Thursday, September 29, 2016

More on Curtis' 12" F4 . . .

Out with the old, in with the new. Here's Curtis' 12" F4 OTA
"before and after". It's considerably lighter. Note the two Losmandy
4" dovetails on either side of the OTA. Curtis will be able to
rotate the OTA 180-degrees for imaging, if needed.

The telescope will be mounted on an German equatorial.

Tuesday, September 27, 2016

A 12" F4 OTA for Curtis.....

The tube components for a 12" F4 OTA. This will be a 6-strut design with two
4" Losmandy-type dovetail plates, one mounted on each side. Here you 

see the mirror cell,  3" focuser and spider mounted Curtis intends 
using the telescope for imaging. Curtis lives in Orange, California.

Saturday, September 24, 2016

16" String-Strut Kit for Grant Complete . . .

Grant's string-strut kit. The only components Grant will need to supply
are the spider, secondary, focuser, primary mirror and cell.

Thursday, September 22, 2016

Grant's 16" Kit Just About Complete . . .

A dual fan assembly for Grant's 16" string-strut kit. With this
component, the kit is 99% completed. 

Wednesday, September 21, 2016

Zac Begins Building His Kit . . .

A neat beginning to building his kit, Zac, in Georgetown, Kentucky, starts by applying some graphics. It'll be interesting to see this telescope come together. Here's what Zac has to say:

"Dennis -- Getting some graphics in, these are rub off letters that i have used on models for years, you place the plastic backing over it and rub three the plastic to apply the letters, they are super thin and will be glossed over and will never come off."

Monday, September 19, 2016

A Couple of Photos and a Note from Wyatt in Dallas . . .

Hi Dennis, Here is my DobStuff XT10 conversion out on my driveway in Dallas for some observation of Jupiter on Saturday morning, December 19. Just average seeing, but I still managed to watch a good part of an Io transit over about an hour with some reasonably clear views throughout the session. The scope is really great to use.

Back when you were doing the build for me, I mentioned that primary mirror cooling was one of my main reasons for doing this. I now run both the mirror cell fan and (don’t laugh…) a second cooling fan as shown in the picture. This homemade implementation – rubber bands and all — works really well. The cooling power is greatly increased and I don’t notice any vibration/image blurring. (I have tested it with the second fan both on and off on during planetary observation like the one from yesterday morning.)

Anyway, FYI and thanks again for the great scope! - Wyatt

A Couple of Projects.....

Grant's 16" telescope project is coming along. Here, Grant has asked
for the "strut rocker box". It lightens the weight and is still very rigid.

A 13.1" 6-point flotation mirror cell for Stephen in Wayland, Massachusetts.

With the adjustable back plate, the mirror cell will easily fit
Stephen's 16" telescope tube.