i have tried to search this forum for the following questions but thought someone might be able to explain it better in one spot: could someone break down the theory of pricing and megapixel amounts between these three phase backs, P21, P25, P30 plus series it seems that the P30 is cheaper than the P25 but has less megpxls, the P30 is 1.3 crop factor but has higher ISO, why does the P21 only start at Iso 100 and not 50? I would prefer to buy the P25 between all the three backs but I think it is the most $$$, can anyone really list the prices of each of these backs for me, without the 3 year added waranty?
I shoot fashion and lifestyle with a canon 1Ds Mk2 but want to get a DB for my contax 645 system.
As far as cost goes, it mostly boils down to sensor size. The bigger the sensor, the costlier it is to produce, and the more it costs to buy. The P25 is roughly 49mm x 37mm in size. The P30 and P21 are roughly 44mm x 33mm in size. Thats why the P25 is the most expensive of the bunch. The number of pixels on the chip can effect yield, but that's more of a second order effect on cost. MP is almost certainly a factor in marketing, so a company feels higher MP are more desired, and therefore people will be willing to pay more for them. Chip size trumps marketing, but for the same sized sensors, higher MP will cost more, somewhat because of yield, but mostly, I suspect, because of marketing.
Retail pricing (in USD) for the Phase backs is as follows (without extended warranty):
P21=$11,990; P25= $20,990; P30=$16,990; P45=$26,990
For the plus versions, add $3K.
For the extended warranty, add another $3K.