Your solid cat 600m lens is a constant F8. Try capturing fast motion on that. The central mirror on the front of the lens also gives it wierd bokeh-- donut-shaped highlights might excite Homer Simpson, but for most uses (esp. pro) are pretty distracting.
This lens is a constant F2.8; it'll smoke any mirror lens. Chromatic aberation with glass vs. mirror at that length you say? APO optics eliminate that.
@billy bob thornton Yeah, most lenses perform pretty poorly at full aperature, but stop it down one or two stops and it should be pretty sharp. So, you're getting a very sharp 4-5.6 and a usable 2.8 vs other lenses that aren't sharp at 4-5.6 and don't have 2.8 at all.
And lugging it around? That's what an intern is for.
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@Frankenstein Black
Your solid cat 600m lens is a constant F8. Try capturing fast motion on that. The central mirror on the front of the lens also gives it wierd bokeh-- donut-shaped highlights might excite Homer Simpson, but for most uses (esp. pro) are pretty distracting.
This lens is a constant F2.8; it'll smoke any mirror lens. Chromatic aberation with glass vs. mirror at that length you say? APO optics eliminate that.
@billy bob thornton
Yeah, most lenses perform pretty poorly at full aperature, but stop it down one or two stops and it should be pretty sharp. So, you're getting a very sharp 4-5.6 and a usable 2.8 vs other lenses that aren't sharp at 4-5.6 and don't have 2.8 at all.
And lugging it around? That's what an intern is for.