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Subject: Digiscoping with Olymplus EM-1 and 25mm f1.8 [Print This Page]

Author: cwchan Time: 4/04/2014 17:24 Subject: Digiscoping with Olymplus EM-1 and 25mm f1.8

Tried it out today at Shing Mun Valley Park.

The M.zuiko 25mm f1.8 lens is an internal focus lens. It has nothing move externally. I just join the DCA to the 46mm thread of the lens, then use it, very simple. The automatic focus is very fast.

Author: passerby-b Time: 4/04/2014 21:32

I am considering a SW ATX spotting scope. It seems that you are using one of them.
Could you please tell me if the TLS APO adaptor could use a telephoto set up like the one you use in this post?
Thank you very much!

Author: cwchan Time: 4/04/2014 23:02

B Gor,

My monoscope is the old model ATS 80 HD. The one that you mentioned are the new model ATX 85 and ATX95. The TLS-apo adaptor is a tailor-made objective for this new scope. I have no experience of using it.
TLS-apo + ATX should give very good result, however, you have to focus manually. One more point to note, some digiscoper told me that TLS-apo could not produce full image on APS-C camera but with vignetting. You have to check it out if this is an issue to you.

CW

Author: passerby-b Time: 5/04/2014 22:01

after reading some information on the web, I still do not understand the difference between the TLS APO and DCB II.
It seems that TLS APO will couple with DSLR camera that make the ATX become a telephoto lens. The DCB II couples with a DC "afoucally" so that the whole ATX with the Objective and Eyepiece combination becomes an lens with much longer effective focal length. The DCB II is what I want (I already have a 800mm lens and require a system with longer effective focual length, say, 2000mm or more).
However, some information on the web says that the TLS APO could also combine with mirrorless camera. I am very interest in this.
Just do not know where in HK I could see demo to answer my questions!
Vignetting is a common problem for afocual systems and it could solve easily by using the right combination of eyepieces and camera lenses.

[ Last edited by passerby-b at 5/04/2014 22:03 ]

Author: scchu Time: 18/06/2014 21:22

Quote:

Original posted by passerby-b at 5/04/2014 22:01
after reading some information on the web, I still do not understand the difference between the TLS APO and DCB II.
It seems that TLS APO will couple with DSLR camera that make the ATX become a teleph ...

Take a look this video for setup the APO:
http://v.youku.com/v_show/id_XNDcxMjU2ODUy.html

Author: scchu Time: 21/06/2014 16:12

Quote:

Original posted by cwchan at 4/04/2014 17:24
Tried it out today at Shing Mun Valley Park.

The M.zuiko 25mm f1.8 lens is an internal focus lens. It has nothing move externally. I just join the DCA to the 46mm thread of the lens, then use it, ve ...

請教一下, 你用的目鏡是多少倍?

Author: cwchan Time: 24/08/2014 15:54

My eyepiece is a 30X fixed one.

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