Infrared film with the N90s and F100

[nikon geek]

I simply would like to know if infrared film can be shot in the N90s

and the F100 and what the names of the two different frame counters

are that affect the camera's ability to do so.

Thanks!

[mskovacs]

I call mine Bob and Doug. ;)

 

Seriously, the offending type are infrared LED counters. Basically they use IR light transmission (doesn't expose normal film) to count the sprocket holes and tell the motors how much to advance and when to stop. A mechanical advance (for lack of a better term) just "knows" how far to advance the film and doesn't expose film with light of any wavelength.

 

Sorry I don't have the first clue what kind of advance these cameras have so I can't help there. Often, even on cameras with this type of advance, the effect is limited only to the sprocket holes and doesn't show in the image frame.

[ilkka_nissila]

Neither camera use light to detect film advance so IR film can be used without problems.

[david_h._hartman]

Neither the F100 nor the N90(s)/F90(x) use IR but rather the customary gear driven sprocket wheel to control film advance.

 

---

 

My guess is that cameras that fog IR film use a diode that emits only IR (infrared light) then a sensor, an SPD that senses IR. SPD (silicone photo diodes) used in light meters have a blue filter (SBC, silicone blue cell) that cuts IR. An SPD without this filter should work. This IR system counts the sprocket holes needed to advance the film one frame. The use of IR with films that are not sensitive to IR posses no problems. The reason for using IR is to cut the cost of the camera both in parts and assembly.

 

Hope this helps,

 

Dave.

[photojim]

If the transport spool has teeth, it's a mechanical advance and is fine for IR film. If it doesn't, it's probably infrared and isn't fine. The F90x/N90s and F100 are fine with IR film. The F80 is not.

[spencer_hahn]

There are cameras with transport spools that lack teeth?

[photojim]

Some don't have teeth. The teeth are only needed to count frames. Infrared counters do that and obviate the need for teeth. The take-up spool has firm grip of the film in either case.