AllenClapp
Elite Cafe Member
Does anyone know the maximum depth of field for a Meiji EMZ-5 microscope? I have found it for Leica scopes, but not Meiji.
Depth of Field for Meiji EMZ-5 microscope
- Thread starter AllenClapp
- Start date
Sinterklaas
Elite Cafe Member
Hi Allen,
here on this website it says the working distance is 93mm or 3.7" is that what you where looking for?
And if you scroll down there is more:
Extended Working Distances: 34mm – 251mm (With auxiliary lenses and eyepieces)
EDIT: I see you wanted to know the DOF not the working distance. I couldn't find it either. Maybe you can send them an email or give them a call.
Or maybe there is a way to find it out. If you would look at the piece of wire, focus on the top. Then mark where it gets out of focus. You could approximate the DOF I think.
here on this website it says the working distance is 93mm or 3.7" is that what you where looking for?
And if you scroll down there is more:
Extended Working Distances: 34mm – 251mm (With auxiliary lenses and eyepieces)
EDIT: I see you wanted to know the DOF not the working distance. I couldn't find it either. Maybe you can send them an email or give them a call.
Or maybe there is a way to find it out. If you would look at the piece of wire, focus on the top. Then mark where it gets out of focus. You could approximate the DOF I think.
Last edited:
rweigel
Elite Cafe Member
I‘ve got no specific information about your Meiji microscope, but found an interesting snippet in an article about Nikon microscopes.
The conclusion there was, less zom factor + higher magnification oculars = bigger depth of field for the same magnification
The conclusion there was, less zom factor + higher magnification oculars = bigger depth of field for the same magnification
AllenClapp
Elite Cafe Member
thanks for trying.Hi Allen,
here on this website it says the working distance is 93mm or 3.7" is that what you where looking for?
And if you scroll down there is more:
Extended Working Distances: 34mm – 251mm (With auxiliary lenses and eyepieces)
EDIT: I see you wanted to know the DOF not the working distance. I couldn't find it either. Maybe you can send them an email or give them a call.
Or maybe there is a way to find it out. If you would look at the piece of wire, focus on the top. Then mark where it gets out of focus. You could approximate the DOF I think.
Old Gunsmith
Member
Allen,
This distance is usually not listed due to all of the variables. I had to figure this out once for some reason that I do not remember. This is how I did it. I clamped a stiff piece of paste board in my ball vice so the edge was plumb with the surface. I used one of those cards that come in the credit card junk mail. I put a binder clamp on the card about half way up. I then focused the scope on the top of the clamp. Without changing the focus, I moved the clamp up until it started to get out of focus then marked the top of the clamp using an exacto knife. I then moved the clamp down until it started to get out of focus again and marked the position of the top of the clamp. Measure between the marks with a caliper and that is your depth of field. The edge of the card needs to be parallel with the scope axis. What ever you use to clamp in the ball vice needs to be stiff enough that it does not bow under the weight of the binder clamp but soft enough that it won't damage the lens if you accidently hit it. I found that my scope varies in this distance depending on the magnification.
Hope this helps. Just a bit of Hillbilly engineering.
Dennis
This distance is usually not listed due to all of the variables. I had to figure this out once for some reason that I do not remember. This is how I did it. I clamped a stiff piece of paste board in my ball vice so the edge was plumb with the surface. I used one of those cards that come in the credit card junk mail. I put a binder clamp on the card about half way up. I then focused the scope on the top of the clamp. Without changing the focus, I moved the clamp up until it started to get out of focus then marked the top of the clamp using an exacto knife. I then moved the clamp down until it started to get out of focus again and marked the position of the top of the clamp. Measure between the marks with a caliper and that is your depth of field. The edge of the card needs to be parallel with the scope axis. What ever you use to clamp in the ball vice needs to be stiff enough that it does not bow under the weight of the binder clamp but soft enough that it won't damage the lens if you accidently hit it. I found that my scope varies in this distance depending on the magnification.
Hope this helps. Just a bit of Hillbilly engineering.
Dennis
rweigel
Elite Cafe Member
Hello Dennis,
if your microscope changes the focal distance while you change the zoom, it might not be adjusted to parafocality. How much does it change? Some mm can be compensated with this adjustment, severe changes in focal length might have different reasons.
Cheers
Ralf
if your microscope changes the focal distance while you change the zoom, it might not be adjusted to parafocality. How much does it change? Some mm can be compensated with this adjustment, severe changes in focal length might have different reasons.
Cheers
Ralf
Old Gunsmith
Member
The focal distance does not change, it's the depth of field that changes at different magnifications. The above instructions assume the scope is adjusted parafocally.
Sponsors
