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DENK "BINOTRON" - FIRST LIGHT

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#76 DixonAgee

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Posted 26 April 2013 - 03:32 PM

Eric -

You are not alone. I've been patiently waiting since January 18th. Just ordered the wrong extra bits, I guess.

- Bruce

#77 beatlejuice

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Posted 26 April 2013 - 04:23 PM

Jan 15 for me Bruce, with no extra bits, just 'bare bones'.
Thats all I could afford.
Eric

#78 DixonAgee

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Posted 26 April 2013 - 04:39 PM

Ouch! :foreheadslap: You ought to check the status with an email or call.

Clear Skies

- Bruce

#79 beatlejuice

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Posted 26 April 2013 - 04:46 PM

I'm going to give him a couple of weeks to recover from NEAF and then make a polite call.

Eric

#80 johnnyha

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Posted 27 April 2013 - 01:55 AM

Jeff - I was able to reach focus with the barlow switch only and no OCS in my FS152, using my 2" Zeiss prism diagonal. The 4.5" drawtube of my FT3545 focuser was almost all the way out. The image looked nice on Saturn in average/below average seeing, and I tried it on the almost full moon and there were absolutely no internal reflections, the image was fantastic - but this was using 40* eyepieces, the 18mm Hutech HC orthos. I did not get a chance to try it with a larger AFOV. I would say the image was actually less than 2X though.

Using the OCS at the recommended position on the front of the diagonal I was only able to get the low and medium power settings, there was actually not enough out-focus to reach the highest power setting - but it was very close. I think if I use a 2" mirror diagonal instead of the 2" prism I may get all three powers to focus w/o an extension. I didn't get a chance to try my 2" AP Maxbright though.

Attaching the OCS to the nosepiece of the binos there was not enough in-focus, I was only able to get the high and medium settings.

The interesting thing was that the OCS in front of the diagonal gave me too much backfocus (or in-focus) - I would require an extension to get the high power, at least with the prism diagonal. It was awful close though.

As I said the seeing was average but I was again impressed with how bright and contrasty the images were with a nice neutral tone. And again these Bino27's are amazingly light and simple to use. I am so glad too they have the easy collimation feature, when properly collimated they are so utterly comfortable to use with absolutely no eye strain. If they ever do get knocked out of collimation again by a long eyepiece barrel or whatever, it's nice to know I can reset them in minutes.

#81 junomike

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Posted 27 April 2013 - 08:27 AM

The interesting thing was that the OCS in front of the diagonal gave me too much backfocus (or in-focus) - I would require an extension to get the high power, at least with the prism diagonal. It was awful close though.



I went through this as well, but with the EarthWin system on my AT111EDT. Same Issue though, not enough out travel in the "Barlow" position. If I used an extension (on the eyepiece side), the the Reducer mode didn't have enough in travel to reach focus.

What eventually worked for me was the use the OCS in the Diagonal, but placed into a 2" extension and then into the scope. With that configuration all three magnifications worked.


Mike

#82 Jeff B

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Posted 27 April 2013 - 12:31 PM

Excellent Johnny.

At his request, I sent my new powerswitch back to Russ for evaluation. He just dropped me a note saying sure enough there was a problem with the barlow lens being cocked a tiny bit in its holder. He fixed it, tested it and sent it back already. Should have it on Monday. That's real customer service!

I'm really happy with the binotron. Can't wait to try out my new dovetail diagonal.

I bet you can get to all three positions using the AP diagonal.

Jeff

#83 johnnyha

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Posted 28 April 2013 - 05:56 AM

Russ is amazingly quick with the repairs! Glad you got that sorted out Jeff. Yep I'm real happy with my B27 so far, what a gorgeous piece of kit all around.

#84 johnnyha

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Posted 01 May 2013 - 04:13 PM

Here's a photo of the B27's by the way...

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#85 johnnyha

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Posted 01 May 2013 - 04:14 PM

And what the heck one more...

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#86 johnnyha

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Posted 02 May 2013 - 11:15 PM

Well I got a chance to try out the B27s with the Maxbright diagonal and as any mathlete could have guessed, I was unable to achieve focus at highest power and in fact barely got it at middle power. I got it wrong - I need more backfocus. [EDIT: :foreheadslap: I actually meant LESS backfocus, or more out-travel]. So I'll order part SR from Russ which is the OCS he makes for the Maxbright diagonal to use with refractors, to achieve focus at all three powers of the Powerswitch.

#87 HowardK

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Posted 03 May 2013 - 04:28 AM

I would think that those collimating collars are eating up back focus

Nice though to be able to focus each ep on the fly though those collars look really high needing more back focus again

Thoughts Johnny?

#88 Jeff B

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Posted 03 May 2013 - 08:46 AM

Yes, the collimating collars do add about 12mm to the light path and gave me a problem using the Binotron sans OCS with one of my bino-friendly refractors.

My solution was Russ's new diagonal with the circular dovetail that lets you attach the viewer directly to the top of the diagonal body. It "gives back" or shortens the diagonal light path about 30-35MM.

I'll post pictures shortly.

Johnny, PM me as I've a spare SR.

Jeff

#89 johnnyha

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Posted 03 May 2013 - 11:26 AM

I would think that those collimating collars are eating up back focus

Nice though to be able to focus each ep on the fly though those collars look really high needing more back focus again

Thoughts Johnny?

When using the OCS/Powerswitch combination with my refractor I actually have a little too much out-focus, so I don't see the collimating collars as an issue. Plus you need a certain amount of length to the eyepiece holders anyway so the barrels can clear the prisms, I think the actual collimating mechanism isn't adding much if anything to the overall length.

As I noted earlier though, if the barrels are really long like my KK orthos and 13T6s then they will need to be parfocalized a bit shorter so as not to interfere with the collimating mechanism.

#90 HowardK

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Posted 03 May 2013 - 11:29 AM

Yes ...the dovetail connector is a lifesaver...but too difficult with mine to loosen and rotate the position of the binos...so i had PRECISE PARTS make a T2 male connector on a dovetail connector ....... with a BAADER T2 bayonet attached...means the dovetail stays put in my DENK POWERSWITCH and i just loosen the bayonet thumbscrew to rotate the binos

#91 johnnyha

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Posted 07 May 2013 - 06:48 PM

Received my "Part SR" from Jeff B today in excellent condition, AND got my T2 connecter from Precise Parts which would allow me to connect my 1.25" Baader/Zeiss T2 Prism directly to the B27s a la the MkV for 1X viewing with my FS152.

And of course we have rain in the forecast!

#92 denis0007dl

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Posted 07 May 2013 - 09:02 PM

Received my "Part SR" from Jeff B today in excellent condition, AND got my T2 connecter from Precise Parts which would allow me to connect my 1.25" Baader/Zeiss T2 Prism directly to the B27s a la the MkV for 1X viewing with my FS152.

And of course we have rain in the forecast!


We hope clear night soon :)

#93 Jeff B

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Posted 07 May 2013 - 09:26 PM

Yes ...the dovetail connector is a lifesaver...but too difficult with mine to loosen and rotate the position of the binos...so i had PRECISE PARTS make a T2 male connector on a dovetail connector ....... with a BAADER T2 bayonet attached...means the dovetail stays put in my DENK POWERSWITCH and i just loosen the bayonet thumbscrew to rotate the binos


Can you post pictures of this assembly?

#94 johnnyha

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Posted 08 May 2013 - 01:30 PM

Aha! I just realized the T2-07 change ring/dovetail, will attach to my new Precise Parts adapter and allow my Denk27s to not only be attached directly to my Baader/Zeiss T2 prism diagonal, but also to rotate just like the MkVs. Sweet. Here is the Precise Parts Adapter, which is B27/Denk on one side and T2 female on the other...

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#95 johnnyha

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Posted 08 May 2013 - 01:49 PM

...and here is the adapter with the T2-07 change ring/dovetail. This will screw onto the nose of the B27's with or without the PowerXSwitch and allow me to attach the 1.25" prism diagonal (or 1.7X Newtonian Corrector) directly to the B27s a la the MkV's.

I will probably use this sparingly if at all though as I'm not really excited about removing and attaching the PowerSwitch too often. But it does give me the capability to reach 1X in my refractor and to use the MkV prism diagonal.

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#96 HowardK

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Posted 08 May 2013 - 03:53 PM

Gotta love Ashley at precise arts

#97 HowardK

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Posted 08 May 2013 - 03:54 PM

PRECISE PARTS






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