Wednesday Solar Action 29-9-21

[xtreemchaos]

very poor seeing here today in south wales so not the best shots by far, 2 smallish AR and a nice run of proms on show.

kit starwave 102 F11, Quark, asi120mc. 

thanks for looking. clear skys. charl.

proms off going limb.

AR2880 BIT Soft with seeing.

AR2876

[Ibbo!]

Nicely done Charl.

[xtreemchaos]

thanks Steve your very kind. there was other proms mate but i give up with the seeing getting worse by the minute, i took the prom shot first which im quite happy with but i could not see the spots on the ARs on the live view  they showed when staxed thankfully. clear skys. charl.

10 minutes ago, Ibbo! said:

Nicely done Charl.

 

[Alan White]

Thanks for sharing, nice to see what's going on today.
No where near a scope, so wonderful to see.

A question for you Charl, is your Quark directly in the 100mm f11 or do you have an ERF out front?
 

[xtreemchaos]

thanks Alan. no ERF on the objective but 2in one on the wedge this is ok upto 120mm scopes some have used this all so on 150mm but i think that 150mm is pushing ones luck. clear skys . charl.

[Rusted]

I use a Baader full aperture D-ERF on my 150/10.
Yesterday I was using some black, camping mattress foam, to measure where the focus was sharpest.
It is much easier to see the sun's disk on smooth, black material. Rather than blindingly bright [or red] on white.

Without the usual "protective" IR/UV blocking filters smoke soon rose from the foam!
The burn left a shiny trail on the foam surface. So much for the Baader D-ERF having a cool beam!

I now use an additional Baader 35nm H-alpha, 2" filter. Plus a Beloptik KG3.
Both are stacked in front of the PST etalon. These really do ensure a cool beam after the D-ERF.

I had the same problem with a burning beam with a 90mm Baader sub aperture D-ERF inside a 150/8.
That mistake cost me a ZWO camera. I would never trust a Baader D-ERF alone to protect a 150mm H-a system.

Try it for yourself. You can instantly burn your hand, or your clothes at focus after a D-ERF.
When it is the only means of protection from a 150mm objective.

I have shiny burns on my black, down jacket. Where the beam accidentally shone on it during adjustment.
It is easy to forget when your are checking focus without the usual optical train.
You glance down to see smoke rising from your clothing!

Let's be careful out there!