Microphotography

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Robert - 06 Feb 2006 15:13 GMT

I am looking for a DSLR which has a mirror lock up. I want to reduce
vibration when using the body with a microscope or telescope.

For the same reason, the metering must be shutter priority and this must
function with only a T2 mount in place to connect the microscope /
telescope to the body.

Any suggestions please?

Robert

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Norm Dresner - 06 Feb 2006 16:16 GMT

>I am looking for a DSLR which has a mirror lock up. I want to reduce
>vibration when using the body with a microscope or telescope.
[quoted text clipped - 4 lines]
>
> Any suggestions please?

With shutter-priority, you're asking the camera to adjust the lens aperture
to get the right exposure. But you have no aperture connected to the camera
directly or indirectly to be adjusted.

Perhaps you mean aperture-priority where the camera assumes that the lens is
already set and it chooses the correct shutter speed?

Norm

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David Littlewood - 07 Feb 2006 00:42 GMT

>>I am looking for a DSLR which has a mirror lock up. I want to reduce
>>vibration when using the body with a microscope or telescope.
[quoted text clipped - 13 lines]
>
> Norm

Norm is right. Also, be aware that some DSLRs are less happy to meter
without a "proper" lens in place. My EOS 10D does just fine, as do other
EOS models, but I know others who use Nikons and they say it is less
satisfactory - there is a workaround, but it's more fiddly.

Even with mirror lock-up, it is best to use shutter speeds of 1 sec or
more, if you get into the 1/15 - 1/4 region you get more shake. Longer
speeds allow the vibration to settle down.

Focussing is more of an issue with a DSLR (or a film SLR for that
matter) - the lack of real-time viewing of the image is a drawback, and
the optical focus screen of most (all?) DSLRs is quite poor for
focussing on a microscope (or telescope).

There are better places to ask about this. The NG
sci.techniques.microscopy is good, but the Yahoo group
(Microscope@Yahoogroups.com) is better. And, BTW, the correct word is
photomicrography - I mention it as you will find more information (or
better information) if you use it.

David

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David Littlewood

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Matt Clara - 07 Feb 2006 19:07 GMT

> >>I am looking for a DSLR which has a mirror lock up. I want to reduce
> >>vibration when using the body with a microscope or telescope.
[quoted text clipped - 18 lines]
> EOS models, but I know others who use Nikons and they say it is less
> satisfactory - there is a workaround, but it's more fiddly.

I don't believe that's the case with any Nikon DSLRs that have mirror
lockup, or with the new D200.

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Regards,
Matt Clara
www.mattclara.com

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Norm Dresner - 07 Feb 2006 20:28 GMT

>> >>I am looking for a DSLR which has a mirror lock up. I want to reduce
>> >>vibration when using the body with a microscope or telescope.
[quoted text clipped - 21 lines]
> I don't believe that's the case with any Nikon DSLRs that have mirror
> lockup, or with the new D200.

The D50 and D70 cannot meter without a CPU lens. You're restricted to using
M-mode with these cameras. The D200 finally removed this restriction.
"Pro" Film bodies like the N90, F100, F5 & F6 also allow A-mode metering
with any lens but the Mass-Market cameras like the N75 and it's cousins are
as incapable as the D50/D70 in this regard.

Norm

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Matt Clara - 07 Feb 2006 23:54 GMT

>>> >>I am looking for a DSLR which has a mirror lock up. I want to reduce
>>> >>vibration when using the body with a microscope or telescope.
[quoted text clipped - 29 lines]
>
> Norm

Yes, that's what I said--the D70/D50 don't have mirror lockup, while the pro
line, D1 D1x, etc., do.

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Regards,
Matt Clara
www.mattclara.com

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Scott W - 06 Feb 2006 17:14 GMT

> I am looking for a DSLR which has a mirror lock up. I want to reduce
> vibration when using the body with a microscope or telescope.
[quoted text clipped - 6 lines]
>
> Robert

The 20D has a neat mirror lock up feature where if you use it with the
timer it will lock the mirror up on the shutter push wait 3 seconds and
then take the photo. If you don't use the timer it will lock the
mirror on on the first push and the take the photo on the second push.

Scott

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RichA - 06 Feb 2006 22:24 GMT

Olympus E-500. It is new, costs aboutg $699 with the kit lens.

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Toby - 07 Feb 2006 02:54 GMT

>I am looking for a DSLR which has a mirror lock up. I want to reduce
>vibration when using the body with a microscope or telescope.
[quoted text clipped - 4 lines]
>
> Any suggestions please?

I just bought a Nikon D200 which meters excellently with all sorts of weird
manual lenses, bellows, etc. I am using some extreme Olympus micro lenses
with RMS mounts on bellows, which is basically the same as microphotography,
and it works great--plus mirror lockup. For telescopes, however, you
probably want excellent high ISO performance--go with the full frame Canon
5D for that (but it is expensive).

Toby

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David Littlewood - 07 Feb 2006 16:34 GMT

>>I am looking for a DSLR which has a mirror lock up. I want to reduce
>>vibration when using the body with a microscope or telescope.
[quoted text clipped - 7 lines]
>I just bought a Nikon D200 which meters excellently with all sorts of weird
>manual lenses, bellows, etc.

Glad to know Nikon have improved this - what I said yesterday related to
the D100/D70 series, which my Nikon-using friend had problems with.

> I am using some extreme Olympus micro lenses
>with RMS mounts on bellows, which is basically the same as microphotography,

photomicrography!

>and it works great--plus mirror lockup. For telescopes, however, you
>probably want excellent high ISO performance--go with the full frame Canon
>5D for that (but it is expensive).
>
>Toby

David

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David Littlewood

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