Projection apparatus and projection lens

A projection lens, adapted to be disposed between a screen side and an image side, and the projection lens comprising:

• a first lens group, having a negative refractive power, and comprising a first lens, a second lens, and a third lens arranged in sequence from the screen side to the image side, wherein refractive powers of the first lens, the second lens, and the third lens are respectively negative, negative, and positive;
• and
• a second lens group, having a positive refractive power, disposed between the first lens group and the image side, and comprising a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged in sequence from the screen side to the image side, wherein refractive powers of the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens are respectively positive, positive, negative, negative, negative, positive, and positive, wherein a focal length of the first lens group and a focal length of the second lens group are respectively F1 and F2, and 1<|F1/F2|<1.5.

A projection lens, adapted to be disposed between a screen side and an image side, and the projection lens comprising:

• a first lens group, having a negative refractive power, and comprising a first lens, a second lens, and a third lens arranged in sequence from the screen side to the image side, wherein refractive powers of the first lens, the second lens, and the third lens are respectively negative, negative, and positive;
• and
• a second lens group, having a positive refractive power, disposed between the first lens group and the image side, and comprising a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, and a tenth lens arranged in sequence from the screen side to the image side, wherein refractive powers of the fourth lens, the fifth lens, the sixth lens, the seventh lens, the eighth lens, the ninth lens, and the tenth lens are respectively positive, positive, negative, negative, negative, positive, and positive, wherein the first lens group further comprises an eleventh lens having a positive refractive power and disposed between the screen side and the first lens, and the second lens group further comprises a twelfth lens having a positive refractive power and disposed between the first lens group and the fourth lens.