Wierd symptom with D100 and Neutral Density Filter indoors

Ill try to explain this best I can.

I use a 2stop ND filter with my D100 when I shoot outdoors, so I can

use fill flash. As we all know, the crappy flash sync with the D100

makes this necessary. This ND filter is supposed to do nothing but

affect the amount of light. That being said, using TTL metering with

a 80dx speedlight, it should meter and expose properly with it on or

off, and it does outdoors.

When I move indoors with the same setup, the camera under-exposes

the pictures MASSIVLY. 2 or 3 full stops. It almost acts like the

flash isn't powerful enough to overcome the ND at all, which seems

strange. Regardless, you would think the camera would compensate for

the apparent lack of light, and increase the shutter time. (i

normally shoot in A priority)

Am I doing something wrong? Or have I stumbled apon some type of

issue? The camera shoots just fine this way outdoors with greater

light. Thanks for any info you can provide.

The ND filter (my guess) is not engineered to 'white-balance' properly indoors, even with the use of a speedlight.

(...and remember, a speedlight is deigned for fill-flash out-of-doors, i.e., lighten the shadows, and is not, per se, a 'flash-bulb.' If you try to get 'flash-bulb' results, you need to go + compensation (large-spot meter) until you get enough light for your image.)

DIGITAL SLRs CAN'T DO TTL FLASH!!! Flash exposure calculation on a D100 is a combination of pre-flash metering and the readout from the sensor in the flash (like in "Auto" 30 years ago). Don't have a D100, so I can't give you a real advice, but you might have to play around with flash exposure compensation (or not use a ND indoors?).

Regards

Georg

<em>DIGITAL SLRs CAN'T DO TTL FLASH!!! Flash exposure calculation on a D100 is a

combination of pre-flash metering and the readout from the sensor in the flash </em>

<p>

This is not correct. The D100, as with all other Nikon DSLRS, perform TTL flash just fine.

TTL stands for Through the Lens metering, which the camera does do. The TTL sensor is

in the camera and it sees the pre-flash through the lens (hence, TTL). This is not to be

confused with Auto flash, which the flash also provides as an alternative.

<p>

The poster is probably referring to OTF (off the film) metering, which DSLRS don't do.

Plus he sounds little angry for some reason? oh well, I just brush those guys off.

Thanks for the replies guys. I understand that a ND indoors isn't needed, but as explained, one time I was shooting with one outdoors in bright sunlight, but then stepped indoors just to take a couple of play shots and realized that my camera wasn't reaching anywhere NEAR 18%, so I thought there was an issue; hence why I posted my question :)

Thanks again to the constructive contributers.