Lens choice advice please for travel, wildlife, nature, and general photography

[cbloom]

Question about lens for travel/wildlife/nature and general photography:

Recently purchased an R10 with the RF-S18-45mm kit lens and trying to figure out the best route to go.

RF-S 18-45mm F4.5-6.3 IS STM & RF-S55-210mm F5-7.1 IS STM & RF 100-400mm F5.6-8 IS USM

OR

RF-S18-150mm F3.5-6.3 IS STM & RF 100-400mm F5.6-8 IS USM

The 18-150mm & 100-400mm would cost $167.12 more total.

Also, RF 100-400mm F5.6-8 IS USM x 1.6 (APS-C) would be 160-640mm F8.96-12.8, is this correct?

[ebiggs1]

"RF-S18-150mm F3.5-6.3 IS STM & RF 100-400mm F5.6-8 IS USM"

That combo form yout prefered list.

[p4pictures]

I would also select the RF-S 18-150mm lens and the RF 100-400mm lens for your EOS R10. 

firstly I have the RF-S 18-150mm lens on my EOS R10 and I love it. It is physically longer than the RF-S 18-45mmm but overall it so small and compact that I think it's a perfect walk around lens.

Your EOS R10 camera is a crop sensor camera, meaning it has an APS-C size sensor. This means that it only "sees" the central part of the lens, so it's like taking a 1.6x crop from a full-frame image. This 1.6x factor can be applied to all lenses fitted to the camera to see how their angle of view changes. For example the RF-S 18-150mm has the field of view of a 28.8 to 240mm lens on a full-frame camera. However the crop factor does not affect the aperture of the lens. So this means the angle of view of the RF 100-400mm is similar to a 160 to 640mm lens on a full-frame camera, but you keep the aperture F5.6-8.

So with the two lens kit you reduce the need to switch lenses, and have a setup that covers from 18 to 400mm in actual focal length, but has the angle of view of a 28.8mm to 640mm setup on a full-frame camera.

You might be able to trade your exiting RF-S 18-45mm lens when making the deal for two lenses with a bricks and mortar store.