How to take an awesome close-up photo with new camera?

First of all, you'll want a tripod and a lot of light (as long as it doesn't hurt the animals).

You'll want the aperture as high as possible, to maximize depth of field (especially for the fish). you might also want to make the shutter speed a lower number, but if you move at all it will become blurry.

It really depends on the amount of light in the room, how it reflects off of the aquarium, how steady you can be when taking pictures, etc. as you practice you'll be able to get things less blurry.

Without an actual macro lens (a special lens for interchangeable lens cameras, and kind of expensive), you probably won't be able to get as close as you want without it being blurry. Also you will probably want to maximize your shutter speed as much as possible since the fish or the ferrit will probably be moving around quite a bit. (Probably shutter speed would have to be 1/1000 or greater, and apeture would depend on how much depth of field you want--the larger number indicates the sharper depth of field, and the ISO would depend on how grainy an image you can deal with--the higher ISOs would have more grain). The real challenge though would be lighting such subjects since you would probably need to depend on a lot of light so you can maximize your shutter speed and apeture (probably f4 or f5.6 would be the least). And since I'm guessing you don't expensive photography lighting equipment, you might try doing the work outside or investing in a few low cost floodlights. It would to help to experiment with that since photography is often all about the lighting.

Good luck!!!

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Set aperature at lowest numjber for shallow DOF

Use autofucus at Macro (the flower) setting,

and use tripod or perch to steady the camera.

I have the P850

If you think "PASM" is a mode, just put it on the picture of the flower and see how that works out for you.