Phenix 150mm F5 refractor

[laser_jock99]

Pictures of cheap refractor I picked up once for £100. Mounted on my new EQ6. It's a fast scope & okay for visual but the chromatic abberation is no good for photo work.

[John]

Nice looking scope. I didn't know Phenix did a 6" F/5. CA is bound to be prominent in a large aperture, fast achromat but I'll bet it's a really nice low power, "rich field" scope for visual use

[laser_jock99]

Nice looking scope. I didn't know Phenix did a 6" F/5. CA is bound to be prominent in a large aperture, fast achromat but I'll bet it's a really nice low power, "rich field" scope for visual use

Okay for low power visual use - okay with my OWL 50mm 2" eyepiece.

[E621Keith]

Nice looking scope and a great buy at £100.

Have you consider doing narrow band imaging with it? From what I understand that will eliminate the problem of CA.

[John]

Okay for low power visual use - okay with my OWL 50mm 2" eyepiece.

Wow - a 10mm exit pupil

Your iris must dilate a lot more than mine does

[E621Keith]

Oversize exit pupil is ok on a refractor. You don't get the central black out like a Newtonian, you just won't take advantage of all the light gathered.

[michael.h.f.wilkinson]

With that exit pupil, and assuming a 7mm pupil in your eye, you are losing 50% of the light, effectively turning a 6" F/5 into a 4.2" F/7. CA should be reduced. A Skywatcher Nirvana 28mm would be a very good match to that scope.

[laser_jock99]

Nice looking scope and a great buy at £100.

Have you consider doing narrow band imaging with it? From what I understand that will eliminate the problem of CA.

Yes - it's something I'm dabbling with. I think the optics might just be too poor though, I'm still getting bloated stars.

Sample 7nm narrow band image- low down, through light polluted skies. Picked up plenty of HA through the orange haze but couldn't get any sharpness. Not really a fair test, extreme conditions really, could have been a lot of 'twinkling' at that altitude.