Dynax 7Xi - Does it see a black subject , grey %18 ?

[Mustafa Umut Sarac]

For example , We have Black Horse subject, Does Dynax 7Xi shoot it grey % 18 ?

 

[pentaxuser]

Yes, if the meter in the camera only covers the horse and does not take account of anything except the horse's black hide

All meters are designed to record about 18% grey

Was this not covered by the teacher in the class you attend ?

pentaxuser

 

[loccdor]

Yes. Only handheld meters in incident mode work differently.

 

[Mustafa Umut Sarac]

Yes. Only handheld meters in incident mode work differently.

incident meter , what is the other technology , can incident meter be made at home. My friend is working on a diy lightmeter , what is your advise to make it incident meter ?

 

[koraks]

what is your advise to make it incident meter ?

Don't. There are plenty of meters out there that work just fine. Making a meter involves the challenge of making it work well under various circumstances. Companies like Pentax, Seconic, etc. spent millions in R&D to figure out how to do this. Making a meter at home that's even close to the accuracy and dependability of the one inside your Dynax camera is virtually impossible.

The truth is that the meter in your camera is great; you just have to learn to use it.

 

[Paul Howell]

The 7XI has average, matrix and spot metering. In the average mode, if the horse takes up the majority of the frame then you will a gray horse. Average meters assume that any subject is comprised of shades from Zone IX to 1 and averages out all the tones to 18% gray or zone V. In spot mode, what ever you meter spot is seeing will be exposed at zone V. I think the 7X1 it is about 3%, In Matrix metering, maybe, maybe not. If all the cells are reading the same tone, then you will get zone V, but if you are back a bit with some backlit, maybe the chip understand that you have a black object and will compensate for Zone III to I. It is best guess by the chip. Best bet is to use a gray card or the plam of your hand as the referance for you horse shot. Of understand that you are reading in Zone V, underexpose by 2 stops to zone III, the core of the Zone System.

 

[Alan Townsend]

For example , We have Black Horse subject, Does Dynax 7Xi shoot it grey % 18 ?

You can buy lux meters online for about $10 that will work as incident meters. You need to convert lux to EI, then calculate exposure using tables. Phone apps are even cheaper.