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<p>[QUOTE=&quot;rmpsrpms, post: 2536975, member: 31773&quot;]The 2x shots for both the 89PE and the 75ARD1 were stacked with ~7 shots. At this magnification and effective aperture it&#039;s hard to avoid stacking.</p><p><br /></p><p>The chromatic aberrations of the 75ARD1 start to show up when shooting at these higher mags.&nbsp; The 75ARD1 is optimized at 1:1, and usable from 1:2 up to 2:1. So it&#039;s a natural lens to compare with the 89PE. Take a look below at a 100% crop comparison of the mintmark using these two lenses:</p><p><br /></p><p><img src="http://i943.photobucket.com/albums/ad273/rparkhurst/2xCompo1.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p>These shots are very typical for what I see from both the 75ARD1 versus true apochromats. The 75ARD1 shot is bold and contrasty, with high saturation, an aesthetically pleasant result. Colors are a bit of a mix depending on which shot was used at which topographical level. The most telling areas are the highlights, which are showing green and magenta haloes on the 75ARD1. The 89PE is clean in these areas, and the colors in other areas are more neutural. I think of the images from true Apo lenses as a bit &quot;sterile&quot; since they don&#039;t have any embellishment due to CA. Note that the 75ARD1 is a very well-corrected lens...most other lenses will look much worse. But it takes an apochromatic lens to completely eliminate color fidelity issues.</p><p><br /></p><p>edited to add: these were both taken at f/4, so have similar resolution. Both lenses are diffraction-limited at f/4. Note there is a piece of dust on the left side of the mintmark on the 75ARD1 shot...I should have blown it off before shooting![/QUOTE]</p><p><br /></p>

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