Can anyone help me identify these four cactus?

[Ygolonac]

Hi - i have these four but i'm not shure what kind they are.

If you have any good advise considering pots, size etc please feel free to let me know.

Thank you - Martin/Denmark

[teo]

#1 - Euphorbia enopla (not a cactus)
#4 - Mammillaria sp.

[esp_imaging]

2 Possibly Mammillaria sp
3 Opuntia sp.

Better, close up photos that aren't backlit would help - it can be quite hard to id plants even with great photos.

[CactusMad]

2 looks like parodia scopa but as already said we need better lit photo's to be sure.

[DaveW]

Don't try to photograph plants against the light in future Martin, with the window behind them since that puts the side you are photographing in shadow, therefore the camera will correct the exposure so it does not overexpose the window which is far brighter than the plants. Move them away from the window onto say a table with the window light behind you, but not allowing your shadow to fall on the plants.

[Ygolonac]

Thank you very much - I will take new pics soon and post them