I have been plowing through the forum here of topics on 92TCC/Stowaway, and I have come across a few more posts relating to tilt: (1) On 10/26/2021, Roland replied in a thread: "It is possible for the

Hello Roland, Yes, the thumb screws holding the TCC in the DOVELOC are indeed pointed. In fact, they are so pointed that they make small marks on the TCC itself. See photos attached. I guess this

If the machinist made your adapter in two setups it will definitely have tilt. You can measure that by using a micrometer and measure 3 points around the length of the adapter. If they vary by .001"

Tilt might be introduced by the three thumb screws. If they have sharp points they may not allow the TCC to seat squarely onto the adapter. We have changed these screws to have flat bottoms which

Henry The 64.1 mm backfocus is dimension X in the sketch below. Mike

The plotted distance from the sensor to the corrector by Roland is 64.1mm. From: main@ap-ug.groups.io <main@ap-ug.groups.io> on behalf of Henry Kwok <henry.ck.kwok@...> Sent: Friday, July 29, 2022

Yeah... I am sure the scope and the 92TCC are not to blame. So it is most likely the custom adaptor which is made locally by a machinist and I am not sure what his precision is. I think I will invest

In either case it is not within the scope nor the corrector themselves. From: main@ap-ug.groups.io <main@ap-ug.groups.io> on behalf of Brian Valente <bvalente@...> Sent: Friday, July 29, 2022 11:02

>>> so presumably the tilt lies with the custom adaptor or the AP92/TCC92 itself? it's also possible it's within the camera/sensor. There's a reason ZWO includes a tilt plate with their cameras (i

That usually suggests tilt is the dominant (but not necessarily the only) source of error. Both of these two issues need to be tackled and solved. That is the beauty of the article Chris wrote, is

Thanks for the link to the article, Bill. Very useful. I have used ASTAP on the images with my AP130 and my AP92. the AP130 has a little aberration and the HFD at the corners are slightly different

Could be slight tilt in your camera or could also be spacing. If the stars in the corner get better when you focus inward, then it suggests adding 1mm of spacing. It means you have inward curvature

Timely post. There is a really, really good write up here about tilt and spacing: Fixing the dreaded tilt and backspacing error in optical systems with objective analysis. - AstroBin A fellow AP fan

Hello, Questions about trying to get good corner stars with my Stowaway + 92TCC. I have been trying to get good corner stars with my Stowaway + 92TCC + APS-C size QHY268m camera. No matter what I

Decades to reach focus for one target. But how much more to reposition for another one? It would need to move about 15.7AU per degree of target angle, at the 900AU radius. Chip

IIRC, there’s an astronomer at Columbia University who proposed using the Earth as a refractive lens. He runs the Cool Worlds YouTube channel, but I haven’t kept up with where the idea went.

Is that how it's done? APPM blind solver options are set separately than the solver, and not specific to astap, so i'm not sure -- Brian Brian Valente astro portfolio

Tens of kilometers surface resolution! Wow. KJ

https://arxiv.org/abs/2207.03005 A mission architecture to reach and operate at the focal region of the solar gravitational lens Henry Helvajian, Alan Rosenthal, John Poklemba, Thomas A.

I think it something to configure directly in ASTAP... Cheers, Carl