Large APS-C (23.7 x 15.5 mm) sensor Large sensor in Nikon D100 ensures a good low light image quality compared to smaller sensor, and it also provide shallow depth of field and a nice blurry background when needed.
Large Body Even the smallest lens attached to this body will be a burden to carry everywhere with you.
780g Carrying this weight all day may not be very comfortable for you.
Body Thickness 81mm With a thickness of 81mm,Nikon D100 is not a pocketable camera for sure.