The Pro Master 100 macro

[mfophotos]

The "macro adapter" on that lens (my daughter has the equivalent Nikon version) is only a diopter. For those that

obviously don't know that -- diopters are magnifying lenses, and are for close-ups only. They also end up reducing

your focus range from a few inches to a few feet or so, depending on the lens/diopter combo. So, of course, with the

macro adpater, the lens won't focus to infinity...but you also would not be shooting a macro shot at infinity, anyway.

Without the adapter, you get the full focus range.

[cymen_vig]

<p>I have this lens in Vivitar brand (manual focus) with the matching 1:1 diopter. It can't focus to infinity with the 1:1 adapter. It is meant for macro at 1:1. Not macro at inifity which is kind of an odd idea. This lens combined with one of the 6 MP Pentax bodies makes a really great hand held macro platform as it is very light.</p>

<p><a href=" src="http://farm1.static.flickr.com/227/472166262_6383bc99f3.jpg?v=0" alt="" width="500" height="333" /> </a></p>

<p><a href=" src="http://farm1.static.flickr.com/206/469188583_762eabaf32.jpg?v=0" alt="" width="500" height="333" /> </a></p>

<p><a title="IMGP1692-03 by Cymen, on Flickr" href=" title="IMGP1692-03 by Cymen, on Flickr"><img src="http://farm1.static.flickr.com/204/472185395_0f6299abb3.jpg" alt="IMGP1692-03" width="500" height="333" /> </a></p>

<p>More from this lens: <a href=" 100mm f3.5</a> <br /> Also the <a href="http://flickr.com/groups/cosina/pool/">Cosina 100mm f3.5 pool</a> at Flickr</p>

<p>It helps quite a bit to have a split prism focusing screen. I think it is very sharp long before f8. Now I have the Vivitar 105mm f2.5 (Kiron really) macro, Tamron 90mm f2.8 and f2.5, and a couple more but I still think the Cosina 100mm f3.5 macro (the lens that is the topic of this thread) is a great buy.</p>

[jgredline]

<p>The problem with my lens is that it does not focus to infinity with the adaptor off. I think there is something wrong with my copy.<br>

 </p>

[cymen_vig]

<p>Ah! I misunderstood. That is an odd problem.</p>