andrew s

Yes because the object distance is, in this case, very much greater than the telescope focal length so the image distance is, to good approximation, at the focal point. It is not generally true. Regards Andrew

That's because they are at very different distances. Basic geometric optics has the linear magnification as image size/ object size = image distance / object distance (to a good approximation in this case) . The image size maybe the same but the magnification is different in the two cases. Regards Andrew

Notwithstanding this comment, a telescope produces a real image on the imaging sensor and in so doing you can define a linear magnification. Given the distance of astronomical targets it is very much less than one! Take the moon with a diameter of about 3500km, it can be projected to about a 1cm image by a telescope, a magnification of about 3 x10^-5! (assuming I did the sums right). The longer the focal length the less the demagnification. Regards Andrew

I am delighted to say FLO, as one would expect, have stepped up to the plate and are resolving the issues forthwith. Excellent customer focus. Regards Andrew

Thanks, I have asked you , via email, about the self and counterweight shaft clamp. Thank you for your response to my post and glad you will be updating your information. Regards Andrew

Thanks, I know that now but it is not clear that is the case from the product descriptions, at least as they were when I ordered the mount and components. . Regards Andrew

Indeed they are, certainly not before another £25 ka-ching. I have to say I am unimpressed with that and it not being clear if you need the counter weight clamp or not. I am not sure if it is FLO or Rowan who are to blame. While the fit and finish is good the extras to make the mount work are not obvious. It has taken the shine of getting it somewhat. Regards Andrew PS actually I am quite cross for the cost of the encoders and DSC to make the mounting plate an extra is outrageous. In addition it is shown mounted in the advertising. Also the list of commonly bought with items shows the counterweight bar without clamp. Ok rant over.

Yes too much excitement. Ordered the counterweight bar without clamp as I did not realise it screwed into the clamp or dovetail bar. Back to FLO for a clamp. Also no mounting plate for the DCS not sure about that. Regards Andrew

What could this be? Regards Andrew

There is also the issue of not vignetting the light path. Regards Andrew

Do you know why? I can't think of an obvious reason. Regards Andrew

Yes but that's because you are comparing different focal lengths. Regards Andrew

No it's a function of magnification, as far a I know. Regards Andrew

Happy to accept the your filters prefer different exit pupil sizes thought I can't think of a reason why off hand. Also happy to accept the wider the field you want then for a given aperture fast F ration is better given 2" eyepiece constraints. I am sure not why the longer fl eyepiece does not darken the sky background they same if the magnification is the same as we were discussing. Regards Andrew

It's swings and roundabouts as a faster scope has greater field curvature, needs higher quality with shorter length eyepiece for high magnification. Unless you are going to extremes I don't see much in it optically. Regards Andrew

But, what if you used a 43mm eyepiece (assuming I did the sums right) with the F/9 to match the magnification? Regards Andrew

Hi @Bigfoot 9907 I have had this occasionally when my ASI 1600 mm was too hot and could not regulate to the set temperature. May be a red herring. Regards Andrew

Lighter weight and more compact. On the down side stresses the eyepiece more as it presents more oblique rays to it. Regards Andrew

A planetarium program should use your Lat Long and height wrt sea level in its calculations. Regards Andrew

Yes

I think you will have to measure it. You could use a spirit level and a sighting arrangement with a protractor. Then use a planetarium program to see the altitude of the plants relative e to your measured horizon. Regards Andrew PS or the high tech method just posted 🙄 it's an age thing.

I wonder what route they will take. Software engineering is a whole different undertaking to mechanics. Regards Andrew

Still waiting to join the club. Ordered from FLO, chanting mantras as I wait. Regards Andrew

Don't forget to play the Firebird by Stravinsky at the official opening. Regards Andrew

I like it when I can stop cutting the grass. I would say lawn but that would imply a degree of perfection it lacks. Regards Andrew