Rosette - first light DIY quad acro

[jnp]

Weather was too poor to even attempt guiding with the 8" newt so I had first light with my prototype short focal length 90mm Quadruplet Achromat. I just left it tracking (unguided) for about two hours in patchy cloud and luckily still managed 27min (54 x 30s) of usable subs.

It not that good, but this actually exceeded my very low expectations. I expected more coma and CA. (I think my new BAADER UHC-S filter helped the CA).

A shorter focal length doesn't half make life easier.

thanks for looking

John

[LukeSkywatcher]

Lovely image.

[Glen]

... still managed 27min (54 x 30s) of usable subs.

It not that good...

i would be realy chuffed. Thanks for showing.

Glen

Edit: chuffed = realy happy

[msinclairinork]

This gives me hope incase I never get guiding going! lol

Very nice image! looking forward to having a crack at this one my self.

Thanks for sharing,

Michael

[harry page]

Hi

Good start

I think the background is a little clipped though

Harry

[jnp]

Thanks for the kind feedback. Yes, there's some clipping, but I hope to get more than 27mins next time.

cheers

John

[ollypenrice]

The lens seems to be doing pretty darned well. Have you posted about it anywhere because I am mighty intrigued...?

Olly

[Doc]

Me to John, could you tell us a little more about this Quadruplet Achromat.

Fantastic shot BTW

[jnp]

Olly, Mick - thanks for the interest. I just posted this in DIY

http://stargazerslounge.com/diy-astronomer/130414-diy-quadruplet-achromat.html#post1698486

[michael.h.f.wilkinson]

Nice shot indeed. This does encourage me to try some unguided shots myself (my mount has no guider port (yet)). I have a 400mm F/5.6 Sigma APO telephoto which should be interesting to test on this. Even the 80mm F/6 might track well enough.