Posts Made By: Donald Durbin

Hi Philip,

I was waiting to see if anyone else was going to respond to your post. You have some very nice equipment. Some of us wish we had your problems.

Please let us know if you do see any difference in color between the prism diagonal and the mirror diagonal. My gut feeling is that you will not but I would like to hear what you discover.

thanks,
Don Durbin

Shay,

First, I consider vignetting to be greatly over rated, especially for binoviewing in astronomy. Your interest is on the object centered in the FOV, not the edges of the FOV.

The answer to your question is no. The 22mm Panoptic has a field stop of 25mm. The clear aperture of a Burgess BV125 is 21mm at best.

Also the 22mm Panoptic is a dual barrel type EP and weighs almost a pound.

The 19mm Panoptic with a field stop of 21.3mm and a weight of 6.6 Oz. is a much better choice for the BV125C.

Don Durbin

2. Siebert 22mm BN image attached

Buck,

Try it without the extension first. Do not use any OCA/OCS, especially if you are doing terrestrial viewing.

If you have a Denk make sure you remove the PowerSwitch. That will give you an additional 13mm of in-travel.

Don

Hi Alan,

I am not sure how much inside focus travel the NSV gives you. I do know that using a 2" diagonal will eat up a bit if it.

Putting a 1 1/4" nose on your Denk and using a 1 1/4" diagonal will buy you some additional focus travel. Also if you have a powerswitch on your Denk you should remove it. The power switch eats up another 13mm of in-travel.

I would think that the NSV should focus without any problem. I know I can focus my Denks in my FS-128 using a Lumicon Lumibrite 1 1/4" diagonal, but it is a little close. If I forget and leave the powerswitch on some EP pairs will not come to focus.

Don

Hi Guy,

Denkmeier makes a version of the PowerSwitch diagonal that does this. It is the R2 version.

I have one of the S1 versions of the PowerSwitch diagonal. It was designed for use with single EPs. I did not like the focal reducer in it so I changed it out for another magnification power.

I then found a used single arm PowerSwitch and I can use it with my modified PowerSwitch diagonal. In an SCT this gives me six working magnifications.

I have also found that I can stack the single arm PowerSwitch on top of a Sieberts standard PowerWheel for single EPs. This gave me six powers in an SCT. It also gave me six powers in a Celestron 102 Wide Field Refractor. The lowest of which probably would not reach focus for astronomy, but worked great for terrestrial viewing. The Celestron 102 Wide Field does not have a great amount of in-travel. With my FS-128 I am pretty sure I could get six powers but I do not remember if I tried that yet. I think that setup would also work in a reflector, but you would probably only get five powers.

Don Durbin

Hi Floyd,

Do you have a small refractor you can try it on for terrestrial viewing?

Don

Pietro,

The more advanced Optical Correction Systems/Adapters use a focal reducer in back of the Barlow element to reduce magnification. You will also need a 1 1/4" extension tube approx 1" long to separate the two elements.

You can find this item on the internet.

Don

Dennis,

At the very least, you will need to use a Barlow to reach focus. You need to overcome the 4 inches of light path that the binoviewer adds.

The WO Binoviewer is advertised to come with:

"Barlow nosepiece (1.6x) for easier focusing with most telescopes!"

Even with this device you may need to add a 1 1/4" barrel in between the binoviewer and the nosepiece element to achieve focus. You might also be able to find a Barlow that you can replace the Barlow element with the WO element.

Siebert also makes an OCA for the WO binoviewer.

Don Durbin

Hi Charles,

Yeah you missed it. Its all over. We have all gone back to Cyclops mode.

Just kidding, there just has not been anything new in a while.

Don Durbin