Finding the subject - ideas needed
Moderators: Chris S., Pau, Beatsy, rjlittlefield, ChrisR
-
- Posts: 724
- Joined: Thu Dec 16, 2010 2:49 pm
- Location: Barcelona, more or less
Re: Finding the subject - ideas needed
In astronomy we use a "flip mirror" which is a folding mirror that would allow you to send the light beam from the side entrance, and remove it to take the photo. I have my flip mirror waiting in the drawer to be mounted. You can also use it to place an eyepiece and observe with your eye what you are going to photograph
https://www.astroshop.es/espejo-plegabl ... s-/p,49764
https://www.astroshop.es/espejo-plegabl ... s-/p,49764
- rjlittlefield
- Site Admin
- Posts: 24209
- Joined: Tue Aug 01, 2006 8:34 am
- Location: Richland, Washington State, USA
- Contact:
Re: Finding the subject - ideas needed
Such a wonderful community! I have these parts on order now.heartprairie wrote: ↑Mon Jan 13, 2025 10:56 amYou can get a beam splitter very cheaply from AliExpress. I have personally used the following parts:
--Rik
- enricosavazzi
- Posts: 1545
- Joined: Sat Nov 21, 2009 2:41 pm
- Location: Västerås, Sweden
- Contact:
Re: Finding the subject - ideas needed
If you are using a microscope, an analog method to shining a laser through the eyepiece of a DSLR is to use an epi-brightfield illuminator. In addition to projecting a light spot onto the subject, when the scope is brought to approximate focus, the liight spot (as visually observed by looking directly at the subject, not through the microscope) becomes smallest and brightest, and afterwards you only need to trim the fine focus. Then you need to switch off the epi illuminator and switch on whatever incident illumination system you use for imaging. As a rule, epi-brightfield produces too flat an illumination to be useful for imaging three-dimensional subjects.
Much the same result can be obtained with an epi-darkfield illuminator and BD objectives equipped with a coaxial illumination sleeve around the objective. In this case the cost is higher because you also need a new set of objectives. At present I am actually experimenting with epi-darkfield and BD objectives to see if the illumination can be made more directional and useful for imaging. The idea is somewhat similar to the filters discussed in the past on PM.net for COL transmitted illumination.
Much the same result can be obtained with an epi-darkfield illuminator and BD objectives equipped with a coaxial illumination sleeve around the objective. In this case the cost is higher because you also need a new set of objectives. At present I am actually experimenting with epi-darkfield and BD objectives to see if the illumination can be made more directional and useful for imaging. The idea is somewhat similar to the filters discussed in the past on PM.net for COL transmitted illumination.
--ES
Re: Finding the subject - ideas needed
I decided to proceed with the purchase of these two products, my problem is that my setup is with SM2 thread, the only adapter I found is SM2 to M42x1. Do you know how much compatibility there is between M42x0.75 and M42x1?heartprairie wrote: ↑Mon Jan 13, 2025 10:56 amYou can get a beam splitter very cheaply from AliExpress. I have personally used the following parts:
"Half Reflection Half Transmission Lens Adapter for Monocular Coaxial Digital Microscope" (i.e. beam splitter)
https://www.aliexpress.com/item/32898574847.html
"Datyson Microscope Photography Accessory 30mm Interface to M42" (for coupling the beam splitter to your tube lens)
https://www.aliexpress.com/item/4001231388266.html
It comes with a standard M26 mount on the front for Mitutoyo-type objectives - the RMS variant just includes an adapter ring. Other types of adapter rings are available elsewhere.
-
- Posts: 65
- Joined: Mon May 27, 2024 4:31 pm
Re: Finding the subject - ideas needed
They're not compatible. You could get SM2 to a larger diameter, then use a stepdown ring.
- rjlittlefield
- Site Admin
- Posts: 24209
- Joined: Tue Aug 01, 2006 8:34 am
- Location: Richland, Washington State, USA
- Contact:
Re: Finding the subject - ideas needed
Perhaps https://www.aliexpress.com/i/2255799868461926.html could help?
"T2-M42 Lens Adapter for T2/ T (M42x0.75) Mount Lens to M42 (M42x1) Screw Mount Camera Body"
--Rik
Re: Finding the subject - ideas needed
Thanks, that's what I need!
Re: Finding the subject - ideas needed
That was too easy. Watch out for the treats, they are calorific!
Re: Finding the subject - ideas needed
This one may be another option
https://www.thorlabs.com/thorproduct.cf ... mber=SM2Y2
https://www.thorlabs.com/thorproduct.cf ... mber=SM2Y2
Re: Finding the subject - ideas needed
Maybe not for low budget affairs.