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Forum: Pentax SLR Lens Discussion 12-27-2017, 04:31 PM  
SMC Pentax-FA 100mm F2.8 Macro
Posted By babbo natale
Replies: 13
Views: 1,610
UncleVanya the problem is the very recessed front element. I measured it tonigt: it's 35mm from front element to filter flange. Add 150mm of lens body at 1:1 and the distance from sensor to the mount flange on the camera body of 45.46 mm you have 195,46mm that subtracted from 306mm (minimal focus distance at 1:1) leave just 111,54mm from filter flange to subject distance. This is just a little more (66mm) than 1:1 focus distance (45,54mm) on D FA. 50/2,8. My doubt is if it's worth while to change the fa 100/2,8 macro with a D FA 100/2,8 to recover these 35mm considering that optically these lens are identical. Your idea to put a 1.4x converter solve the distance problem but demage the wonderful optic quality of the lens. Sorry for my bad english.
Claudio
Forum: Pentax SLR Lens Discussion 12-27-2017, 07:14 AM  
SMC Pentax-FA 100mm F2.8 Macro
Posted By babbo natale
Replies: 13
Views: 1,610
I have bought on Ebay a wonderful SMC Pentax-D FA 50mm F2.8 Macro. The only problem is the short distance from subject at 1:1 ratio to light well with the flash. In the past I used a 135/3.5 with tubes and the distance was enough. I thinked to solve my problem with the 100/2.8, but the external lens is 5cm inside of lens body therefore subject is at the same distance of 50/2.8. do you know if the D FA 100/2.8 do not have the same problem of FA 100/2.8?

thanks

claudio
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