Is it worth buying an EF to R adapter for the 40mm 2.8?

[eppsa]

I currently have a 70D with the 18-135 EF-S kit lens and a 40 2.8 pancake lens. I’m upgrading to an R8 and I’m not sure if it’s worth getting the adapter. I’m not going to get much for the 40mm if I try to sell it. I’m not planning on buying any more EF lenses. I would keep the 40 if it was a 1.8 but at 2.8 would you keep it and get the adapter just for that lens?

[shadowsports]

Greetings ,

Many of us have been in this same situation and although it's a hard pill to swallow, I would let the lens go.  

On your 70D, the FOV equivalent is 64 mm, somewhat awkward.

If you don't see yourself buying more EF lenses, there is no reason to buy the adapter.  I'd use the proceeds from your 70D, 18-135 and 40 mm to outfit your R8 with an RF equivalent zoom that includes 40mm.  

[zakslm]

eppsa,

I have a EF-S28mm f2.8 STM (about a 44.8mm full frame equivalent) that I use on a 90D and I use that lens as a "walking around" lens for street photos, impromptu portraits, individual and group shots and even some close up shots.  I really like the lens.  I'm guessing an EF 40mm f2.8 on a full frame camera would be produce similar fine results with an EF to R adapter.

You did not say which R lens or lenses you are getting with the R8, and if a 40mm focal length with an f2.8 aperture would be covered by an the R lenses you plan to acquire.  Although the choice is yours, unless your planned acquisition of an R lens or lenses more or less renders the 40mm redundant (like maybe a R50mm f1.8 STM?) I'd keep the EF 40mm and get an EF to R adapter. There are so many really nice EF lenses available used and reconditioned and even if you don't plan on buying one now, you may change your mind in the future and getting an adapter now may be a sort of insurance policy that provides that flexibility.

Good luck!

LZ

[p4pictures]

I have the EF 40mm f/2.8 STM lens and use it on the lens adapter with various R-series cameras both full-frame and crop models. If you can work out why you chose the 40mm f/2.8 in the first place, then maybe that guides your choice for the new camera. 

As pointed out below the 40mm on an APS-S camera has the field of view of a 64mm lens, so you could possibly swap the EF 40mm f/2.8 to the inexpensive RF 50mm F1.8 for a slightly wider view. The RF 50mm F1.8 on its own is smaller than the EF 40mm on the lens adapter. 

If you chose the 40mm for it's f/2.8 aperture and low light shooting then the RF lineup has a few choices worth looking at; RF 35mm F1.8, RF 50mm F1.8 and RF 85mm F2, plus the new RF 45mm F1.2 lens. 

You might just choose to pick up the RF 28-70mm F2.8 lens and use only that with maybe a longer lens like RF 100-40mm later if you need it.

RF35mm F1.8 Macro IS STM 

RF50mm F1.8 STM 

RF85mm F2 Macro US STM 

RF28-70mm F2.8 IS STM