Halo with reflex
Halo with reflex
I am using my reflex to take pictures with my binocular microscope, I use a T2 ring and an adapter to eyepiece like that:
In all the photos a horrible halo appears. I have tried modifying the diaphram of the microscope, the height of the condenser, the exposure, more or less light ... and nothing.
How could I solve it?
In all the photos a horrible halo appears. I have tried modifying the diaphram of the microscope, the height of the condenser, the exposure, more or less light ... and nothing.
How could I solve it?
Re: Halo with reflex
Probably darken the inside of your adpater tubes, with black matte finish paint or matte black paper.
Afocal (camera lens over visual eyepiece) should also solve that.
Afocal (camera lens over visual eyepiece) should also solve that.
Re: Halo with reflex
To me this looks like a reflection in the tube too. You might place a small circular shade there that prevents the light from directliy hitting the inner surface of the tube. Like a small ring within the tube. There is self adhering flocking material availabe that cuts out reflections even better than flat black paint. I currently have no source for it but I would suggest to look where the astronomers buy their stuff. But my guess is that the shade will help more than the flocking.
Re: Halo with reflex
This (Doodlebug Beetle Black Crushed card stock from Hobby Lobby) is available in USA and cheap, but not self-adhesive :
http://www.photomacrography.net/forum/v ... etle+black
Or this paint: https://culturehustle.com/products/blac ... t-material
http://www.photomacrography.net/forum/v ... hp?t=36403
http://www.photomacrography.net/forum/v ... etle+black
Or this paint: https://culturehustle.com/products/blac ... t-material
http://www.photomacrography.net/forum/v ... hp?t=36403
Re: Halo with reflex
Thanks to all. I´ll try it.
Re: Halo with reflex
The last image seems to have a hot (bright) spot near the center. One of the things that can cause that is a light source that is not set up for Kohler illumination, such as a misadjusted condenser (or also a misadjusted light-source condenser if the microscope has one of those).
Put a piece of ground-glass or wax paper or kleenex over the light-well and see if the bright spot goes away. If it does, then it's an illumination source problem, and you might want to use a diffuser.
Put a piece of ground-glass or wax paper or kleenex over the light-well and see if the bright spot goes away. If it does, then it's an illumination source problem, and you might want to use a diffuser.
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Re: Halo with reflex
wporter wrote:The last image seems to have a hot (bright) spot near the center. One of the things that can cause that is a light source that is not set up for Kohler illumination, such as a misadjusted condenser (or also a misadjusted light-source condenser if the microscope has one of those).
Put a piece of ground-glass or wax paper or kleenex over the light-well and see if the bright spot goes away. If it does, then it's an illumination source problem, and you might want to use a diffuser.
I have a similar hotspot when imaging, however it is only present when looking at a large object such as an ant on my compound microscope? Basically if I want to look at something that takes up the entire field of view I get a horrible hot spot in my camera (but not through the eyepiece), could this be due to a similar problem or no?
Re: Halo with reflex
Sometimes the illumination is wonky if a very low power (1x to 5x) objective is used, so many condensers have provisions for these low-powers: the top lens of the condenser can be flipped out of the way; the top lens can be unscrewed and placed aside temporarily; or and under-condenser auxiliary lens can be swiveled into position. If none of these, or the addition of a diffuser between the light source and the condenser, remove the hotspot, it may be another problem like reflection.