Guidescope Suitability Calculator

[Stub Mandrel]

On 16/04/2018 at 14:51, FLO said:

Currently there is no explanatory text, we will add that when enough people have kicked it's tyres  

No 0.9x option for Barlow/Reducer - that's the Skywatcher Coma Corrector lots of us use with the 130P-DS so ought to be there.

Minor point 130P on list but 130P-DS isn't (although both have same aperture f/l).

[Skipper Billy]

2 hours ago, Stub Mandrel said:

Hopefully I've found it - backlash compensation was switched off

What's backlash ??? 😉 (Mesu owner 😉 )

[old_eyes]

Easy to use. Plugged in my numbers and instantly got ratio of 1:1.6. So, reassuring. Plugged in some ofther scopes I have or might use and generally found I am OK.

[old_eyes]

19 hours ago, Skipper Billy said:

What's backlash ??? 😉 (Mesu owner 😉 )

There is such a thing as smug you know!

[ollypenrice]

3 hours ago, old_eyes said:

There is such a thing as smug you know!

It's something you can easily catch when you buy a Mesu. I've bought two. Uh-oh!!

Olly

[ollypenrice]

10 minutes ago, KevS said:

Posh or what🤣

No, the necessary tools of my trade. I need stuff to work for my guests - though it's nice that it works for me, too!

😁lly

[michael.h.f.wilkinson]

How long does it take for an added scope or camera to appear in the menu. I tried adding my Meade SN-6 Schmidt Newtonian, but it isn't showing yet (or has that feature been switched off).

[FLO]

27 minutes ago, michael.h.f.wilkinson said:

How long does it take for an added scope or camera to appear in the menu. I tried adding my Meade SN-6 Schmidt Newtonian, but it isn't showing yet (or has that feature been switched off).

Sorry about that. I periodically check the database for new entries but confess it has been a while since I last looked. I’ll find some time to review it next week.

Meanwhile you can of course enter your scopes stats manually to check suitability. 

Steve 

[fwm891]

I use a TS Optics 80mm guide scope and ASI120mm camera combo which I switch between scopes. For the f2 RASA I get 1:1.104 ratio, with the Altair 115 EDT APO I get 1:2.04 and the little William ZS 73 +ASI294MC pro and 9x 50mm guider (ASI120mm camera) I get 1:2.06

Great little prog.

Edited January 24, 2020 by fwm891
text added

[Stub Mandrel]

My current guidescope is a 50mm 183mm f/l coated achro lens from Astromedia, in an aluminium body with coarse length adjustment, with a cheap eBay helical focuser, and the lens cell, dewshield and mounting block off a £7 eBay scope.

Gives me a 3:1 ratio and as mentioned above I can guide at 0.6" rms 🙂

[javaruba]

Hi all,

Exceptional calculator!

I have a question. I'm using an OAG and get the following results which is 1:0.81. If I put Binning to 2x2 on the guide camera I get a ratio of 1:1.62. Which would be a better, with or without binning the guide camera?

Results without guide came binning

Results with guide cam binning

[Stub Mandrel]

20 hours ago, javaruba said:

Exceptional calculator!

I have a question. I'm using an OAG and get the following results which is 1:0.81. If I put Binning to 2x2 on the guide camera I get a ratio of 1:1.62. Which would be a better, with or without binning the guide camera?

I'd be tempted to bin, with an OAG and narrow field of view you may struggle to get something bright enough to use as a guide star.

But try both and see what works best.