Hi this is graham from Jenham's Astro. A little while ago i made a video comparing these two
scopes the skymax 127 and the celestron c90 and i expected the skymax to produce a significantly
better result than the smaller scope. I was looking at Jupiter at the time and i didn't
really see a huge amount of difference. Now in the intervening period i have spent more time
using the 127 and i have begun to see that it can deliver better results than the small Mak
but now we've got another opportunity to do a back-to-back comparison
so now i'm going to look at Mars. Mars is about a month past opposition it's
high in the sky in the evening and it's probably the last point for me when it presents a tempting
target so let's get the two scopes rigged up we're going to compare like for like so the same mount
same barlow same ADC and same night and let's see what difference that bit of aperture makes.
So following the process i have in my other recent mars videos i'm using
fire capture and i'm capturing the data in raw to save space on the disk
so this is a section of the video from the c90 so clearly you can see the grid because we're
taking the video now and recording it in raw format so this grid will disappear when we um
process the file and yeah you can already see some detail which i'm quite happy with mars
is about probably 30 degrees above the horizon and the c90 is giving a pretty good view i'd say
and here's the processed image so i've taken it through AutoStackkert
and Registax and that is the result using the c90 25 of 10 000 frames.
And then straight away we've moved on to the the 127 and this is the video using the larger scope
so again you can see a set of detail um on the planet the seeing is reasonably good i'd
say and we're probably only 15 minutes after taking the couple of shots on the
c90
and that's the image using the larger scope so
drum roll i guess we need to compare the two side to side and see if there is an obvious difference
so there you go c90 at the top and the 127 underneath and i think probably as with the
jupiter result slightly more detail with the larger scope but not a huge difference
and then just for a bit of fun uh just to show how quickly mars rotates if you're out about
for a couple of hours i've just got a little video you can see Syrtis Major coming into view
so for me there's not a huge amount of difference the 127 gives slightly more
detail but the c90 equips itself very well so perhaps my c90 is particularly sharp and my 127
is not the absolute best scope but for me the comparison is useful just tells
me that on a bright target the 127 isn't necessarily going to be a completely,
like a game changer compared to the smaller mak so i hope it's been useful um generally i try to do
comparison videos because i know when i'm shopping for scopes i like to see these, if you do,
if you'd like to see videos like this then please press the like button and also subscribe to
Jenham's Astro and hopefully in future you'll see some more comparisons okay hope it's been useful
thanks for watching