Wow Factor

I've had a Denk binoviewer for some time now. It has become one of those accessories relegated to a shelf in the garage. The biggest reason for that is not being able to bring the darn thing to focus with either my Tak TOA130 or my Mewlon 250. Last night at a star party I decided to do whatever it takes to get the darn thing to work. Firstly, I was never able to bring it to focus with a diagonal on my Mewlon. Finally, I tried it without the diagonal and was able to bring it to focus on M13. All I can say is wow. That thing is a jewel. Now I need to do it with a diagonal because straight through viewing leave my neck in a wrench. I know I need some accessory to allow focusing, but I don't know what it is. There just doesn't seem to be enough infocus with the TOA130 or the Mewlon. What the heck do I need to make this thing work with a diagonal?

Louis,

First try different EPs. The further out an EP focuses in your refractor, the less in focus travel it will need in the binoviewer.

You can probably come to focus using a Barlow, but the magnification may be too high. You can try putting the Barlow directly on the Denk for the least amount of magnification or in front of the diagonal which will result in more magnification.

Does your Denk have a 2" nose or a 1 1/4" nose or do you have both? A 1 1/4" nose can be used with a 1 1/4" diagonal and needs less in-travel. You can buy a 1 1/4" nose for your Denk. They are not expensive.

Denk also makes adapters to focus your binoviewer in about any scope or you can post a want ad for either a 2" or a 1 1/4" Denk OCS designed to work with your particular scope.

Finally you can try building your own OCA.

http://www.astromart.com/forums/viewpost.asp?forum_post_id=313188&poll_id=&news_id=&page=

Good Luck
Don Durbin