Date: Fri, 30 Mar 2007 21:45:05 -0700
From: Moose <olymoose@xxxxxxxxx>
Subject: [OM] Re: Manual lenses to digital body - MF 1 Adapter
> I am assuming that this adapter will connect a bellows to a digital
body, although that particular option isn't mentioned...
>
It will indeed. However, you will certainly need an additional
extension
tube. Most DSLRs have a forward protrusion from the prism housing (not
E-300, 330) and the E-410/510 body is no exception.
http://www.dpreview.com/articles/olympuse410/page3.asp
This protrusion interferes with the tab on the auto bellows that
doubles
as lens release and mounting tab. So you need a tube between bellows
and
body. A 7mm works for my 5D. It's hard to say, but it looks from the
pictures that a longer one may be necessary with the 510. There are
aftermarket 11mm tubes available inexpensively that would work in that
case. The only possible drawback is that the minimum extension of the
combined bellows and tube is greater.
Moose
>>>><<<<
Thanks for the heads up on that, Moose; I dug out my Auto Bellows (I tend to
use the telescoping auto extension tube much more, for field work) and I can
see how the tab you mention would be a problem with that overhang on the
pentaprism housing in those photos of the 410/510.
I was looking at a 10 megapixel Lumix (having bought a 5 megapixel model for
my daughter last year, and having tried it out a few times myself) but if the
510 has a mechanical image stabilization capability, then I am leaning toward
that model.
It is interesting to see that this unit will have a CMOS sensor; this
technology seems to have come of age for digital imaging. Flipping through my
copy of the 5th edition of John Russ's "The Image Processing Handbook", I note
that the trend seems to be away from CCD's and toward CMOS sensors.
The more compact pixel spacing of CCD's might tend to give a better
resolution, but the higher energy requirements of a coupled charge sensor also
increases the noise generated by electrical interference in the circuitry.
While CMOS sensors have lower energy requirements, they also have more
circuitry (the signal amplifiers, for instance) right on the chip... which
again increases the noise from electrical interference. The added circuitry of
the CMOS sensor increases the spacing between pixels: this decreases
resolution, but, also serves to decrease the 'blooming' effect (trans-pixel
contamination from strong light sources) that CCD's are sometimes prone to.
So, there seem to be a number of trade-offs when choosing between the 500 (8
megapixel CCD) and the 510 (10 megapixel CMOS); but, since CMOS sensors have
unique registry values for each pixel (whereas CCD's offload entire rows of
pixels to their signal amplifiers), it is apparently possible to design
software that can (in theory) eliminate the noise characteristics of each
individual pixel... and in the end analysis, this will give CMOS technology an
edge over CCD's.
Thus, I am now leaning toward the 510 (with its CMOS sensor); and, I am glad
to hear that my bellows and favorite lenses will work (well enough) on that
particular model.
John M.
John Morton
http://OriginOfWriting.com
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