# Sentinel-2 MSI Level 2C B08_10m band amplitude compared to other 10m bands

I use Sentinel-2 MSI Level 2C product to compute NDVI at a 10m spatial resolution - using the the usual formula:
`NDVI = (B08 - B04)/(B08 + B04)`

but I notice that for the pasture fields that I am examining the mean `B08` pixel values are always 5 times greater than those of the `B04` band (or the other 10m resolution bands).
Is this typical for NDVI computations?

If not, do I need to scale the `B08` values down to compensate for the fact they are integrated over a much wider spectral bandwidth (140 nm) than the `B04` values
(38 nm)? - or is that already factored into the product?

I looked at the values of the narrowband `B8A_20m` band and since they are also about 5 times as big then I guess such values are typical and the NDVI is correct.