Originally posted by Reddaddy ld 55mm Pentax 1:4 macro lens on a K5 in M. My viewfinder is filled and in good focus, but he photos are all blurry. I have tried focal lengths of 15 to 135, makes no difference.
I don't understand this. What is the "focal lengths of 15 to 135" supposed to mean? When using a manual lens and the camera asks you to input focal length, you input the number that is written on the lens. In this case 55mm. If you input the wrong number, the SR may introduce blur. Or are you talking about shutter speed? Because shutter speed of 1/125 is not very fast. In macro situations blur is exaggerated
Anyway, here is what you do. The whole tutorial to get nice macro product photos. You set the screen brightness to around maximum on the phone, and select it so that the screen stays active for a minute or two, so you don't have to constantly unlock it. Now place the camera on the table and put the prop the phone sideways in front of it (long side of phone touching the table, screen facing the camera lens). Use books or something to prop things up. Set camera to M mode, ISO 100, and 2sec timer. The 2 sec timer is important. Now place the camera closer until the screen of the phone fills the frame. Set lens to wide open aperture (lowest f-number) and focus. You can try using live view and focus peaking if your camera supports that. Now set the lens aperture to somewhere between f8 and f16. Press the green button, and the camera will automatically set the shutter speed. Now press the shutter button, and don't touch the camera, phone, table until the exposure is complete. It takes two seconds, then photo is taken, and maybe a dark frame after that for NR.
Since the phone screen is flat, the DoF should not be a problem, as long as the screen is parallel to the sensor. If DoF is too narrow at f8, set the lens to a bigger f number, like f14, f16. This might make the photo fuzzier/less sharp, but it will give you more depth of field. If you shoot raw, you can use photoshop to adjust the photo and make it much sharper and contrasty (easier to read the text and icons in it). If you don't have photoshop you can use a free program like FastStone, Gimp, RawTherapee.. maybe even Google's Picasa?
Oh, one more thing. With old lenses you have distance scales on the focus ring. These distance scales go from the camera sensor to the in focus. So you can use a measuring tape and set the focus by number. If you measure from the subject to the camera mount, you have to add 4.5cm.