Pentax SMC 100mm f/4.0 Macro 1:2

Initial Impressions:

• Off focus rendering is excellent in this lens
• Outstanding in terms of color and contrast
• Lens has 3D image effect giving a smooth boken in the background
• All test shots are done in f/8.0, I have not tested wide open aperture
  
• Quite sharp
• 1:2 macro can be done with precision in focusing
• Great focusing ring for precision
  
• K version instead of M and I see no 'M' on the front
• Though difficult due to narrow DOF, the lens manual focusing can catch up with bee in my 1st attempt. With practice, I think I can use this Macro on moving insects

Related:

• Tamron 70-300 Di LD Macro
• Pentax SMC-A 50mm f/2.8 Macro 1:2
• Vivitar AT-22 Extension Tubes
• 1:1 Macro with Extension Tubes
• Cosina 1:1 matched macro adapter
• Kenko 2x Macro Teleplus MC7
• Hin's Camera Gear