I came across an idea of making some closeup photos of my laser. After I did some shots I realized that DSLR with good Tamron lens is not enough.
Need another expensive macro lens?
- No!
I got some brilliant idea. In oldschool photography it is said that making high resolution macro photos is possible with regular lenses also. All it need to be done is just to reverse the lens. In normal conditions focal plane is closer to the lenses that an object. In macrophotography it is different. Focal point of an image lies further from the lense than an object itself. So after we flip the lens, the light paths remains unaltered by optical aberrations.
Drawback of this method is very shallow depth of image. Only fraction of milimeter in depth will be sharp becouse of very high image scale and fast focal ratio of the lens. What is more, we MUST use the tripod, becouse even small movements of the camera cause blurs. Another issue is lack of light, efen "bright" f/2.8 lens after reversing becomes very dark, becouse focal plane is more than twice longer than normally.
Let's start. This is non cropped photo of the monitor taken normally with the lens in closeup:
we can hardly see some bands from the LCD structure.
And here we go with the lens flip:
also uncropped, we have at least 10x higher image scale!
The last pictures of the poor match. It burns right after that..
This is the example of how shallow image depth is.
Here is the expanding lens of the Firedragon's DPSS module. It is very tiny, has 5mm total outer diameter
we can crop the image to see more on the surface:
It is dual concave and looks good quality.
The focusing lens is a diferent story:
It is non coated, we can see microscratches, microbubbles and dust on its surface. I must replace this lens for better one, maybe I can achieve up to 10% more power?
It's time for main course now!
<500mW firing through the tiny lens:
some particles in the air are heated:
Too far? Want to be closer?
Yes, please.
Even closer.. Some particle is rotating in the beam like an asteroid in the sun light..
pin-point focus of the laser beam. Don't know what is the diameter but it is in 1/10 of mm range. Third particle from the left is like the meteor burning in the Earth's atmosphere. The rest green diffusion is just the Rayleigh scattering. This is beautiful but remains me of the space. I didn't smoke anything, but I think microspace and macrospace have many common points...
I hope you will enjoy my photos and sorry for bad language!
Damian
Need another expensive macro lens?
- No!
I got some brilliant idea. In oldschool photography it is said that making high resolution macro photos is possible with regular lenses also. All it need to be done is just to reverse the lens. In normal conditions focal plane is closer to the lenses that an object. In macrophotography it is different. Focal point of an image lies further from the lense than an object itself. So after we flip the lens, the light paths remains unaltered by optical aberrations.
Drawback of this method is very shallow depth of image. Only fraction of milimeter in depth will be sharp becouse of very high image scale and fast focal ratio of the lens. What is more, we MUST use the tripod, becouse even small movements of the camera cause blurs. Another issue is lack of light, efen "bright" f/2.8 lens after reversing becomes very dark, becouse focal plane is more than twice longer than normally.
Let's start. This is non cropped photo of the monitor taken normally with the lens in closeup:
we can hardly see some bands from the LCD structure.
And here we go with the lens flip:
also uncropped, we have at least 10x higher image scale!
The last pictures of the poor match. It burns right after that..
This is the example of how shallow image depth is.
Here is the expanding lens of the Firedragon's DPSS module. It is very tiny, has 5mm total outer diameter
we can crop the image to see more on the surface:
It is dual concave and looks good quality.
The focusing lens is a diferent story:
It is non coated, we can see microscratches, microbubbles and dust on its surface. I must replace this lens for better one, maybe I can achieve up to 10% more power?
It's time for main course now!
<500mW firing through the tiny lens:
some particles in the air are heated:
Too far? Want to be closer?
Yes, please.
Even closer.. Some particle is rotating in the beam like an asteroid in the sun light..
pin-point focus of the laser beam. Don't know what is the diameter but it is in 1/10 of mm range. Third particle from the left is like the meteor burning in the Earth's atmosphere. The rest green diffusion is just the Rayleigh scattering. This is beautiful but remains me of the space. I didn't smoke anything, but I think microspace and macrospace have many common points...
I hope you will enjoy my photos and sorry for bad language!
Damian
