I'm looking for my next prime lens for my Canon 80D. I already own the 50mm 1.8 STM. Do you recommend a 28mm, 35mm, or 40mm? I do mostly nature/landscape photography and I'm looking to spend under $300. When I can expand my budget I will go for an 85mm, but for now I'm looking for a wider angle than 50mm. What are some of your favorites and why? Thanks!
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I don't understand why you want a prime. Landscape does not need a large aperture, right?. For the framing a zoom is nice. I would recommend 17-55 f/2.8 (not for the aperture, but for its sharpness stopped down) as it fits nicely with your telezoom. The 15-85 f/3.5-f/5.6 might be even a better choice. I own this lens along with 55-250 is stm, and the images of the 15-85 are much better, so you will have higher IQ in the range till 85mm.
Still want a prime?
35mm is usm is just the best lens, and it fits kind of in the middle of your zoom gap..... but it is expensive.
24mm is usm is maybe nice for lenscape, but..... i don't like this lens as much as my 35mm. Something with sharpness?, contrast?, i don't know. The pictures of the 35mm do look better. (I don't know the 28mm).
I like often the ef-s 24mm stm even more than the 24mm is usm. Do stop down to at least f/4.0 for good results (get rid of the vignetting). It is NOT expensive!...... but maybe to wide as you have a wide zoom already.
So...........
15-85mm f/3.5-5.6 is usm is the best choice i think.....
.......and if you really want a prime the 35mm. But you should choose the zoom.
Of course whe all have our budget limitations, but it is also a matter of time and patience sometimes.