the F250 does not have the keyed lock/unlock on its bottom plate. It actually attaches over the strap eyelets. The top of the F250 is dominated by two large, knurled knobs at either end; there is one slider just inboard of each knob, which goes over the strap eyelets. The very right edge (i.e. the take-up side) of the F250 also has a back-plate lock on it. To fit the F250 to the F, assuming camera and motor are synchronised:
Now you are ready to load the MZ-1 cassette with 33 feet (10m) of film. On the other hand, you can use your camera as a massive F36 -- you need to remove the camera (reverse steps 3-4 above and load the cassette [can't use Nikon's reloadable cassette] normally) and then fit the camera to the F250 again. For those of you with MZ-1's, this is how you load one:
Hey, we're not through the woods, yet. You still need to put the loaded cassette into the supply chamber, which requires a bit of care:
Now that all that's been done, you have to pull out some film (about 400mm or 16 in.) from the supply spool, cut the leader to shape, and thread it onto the take-up cassette as outlined above. Again, note that the emulsion side should be in. After sliding the take-up cassette back into the F250, as outlined above, take up any slack in the film with the supply-knob. Make sure that the sprocket teeth of the camera engage appropriate holes on the film. Whew! I'll tell you this much: I don't think that the whole business of bulk-loading film and fiddling with the MZ-1's has much changed, even today with the F5. Finally, replace the back plate and turn the two top knurled knobs to "close" (which locks the eyelet holders in place and somewhat perversely opens both MZ-1's.
You may confirm that the camera and motor are winding the film correctly by making sure that the supply knob is turning as you expose film. Because you lose so much film to being the leader, you need to make five complete "blank" exposures before getting to the unexposed portion of the film. Similarly, when taking the completed 10m roll out, you will need to make five "blank" exposures before removing the back.
Nikon made plenty of exciting accessories for the F250, but the one that you really need is the Cord Pack (or the MA-1) to supply power. It attaches just the same as to the F36, through the coaxial connector on the motor's front. Strangely enough, F250's are often cheaper than F36's, probably because of their limited usefulness to modern users (much easier to perform time-lapse photography with an integrated intervalometer, autoexposure, and autofocus -- ergo the F4/MF-24) and amazing bulkiness. On the other hand, you might be able to accomplish reportage more efficiently by not having to stop and reload so often, although the F250 only holds the equivalent of seven rolls of regular film, and whatever you save in not reloading so often, you probably lose again in weight/bulk, handling, loss of portability, inefficient reloading, and unwieldy processing. So perhaps the F250 is best for the budding F collector who wants to obtain a reasonably rare item at a decent price.
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