Re: A thinner sensor stack may be possible after all!
I want to thank everyone for the suggestions and guidance.
After much deliberation at this point and though I was really considering biting the bullet for purchasing an M 24mm f3.8 Aspherical lens, and though I could have used the lens on an unmodified A7r camera at about f8, as Charles has indicated I find the focal length just too close to that of my WATE at 21mm, I used to enjoy the 24mm focal length with my Leica R cameras and normally carried it instead of my 21mm Super Angulon lens that I had generally due to the filter size.
As to the M 28mm Summicron, at this point it is just too expensive when combined with requiring me to also include the cost for the $400 upgrade to the A7r sensor stack and at this point to speculate that future cameras can also have a thin sensor stack, I am holding off on this purchase.
Though the ZM 25mm f2.8 may be OK as an option, it too would always require a thin sensor stack I have at least for now decided to hold off on such a purchase.
Since it doesn\'t appear that I can find an M 28mm lens that can offer high performance into the edges and the corners even at about f8 without a thin sensor stack, it pains me but at least for now I think that I will just bear the extra weight and volume of carrying my R 28mm f2.8 V2 lens into the field.
Any of the options would have only saved me about 6 oz to my pack/bag weight plus the 3 oz weight of the Novoflex R to NEX adapter (plus the convenience of having 1 or 2 adapters if I included the helicoid). If I can live with going from the 40mm M-Rokkor to the WATE with nothing in between that would save me over 18 oz between the weight of the R 28mm lens and the Novoflex adapter. 18 oz of weight savings is really something to consider.
When I purchased my M 90mm f2.5 Summarit, that made much more sense to me for volume and weight savings when I did not want to carry my R 100mm f2.8 Apo-Macro-Elmarit (which I will probably substitute for the 90mm Summarit particularly when I want to be prepared for macro work, though I will test the performance of Summarit with the heliicoid). That was a weight savings of 14 oz plus the weight of the Novoflex R to NEX adapter. That savings was the weight of my WATE plus the 67mm filter adapter.
Rich
Mar 04, 2015 at 07:24 AM
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