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Mr. Starks, I contacted the previous owner, and he too had the same issue with focus, he adjusted the Primary “up” in the collimation bolts such that his bevy of ETHOS eyepieces would come to

I bought my Obsession 18” UC several years ago after the owner had contracted a serious medical condition while he was waiting to receive the scope from Obsession.? He sold me the scope and had

Chuck, I have the same scope as you, Obsession 20” F/5, except that my focal ratio is actually 4.92 and my scope and mirror were made in 1999. I have had them since new. Your focal length is another

The only way your Ostahowski mirror is exponentially worse is if you have it mounted upside down. The diagonal is flat, so there isn’t a multiplying/fudging factor. As you move a secondary closer to

Thank you for your help.? The previous owner contacted me after I had put the scope to bed last night.? He had the same problem, but he said he moved the mirror up via the collimation bolts such

I have had the same problem and it was because the mirror was not seated correctly. I agree with the above comments and would start with adjusting the mirror mount first.

Hi Charles, I agree with the previous answers, depending of the direction where you see you come close to focus, inward or outward, but you do not reach it, you have to move the mirror up if inward,

Yes, he needs to move the primary up, closer to the secondary. I'll bet the collimation bolts are backed way out. Move that mirror up half an inch and see how that works. Get Outlook for

I thought it sounds like he needs to get the primary mirror closer to the secondary...

Greetings from someone from your old stomping grounds. I agree with Mark, back off all the collimation screws/bolts, this positions the primary mirror the farthest from the secondary mirror and re

I had a similar experience once but I found my collimation screws had backed out nearly all the way from extensive travelling/bumpy roads. FYI, the truss poles on my 20" F5 classic are ~65-7/8" with

Read before send. BOLTS, not BOTS.

I would send this email to Dave Kriege.

I've got an 18" classic - you have quite a bit of up-travel on your mirror - run the collimation bots up a bit and see if that give you enough in travel. Just a thought.

I just acquired a 2007 classic Obsession 20" F5.? The scope looks to be in excellent shape.? I assembled the scope being careful to place the strut poles in the blocks according to the previous

Bob , Jeff , and others, Thank you so much for your advice.? I am going to get the tripod ladder first and then will try to get another ladder to steal steps from.? Nobody seems to have tripod

After reading all of this I am very glad that I contacted Tallman ladders 10 years ago or so and was able to order an Astronomy ladder and go pick it up direct from them (only about an hour from me).

I was lucky to get a 2 meter Astronomy ladder in a group buy many years ago. I think my friend with a 25 f/5 got the 2.5mI know someone with a modified ladder. They placed intermediary steps. It is

I drilled through the front and back edge of the channels of the new ladder pretty much matching the intent of the original manufacturing process. ________________________________ Sent: Friday, July

On the donor ladder I just drilled them out. A couple of rivets were a little obstinate. ________________________________ Sent: Friday, July 9, 2021 9:08:17 AM To: [email protected]