Nikon D610 rangefinder This tube will give you

This tube will give you an additional 82mm- a substantial amount when combined with the RB's already impressive built-in bellows extension

but if you're in the market for a wide angle lens and you'd like a prefer bit of variety

but if you are going to use it for the sun stuff

camera strap

It's found on most of Sony's DSLRs and some of their earlier mirrorless cameras- but none of the current ones

Nikon D610 rangefinder This tube will give youThe Nikon D610 is a full frame DSLR with a 24mp sensor and compatibility with nearly any Nikon F mount lens, from AI forward that's a solid 40 years of lenses to choose from. The D610 also has dual SD card slots, full HD 1080P video at up to 30fps, and a 39 point autofocus system. In excellent cosmetic condition, with only very light wear, approximately 20k actuations. Includes battery, charger, strap, and instructions.