Jack Davis wrote:
> A closer proximity of lens and "film" would produce a sharper image..however
> imperceptible, but your answer is what I would guess in the case with pixels.
> I would think, however, that the same DOF might be possible with a somewhat
> larger aperture and diffraction reduced accordingly.(?)
>
I don't see why the second point would be true, the focal length would
be the same so the actual aperture would be the same size. You might be
right about the sharpness, but I would think lens characteristics would
be more important than the airspace between the objective and the
"sensor". One of the sharpest lenses I own is the 4 inch, (100mm), 5
element 4 group f3.5 Kodak Ektar on my Medalist II,, (6x9 on 120 film),
it's relatively simple geometry means that theres a lot of airspace
between it and the film, at least 6 times the distance as the equivelent
35mm lens, (Pentax 43mm limited), yet it's performance is similar, in
fact it's actually quite a bit better wide open. (I'd post a sample but
I don't have a medium format capable scanner set up right now).
> Thanks, Peter!
>
> Final thoughts on the issue,
>
> Jack
>
>
> --- On Fri, 9/12/08, P. J. Alling <[EMAIL PROTECTED]> wrote:
>
>
>> From: P. J. Alling <[EMAIL PROTECTED]>
>> Subject: Re: panasonic's new micro four/thirds camera: G1
>> To: "Pentax-Discuss Mail List" <[email protected]>
>> Date: Friday, September 12, 2008, 10:17 AM
>> Jack Davis wrote:
>>
>>> Will the fact that the sensor is closer to the lens
>>>
>> produce a "sharper" image?
>>
>>>
>>>
>> Probably not.
>>
>>> Will the image circle of existing 4:3 lenses not
>>>
>> completely cover the sensor, therefore, producing
>> vignetting, but increasing the telescopic effect?
>>
>>> Do to a gain in DOF, will small aperture diffraction
>>>
>> be reduced?
>>
>>>
>>>
>> No more than on current 4:3 cameras.
>>
>>> Please be gentle. ;)
>>>
>>>
>> Suffer.
>>
>>> Jack
>>>
>>>
>>>
>>> --- On Fri, 9/12/08, P. J. Alling
>>>
>> <[EMAIL PROTECTED]> wrote:
>>
>>>
>>>
>>>> From: P. J. Alling
>>>>
>> <[EMAIL PROTECTED]>
>>
>>>> Subject: Re: panasonic's new micro four/thirds
>>>>
>> camera: G1
>>
>>>> To: "Pentax-Discuss Mail List"
>>>>
>> <[email protected]>
>>
>>>> Date: Friday, September 12, 2008, 9:45 AM
>>>> They're still hobbled by the small sensor
>>>>
>> size. As
>>
>>>> technology improves
>>>> and 24x36mm sensors become more prevalent, (and
>>>>
>> there's
>>
>>>> no upgrade path
>>>> even possible), I think this will be relegated to
>>>>
>> a second
>>
>>>> class system,
>>>> sort of where 4:3 is headed today. The same issue
>>>>
>> that
>>
>>>> always comes up
>>>> when comparing formats, bigger is better, (higher
>>>>
>> image
>>
>>>> quality), if you
>>>> can afford it.
>>>>
>>>> Mike Johnson had an interesting take on lens
>>>>
>> compactness.
>>
>>>> He always
>>>> thought that amateurs liked telephotos for their
>>>>
>> extra
>>
>>>> reach, smaller
>>>> formats make for smaller long lenses with the same
>>>>
>> reach,
>>
>>>> so that would
>>>> be good. But it's not the effective focal
>>>>
>> length
>>
>>>> it's the physical
>>>> size that matters. Most amateurs want big lenses
>>>>
>> because
>>
>>>> they look more
>>>> impressive. My 400 captures the same image, (on
>>>>
>> my
>>
>>>> sensor), as your 800
>>>> on your's, but the 800 trumps.
>>>>
>>>> In other words size /still/ matters.
>>>>
>>>> Subash wrote:
>>>>
>>>>
>>>>> since no one seems to have posted the link
>>>>>
>> here... :-)
>>
>>>>> http://www.dpreview.com/Previews/PanasonicG1/
>>>>>
>>>>>
>>>>>
>>>>>
>>>> --
>>>> You get further with a kind word and a gun, than
>>>>
>> with a
>>
>>>> kind word alone.
>>>> --Al Capone.
>>>>
>>>>
>>>> --
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>>>
>>>
>>>
>>>
>> --
>> You get further with a kind word and a gun, than with a
>> kind word alone.
>> --Al Capone.
>>
>>
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>
>
>
>
>
--
You get further with a kind word and a gun, than with a kind word alone.
--Al Capone.
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