my A100 won't focus when less than 40cm from the subject, what should I do\buy?
I like taking close-up pictures of for example flowers but for some reason my A100 is way worse than my cheap cybershot t5 when it comes to this, because it just won't focus!
I have to bring it like 40 cms away before it can focus (even on manual focus) and that's really annoying.
What is it that's causing this?
I'm using the kit 18-70mm lens, would it be solved by buying a lens <18mm or does that have nothing to do with this?
28mm lensing ... decreased MFD
With just a lens:
- Minolta AF 28 f/2.8, which will get you down to 30 cm (11-inches) (here's your proof)
- Minolta AF 50mm f/1.7 will only get to 45cm ~18-inches.
I believe the addition of Macro Tubes to the lens might help in decreasing the minimum focus distance, but having never used them, myself ... I cannot be that sure of this side-effect. I know it sure wipes out infinity focus at the other end.
Adding a teleconverter (T/C) only adds to the minimum focus distance, so that really isn't an option. Some lens are desgined for even closer operation.
Super wide angle lens offer some serious close-up. too. The TAMRON SP AF11-18mm f/4.5-5.6 will get you within 25 cm (9.8-inches).
Shot at 18mm - f/5.6
I suppose you can use the depth of field (higher f-stops) to try and exagerate this minimum, but that reduces your light significantly. f/8 would be your start point, and that's two full f-stops down from f/4.
Anyway, good luck ... and please keep us informed of your results.
BTW: Each and every lens has the minimum focusing distance on it ... because it is THAT important. If not, you can dial the focusing ring on the lens down and see it for yourself.