Fascinating stuff! Thanks for sharing, Darren.
On Tue, Sep 25, 2012 at 1:00 PM, Darren Addy <[email protected]> wrote: > Falk Lumo replied to (some of) my questions, although in a rather > incomplete and data-light way: > - - - > > Hi again, > > you address many interesting questions here. Unfortunately, it isn't > my current focus of interest, so I'll confine myself to share some of > my understandings and opinions with you. I won't be able to do own > research on this. > > Here we go ... > > 1. Digitally optimized vs. film lenses > > I think that distinction is a thing of the past when it comes to > dSLRs. Due to the retrofocus design of SLR lenses, the angle of > incidence even of outer rays never becomes too large. > > It used to be an issue but I think the microlens designs solved that. > Olympus created telecentric designs and a huge mount for a small > sensor for nothing. This is the main reason we got 湩T now. > > 2. Shorter flange distances > > The NEX-7 fails miserably with wide angle lenses on its shorter flange > distance. Ask NEX-7 users. OTOH, the Leica M9 performs rather nicely > with wide angle film lenses (M mount). So, a proper microlens design > is crucial and I don't buy into this Exmor is thinner speech from > Sony. > > When large angles of incidence become a problem, then larger pixels > (read fewer) help more than anything else. This is why the NEX-5 may > have a better image qualite than NEX-7. > > 3. Fringing > > Wide angle lenses should produce more CA than sensor fringing, maybe > with the single exception of the new 24MP Sony APSC sensor. > > 4. Vignetting > > But when large angles of incidence become a problem, you should see it > first with vignetting becoming extreme. DxO looked at that, the link > is here: > http://www.dxomark.com/index.php/Publications/DxOMark-Insights/F-stop-blues > > You can derive and compare the loss of large incident rays from their > data, for various sensors. > > > And that's about it what I can contribute to the discussion. Thank you > for your understanding. > > > Kind regards, > Falk > > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- -bmw -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
