Could you give me an example fo a good quality low cost 100mm MF macro lens?

Thanks. I do think it is sharp and will work well for most of my needs. The one thing that worries me is that I like to take shots of living insects, and with this lens, I have to get to really close to get a close-up macro. I mean like an inch away. Is there a way to extend this distance out somehow, or do a need another lens for that.

This lens also takes pretty good portraits.

Here are some test shots I took last night. Tell me what you think of how the lens performed with a focus and what could be improved in another lens choice (if anything)

Mode: Auto with LED computer reading light for light source.









Mode: Auto with LED computer reading light for light source.






Mode: Auto Superior with LED computer reading light for light source.







Mode: Shutter Priority with shoe mounted External flash with diffuser






Mode: Shutter Priority with shoe mounted External flash with diffuser






Mode Auto with late afternoon natural light.

I was given an old Sigma 50mm f/2.8 1:1 Manual Focus Macro Lens for Pentax KA/K7/PKA/K-1. I am just wondering how you would rate this lens in comparison with what is available today? On a scale of 1 thru 10, 1 being a cheap kit macro lens and 10 being the best macro lens money can buy; where would you rate this sigma macro lens?