I have used two Pentax lenses of Tully, at-x 28-70 2.8 pro and at-x 20-35 2.8 pro. At present, 28-70 has been resold and 20-35 is still in use.
Tully gave me the feeling that:
The materials and workmanship are definitely the closest to the original factory. Metal lens, large-caliber glass, 28-70 2.8 is all metal, close to 1Kg, while my 70-200 2.8 is only 1. 1Kg.
Tuli's high-end lenses are all designed with internal zoom and internal focus, which is very good! This is better than many original cameras. Canon 24-70 2.8 and Pentax 16-50 2.8 both zoom, but Tully folds the zoom into a lens barrel, and the lens length will not change due to zooming and focusing.
Tully's coating is very poor, at least much worse than Pentax's smc. Ghosts and glare are unbearable when backlit, or it may be that Pentax's smc coating is too strong, but even users of Nikon and Canon say that Tully's lens is the king of smoothness, in other words, the backlight is dead.
The wide angle of Tuli lens is better than telephoto, especially the ultra-wide angle. Although 16-35 is not available from Pentax, it is so good from Nikon and Canon, so we know that the wide angle of Tully is really good, which is why I left 20-35 for 28-70, and it is rumored that 16-35 of Tully is a patent of Pentax.
The shots of Tulip are all relatively early, and the shots that may have a good reputation on the film machine may be mediocre on the digital camera. For example, my 28-70, when I used it on a film SLR, was really a bull's head. In terms of numbers, the maximum aperture is very fleshy, and the 50-70mm part is basically not sharp at all.
Bentley lenses don't have motors and focus on the camera body motor, so the focusing speed will be slower than that with mirror motors (at present, only Pentax original factory and Sigma have Pentax lenses with mirror motors).
Tuli lens is lighter in color and tone than Pentax da and dal lenses, which is very Japanese.
This is the performance of 28-70 2.8 on the film machine. The anti-glare ability is really not very good when the backlight is visible.
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The following questions are about portraits:
The sharpness of Tully lens is not very good, and there is no large aperture, so the shooting of portraits is limited.