Trinocular Microscope Adaptor ?
Moderators: rjlittlefield, ChrisR, Chris S., Pau
Trinocular Microscope Adaptor ?
Hi there,
I have a trinocular microscope, and the photoport is 23,2 mm threads.. Is this the same as C-mount ?
I also have one of these aftermarked T-2 to 23,2 mm adaptors (no threads).
When I use this adaptor it´s a little bit "wobbly".. I´ve searched with google but I´m not shure what to search for..
Want to use my EOS 7D on the microscope.
Hope anyone out there can help me
I have a trinocular microscope, and the photoport is 23,2 mm threads.. Is this the same as C-mount ?
I also have one of these aftermarked T-2 to 23,2 mm adaptors (no threads).
When I use this adaptor it´s a little bit "wobbly".. I´ve searched with google but I´m not shure what to search for..
Want to use my EOS 7D on the microscope.
Hope anyone out there can help me
- Charles Krebs
- Posts: 5865
- Joined: Tue Aug 01, 2006 8:02 pm
- Location: Issaquah, WA USA
- Contact:
My micrscope is the AmScope Model No: T230A..
I can provide you with some photos later if you need.
This is my current adaptor:
http://cgi.ebay.com/Microscope-Adapter- ... 805wt_1141
I can provide you with some photos later if you need.
This is my current adaptor:
http://cgi.ebay.com/Microscope-Adapter- ... 805wt_1141
- Charles Krebs
- Posts: 5865
- Joined: Tue Aug 01, 2006 8:02 pm
- Location: Issaquah, WA USA
- Contact:
Harald,
I looked at a picture of an Amscope Model No: T230A, and it appears to have a "standard" trinocular tube. This tube has the same inner diameter as most microscope eyepiece tubes. It is commonly referred to as having a 23mm inner diameter, although the actual diameter of the eyepiece barrel that gets inserted is 23.2mm (the other standard eyepiece tube size encountered is nominally 30mm inner diameter).
The photo below shows your adapter on a microscope. The microscope might not be exactly the same as your Amscope, but the Amscope should have the shiny tube seen as "A". (The photos of the Amscope T230A I've seen have this tube).
At the top, the inner diameter of tube "A" should accept eyepieces (and adapters) that have a 23.2mm outer diameter. The inside top of tube "A" should not be threaded, but smooth! Are you sure that yours is threaded? An eyepiece or your adapter should make a "slip-in" fit into this tube (at "C"). The actual "fit" varies somewhat. Sometimes it is a little "snug", other times it may feel a little too "loose". (Most of the older SLR camera adapters actually clamp around this tube rather than inserting into it like an eyepiece). If your "slip-in" adapter wobbles too much with your camera attached I would suggest you shim up the connection so that is makes a nice "snug" fit. (Depending on how sloppy it is, you might be able to do it simply with a narrow strip or two of tape).
I looked at a picture of an Amscope Model No: T230A, and it appears to have a "standard" trinocular tube. This tube has the same inner diameter as most microscope eyepiece tubes. It is commonly referred to as having a 23mm inner diameter, although the actual diameter of the eyepiece barrel that gets inserted is 23.2mm (the other standard eyepiece tube size encountered is nominally 30mm inner diameter).
The photo below shows your adapter on a microscope. The microscope might not be exactly the same as your Amscope, but the Amscope should have the shiny tube seen as "A". (The photos of the Amscope T230A I've seen have this tube).
At the top, the inner diameter of tube "A" should accept eyepieces (and adapters) that have a 23.2mm outer diameter. The inside top of tube "A" should not be threaded, but smooth! Are you sure that yours is threaded? An eyepiece or your adapter should make a "slip-in" fit into this tube (at "C"). The actual "fit" varies somewhat. Sometimes it is a little "snug", other times it may feel a little too "loose". (Most of the older SLR camera adapters actually clamp around this tube rather than inserting into it like an eyepiece). If your "slip-in" adapter wobbles too much with your camera attached I would suggest you shim up the connection so that is makes a nice "snug" fit. (Depending on how sloppy it is, you might be able to do it simply with a narrow strip or two of tape).
Harold, I use to own an Amscope. The adapter you have should fit into an eyepiece hole fine, with no wobble. Mine did.
I also bought this one for the trinocular tube.
http://cgi.ebay.com/Microscope-Adapter- ... 2eb3b3cb82
It goes on the outside of the tube and clamps to it. Then you drop an eyepiece lens into the hole inside, then you mount the camera on the T-ring. Cheaper, works great. In fact, it worked better than the more expensive one.
I also bought this one for the trinocular tube.
http://cgi.ebay.com/Microscope-Adapter- ... 2eb3b3cb82
It goes on the outside of the tube and clamps to it. Then you drop an eyepiece lens into the hole inside, then you mount the camera on the T-ring. Cheaper, works great. In fact, it worked better than the more expensive one.
- Charles Krebs
- Posts: 5865
- Joined: Tue Aug 01, 2006 8:02 pm
- Location: Issaquah, WA USA
- Contact:
Mitch,
"Canon CMOS sensor with 2x lens equivalent to 12x~15x eyepiece (varys by CMOS sizes)"
What this means is that the adapter is designed to provide a 2X magnification on the camera sensor. A 2x magnification onto a DSLR camera sensor records a view approximately equal to what the observer will see if they are looking through microscope eyepieces of roughly 12X to 15X. The description correctly states that this will be dependent on camera sensor size.
No adapter designed for SLR or DSLR cameras that I am aware of provides (or at least should not!) anywhere near a 10-12X magnification onto the sensor. The image results would be terrible, and you would be recording a very tiny amount of what is seen through the eyepieces (in the neighborhood of 12%). Any photomicrographer I know would, and should, find this totally unacceptable. A magnification of 10-12X onto the film/sensor plane would be acceptable if you were photographing onto 5x7" (or possibly 4x5") sheet film!
Your are conflating two entirely different things. The description given at the link above for those adapter says:By the way, the adapter you have, says it is 2x. But if you read the fine print, it is closer to 10-12x.
"Canon CMOS sensor with 2x lens equivalent to 12x~15x eyepiece (varys by CMOS sizes)"
What this means is that the adapter is designed to provide a 2X magnification on the camera sensor. A 2x magnification onto a DSLR camera sensor records a view approximately equal to what the observer will see if they are looking through microscope eyepieces of roughly 12X to 15X. The description correctly states that this will be dependent on camera sensor size.
No adapter designed for SLR or DSLR cameras that I am aware of provides (or at least should not!) anywhere near a 10-12X magnification onto the sensor. The image results would be terrible, and you would be recording a very tiny amount of what is seen through the eyepieces (in the neighborhood of 12%). Any photomicrographer I know would, and should, find this totally unacceptable. A magnification of 10-12X onto the film/sensor plane would be acceptable if you were photographing onto 5x7" (or possibly 4x5") sheet film!
Here's what my experience was. If you use this adapter, with the 2x lens built in and connect it to a T1i, you will get approximately the same size final image as if you use the other adapter, that does not have any built in lens in it, and then stick your 10x eyepiece lens in the hole and attach the T1i. Not exact, but very close.
- Charles Krebs
- Posts: 5865
- Joined: Tue Aug 01, 2006 8:02 pm
- Location: Issaquah, WA USA
- Contact:
Mitch,
Yes, it is entirely possible to get a 2X on sensor magnification by using a 10X viewing eyepiece with the adapter you linked to above. When the microscope is properly set-up and properly focused, this is accomplished only if the 10X viewing eyepiece aperture is actually situated considerably higher than was designed for visual use (in relation to the intermediate image location as per: http://www.krebsmicro.com/pdf/trinoc_a3.pdf ).
Doing so, I have seen results that were quite good, and results that were quite bad. I know of no way to predict the outcome in any given case unless you try it. But the key point I was trying to make is that when used in this manner the magnification on sensor is not the 10X that is marked on the eyepiece, but (if done "properly") much less, more in the 2-2.5X range.
So when you say:
Yes, it is entirely possible to get a 2X on sensor magnification by using a 10X viewing eyepiece with the adapter you linked to above. When the microscope is properly set-up and properly focused, this is accomplished only if the 10X viewing eyepiece aperture is actually situated considerably higher than was designed for visual use (in relation to the intermediate image location as per: http://www.krebsmicro.com/pdf/trinoc_a3.pdf ).
Doing so, I have seen results that were quite good, and results that were quite bad. I know of no way to predict the outcome in any given case unless you try it. But the key point I was trying to make is that when used in this manner the magnification on sensor is not the 10X that is marked on the eyepiece, but (if done "properly") much less, more in the 2-2.5X range.
So when you say:
it creates unnecessary confusion, because you're comparing apples (magnification on sensor) to oranges (magnification as seen through the eyepieces).... says it is 2x. But if you read the fine print, it is closer to 10-12x