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7/01/2010

Telrad 4 inch Riser and Bob's Knobs on XX14i

The Telrad, the 4 inch riser and the Telrad base.




















Well, I got two more packages in the mail. The first I'll review and wish I had known this a LONG time ago. I would have purchased a riser a long time ago. See I was once under the impression that the base of the Telrad sat on the top of the 4 inch riser and that the 4 inch riser had its own base. Nope, Nope, Nope! The Telrad base is put on the scope and then the riser fits onto the base, and the Telrad firmly attaches to the top of the rise. This means you can swap the Riser between scopes. Dumb, should have figured that one out on my own, but I post it here since life is truly a learning experience so I share with you my learning experience. It's okay to snicker and laugh if you want, I laughed at myself bringing in my son and daughter wanting to know what I was laughing at.

Anyway, here are some images:



Top of the Telrad (i.e. the Telrad) and the top of the 4 inch riser.





















The bottom of the riser fitting onto the base of the Telrad.






















The 4 inch riser going onto the Telrad's base.




















First image with a ruler. The Telrad attached to the four inch riser results in just over 9 inches of height as shown here and in the next image.
























I'm not going to figure the actual calculation on the ruler, you can do that if you want (I'm lazy, been teaching since last August and I'm finally done until mid to late August after tomorrow so no more mental calculations for now).




















Bottom line this is HUGE with the riser. I haven't mounted it on the XX14i yet because where I would like to mount it, I don't think I can. Right next to the finder scope would be nice but the truss screw on for one of the poles is there and I fear it is going to interfere with that vital action. The left side opposite the finder will work so I"ll just have to take some bungee cords and try out a few locations. Steve Coe said I may want it mounted on the side near the bottom. If you have advice or opinions I would love to hear them in a comment!

Some may question why put a Telrad on this since it has the intelliscope. I'll use the intelliscope no problem. Yet as I've stated, I am a star hopper and I love hunting them down, that is part of the run for me. So a Telrad will go on and with the riser because I'm tired of cranking my neck into weird positions. I tried it out tonight and it worked really nice. Should have spent the $19 a LONG time ago!


The next package were my Bob's Knobs. They were in a set of three which is common and are stainless steel I believe with black knobs. Per the site, I ordered the one for the Meade Lightbridge. Instructions are basic and offer tips if you haven't done this before.























Installing is easy. If you have done this you use the Allen Wrench you use to collimate to take one screw out at a time, and then put in a knob. The knob and the screw (yes, they is a difference here of that much).




















Okay, over at Cloudy Nights a member mentioned about the Bob's Knobs resulting in a loose secondary, and he went back to the original screws. What I discovered is that on the secondary holder are three small, round metal ends and the Bob's Knobs need to line up on them. When lined up, everything is fine. I fear that the CN member means in the field when one goes to collimate the knob loosens and thus the secondary isn't firm. So I am going to see if that is the case when I do the collimation. I'll also ensure I keep the knobs on the metal pads. We'll see and I'll share that info in my next observing report.





This image is blurry, sorry, but you can see the metal that the screw touches here (I withdrew the screw).






















Here is a clearer picture of the knobs and the screws touch the metal circles so you can't see them.




















A different angle:




















I truly like using these to collimate and hope they work out. In case they don't I'll take the Allen Wrench and the original screws to swap them out. Still waiting for the clouds and the wind to subside to take it out! Going to try the intelliscope feature in the house per this comment from Steve over at Cloudy Nights:

"I haven't had any issues with my XX14i other than some az encoder spacing issues at the time I assembled it, I recommend checking the spacing by referring to the Intelliscope manual under the "hidden functions" heading. You can check just about everything that might be an issue using the built-in trouble-shooting, and you can do it with just the lower tube set on the base while it's in the house, garage or wherever. Personally I really like the COL, it's accurate and dependable in my experience." Quote at this link on Cloudy Nights, 14th post down if I counted correctly.

So, that's all I got done tonight along with a run to gas up my car and get some stuff for dinner.
Here are the review of my purchases and as always, they will be followed with a first light. First the Telrad riser. 9 and 1/4 est. inches is very high but in every position I put the Telrad and Riser on the upper tube, the riser made it so much easier to view. I also tried it on the XT10 and WOW!!!! Heaven. No more sitting on the ground to view, no more contorted positions to view. Easy to view, easy to see. I have no regrets on getting the four inch over the two.

Bob's Knobs. The jury is out on these. I need to watch to make sure they aren't grooving or causing the secondary to be loose. If needed I will go back to the originals and sell these at cost to someone in SLAS or local who would like to own them. I have a gut feeling that they will work though they may need a washer and that would be fine. Pretty excited is insufficient on my actual excitement level to get out and view this. I may try to snag a few Herschels on Saturday but will try it out at the Star Party on some of the brighter Messiers to see how it goes. Clear skies to you!