Shopping Black Friday sales, I have found these two lens are basically the same price. I'd like to have one for my Sony a6000 and not sure which would be best. I've researched, but would like a personal opinion from someone who owns one or the other. I mostly shoot grandchildren(not literally)...twin 3 yr old girls and a baby boy on the way for Christmas. I also will use it for travel and possibly beach sunsets. Any suggestions?

I'd also like to say I'm very grateful for all I've learned from this website. I check it daily and though I don't always contribute, I learn so much from all you knowledgeable people who do.

Thanks in advance and Happy Holidays!!!

closing down the lens by one stop would give a similar depth of field, its not a perfect match if you look at a dof calculator, but close enough for most people.

By closing down the aperture by 1 stop you are recording 1 stop less light the image would be 1 stop under exposed
I chose to raise the ISO by 1 stop to compensate the alternative would be to half the shutter speed (1 stop difference).

if the shutter speed was 1/60th then 1/30th would be needed to keep the same exposure. This particular scene it doesn't particularly matter about the shutter speed.

with micro 4/3rds as the original camera at 18mm you would want 36mm on full frame and close down 2 stops and raise the iso 2 stops.

If you flip this on its head trying to match a full frame photo with a crop sensor or m43 camera. The surprising thing is you need a better lens for the smaller format. With 1 and 2 stops difference for each format.

You are also enlarging the negative more which is going to reveal more of a lenses defects e.g chromatic aberration.
It probably is fair to say the larger the format of the negative the less demanding is the Image Quality required from the system, big is beautiful

Heavy not so easy to take to a location but perhaps why people still love the medium and larger formats even 35mm film.