RF 28-70 F2 IS STM f-stop range question

[Cantrell]

All,

Considering purchasing the above lens. Because there is not a range in F stops. The F2 is the F stop at 28mm as well as 70mm. Is that correct?

Thank you in advance for your response. 

[pcs1]

Correct, F-stop does not change while zooming, whether set at f/2 or f/22.

[shadowsports · Accepted solution]

Greetings.

This is a constant aperture lens. meaning it can be set at f2 (wide open) throughout the entire focal range.  It's a top performing lens but note it's big and heavy.  It takes a 95 mm lens filter and is 103 mm overall.  It weighs 3.15 lbs.  It's definitely on the chunky side 🙂.  

[Cantrell]

pcs1,

Thank you for your response. Happy Thanksgiving.

Reese

[Cantrell]

Rick,

Thank you for your response. Probably should have bought this lens instead of some others that I have purchased since buying the R6M2. Happy Thanksgiving.

Reese

[shadowsports]

When it comes to lenses, there's always one more.  😂

Happy holidays to you and your family also.

[ebiggs1]

"Probably should have bought this lens instead of some others ....."

No, not at all. He who has the most lenses wins! At least that's my motto. 😁 And I have a brilliant start. Seriously, I always try to find and buy zooms that are constant aperture. The only lens that I have, I use regularly, that is not a constant aperture is my beloved Sigma 150-600mm f/5-6.3 DG DN OS Sports Lens. All my Canon big three are constant aperture zooms.

[Cantrell]

Rick,

Thank you for your holiday wishes.I will tell my wife that you told me that it was okay to buy that lens. LOL!

Reese

[Cantrell]

ebiggs1,

Thank you for your comments about the lenses with constant aperture. I have been paying more attention to the F stop value of the lens. When I first started buying lens for the R6M2 I just looked at the range of the zoom, but after posting questions on this board and getting responses which stressed the importance of the F stop I have changed my philosophy on purchasing lens. Now the first feature that I look at is the F stop.

Happy Thanksgiving.

Reese 

[ebiggs1]

"Now the first feature that I look at is the F stop."

It always seems to be the more costly models. 🙄