Search found 370 matches

by krakatoa1883
Sun Sep 30, 2018 3:12 pm
Forum: This is SolarChat !!
Topic: Impact of telescope height on the seeing
Replies: 18
Views: 1061

Re: Impact of telescope height on the seeing

Very interesting Christian. I suppose height is relative to the ground on which the telescope rests, irrespective if the ground is at sea level or 2000 m a.s.l., am I right ? (anyway I would expect a generally better seeing at 2000 m...)
by krakatoa1883
Sun Sep 30, 2018 3:04 pm
Forum: Solar Scope Modifications
Topic: Blocking Filter, Mini ERFs and Alternatives
Replies: 176
Views: 6636

Re: Blocking Filter, Mini ERFs and Alternatives

It was mounted just in front of a Powermate in my 150mm refractor. As I said above it was a cold winter day so it doesn't seem unlikely that it broke by a thermal shock. The filter I am now using is this https://www.baader-planetarium.com/en/baader-h-alpha-35nm-ccd-filter.html however for some unkno...
by krakatoa1883
Sun Sep 30, 2018 10:05 am
Forum: Solar Scope Modifications
Topic: Blocking Filter, Mini ERFs and Alternatives
Replies: 176
Views: 6636

Re: Blocking Filter, Mini ERFs and Alternatives

Yes, Christian, it was a red CCD filter, I removed the telecentric from my Quark and was experimenting some different solutions (which all proved to work better...) the filter was mounted just before an amplifier with my 150 mm achromat reduced to 110 mm i,e, @ f/6.8. The mistake was to mount the fi...
by krakatoa1883
Sun Sep 30, 2018 6:53 am
Forum: Solar Scope Modifications
Topic: Blocking Filter, Mini ERFs and Alternatives
Replies: 176
Views: 6636

Re: Blocking Filter, Mini ERFs and Alternatives

MalVeauX wrote:
Sun Sep 30, 2018 12:25 am
Do you guys think a Baader Red CCD Filter (IR block) would be ok with a 6 inch refractor?
I broke one just few months ago. Probably the fault is mine, may be the filter was too close to focus, however since then I make use of a H alpha CCD filter instead, no problems at all.
by krakatoa1883
Sat Sep 29, 2018 7:21 pm
Forum: This is SolarChat !!
Topic: Boring Sun
Replies: 11
Views: 508

Re: Boring Sun

This is the original BF composed by a blue thick glass and a clear thin one, I suppose a KG3 or something like that bf.jpg they were glued but after about one year the glue became degraded and fissured although I have always been careful not to use the device with apertures greater than 80mm without...
by krakatoa1883
Sat Sep 29, 2018 2:41 pm
Forum: This is SolarChat !!
Topic: Boring Sun
Replies: 11
Views: 508

Re: Boring Sun

Thank Franco, very kind :)
by krakatoa1883
Sat Sep 29, 2018 12:01 pm
Forum: This is SolarChat !!
Topic: Boring Sun
Replies: 11
Views: 508

Re: Boring Sun

Thanks! Look at today's hedge on the SE limb if you can.

EDIT: I mean this one
hedge.jpg
hedge.jpg (7.19 KiB) Viewed 441 times
by krakatoa1883
Sat Sep 29, 2018 11:58 am
Forum: This is SolarChat !!
Topic: Lunchtime Sun
Replies: 5
Views: 300

Re: Lunchtime Sun

Great images, Stu, in spite of the low activity.

Today there is a fine hedge on the SE limb, it's worth a look.
by krakatoa1883
Sat Sep 29, 2018 11:48 am
Forum: SPoD Archive
Topic: Boring Sun
Replies: 5
Views: 285

Re: Boring Sun

wow... thanks Mark :D
by krakatoa1883
Fri Sep 28, 2018 8:36 pm
Forum: This is SolarChat !!
Topic: Boring Sun
Replies: 11
Views: 508

Re: Boring Sun

Thanks Stu. Today's page of Spaceweather.com has an interesting article on some consequences of this solar minimum, it's worth a reading. Apollo, yes calcium Quark is heat tunable however the bandpass is large (5A) therefore tuning has only a limited effect. Tried to stack it with a Omega Optical Ca...
by krakatoa1883
Fri Sep 28, 2018 8:36 pm
Forum: SPoD Archive
Topic: Boring Sun
Replies: 5
Views: 285

Re: Boring Sun

Thanks Stu. Today's page of Spaceweather.com has an interesting article on some consequences of this solar minimum, it's worth a reading. Apollo, yes calcium Quark is heat tunable however the bandpass is large (5A) therefore tuning has only a limited effect. Tried to stack it with a Omega Optical Ca...
by krakatoa1883
Fri Sep 28, 2018 7:03 pm
Forum: This is SolarChat !!
Topic: Boring Sun
Replies: 11
Views: 508

Boring Sun

I prepared all my solar toys this morning only to discover later that there were really few details to image. I started with some granulation in K line but I soon give up as eventually I didn't see any sense in this, particularly after Christian showed us his results :lol: So, only a full disc, some...
by krakatoa1883
Fri Sep 28, 2018 7:03 pm
Forum: SPoD Archive
Topic: Boring Sun
Replies: 5
Views: 285

Boring Sun

I prepared all my solar toys this morning only to discover later that there were really few details to image. I started with some granulation in K line but I soon give up as eventually I didn't see any sense in this, particularly after Christian showed us his results :lol: So, only a full disc, some...
by krakatoa1883
Fri Sep 28, 2018 4:04 pm
Forum: Solar Scope Modifications
Topic: Narrowest 393.37 ever by Apollo Lasky
Replies: 117
Views: 10450

Re: Narrowest 393.37 ever by Apollo Lasky

A giant step forward, Apollo, congratulations. Does a telecentric beam make some difference ?
by krakatoa1883
Mon Sep 24, 2018 7:13 pm
Forum: This is SolarChat !!
Topic: Granulation - Surface Texture
Replies: 8
Views: 393

Re: Granulation - Surface Texture

Stu, which filter have you used ?
by krakatoa1883
Mon Sep 24, 2018 2:12 pm
Forum: This is SolarChat !!
Topic: Sunday Sunshine - 23rd september
Replies: 10
Views: 521

Re: Sunday Sunshine - 23rd september

Great calcium images, Mark! many details on the disc and on the limb too
by krakatoa1883
Mon Sep 24, 2018 12:52 pm
Forum: This is SolarChat !!
Topic: Sol from the 22nd of September 2018.
Replies: 8
Views: 392

Re: Sol from the 22nd of September 2018.

Nice set of images, Eric. Which mount are you using there ?
by krakatoa1883
Sat Sep 22, 2018 7:49 pm
Forum: This is SolarChat !!
Topic: Return of the SPOD
Replies: 17
Views: 745

Re: Return of the SPOD

It would be great, Mark. May I suggest to add a link to the collection of all SPODs once published.
by krakatoa1883
Fri Sep 21, 2018 10:27 am
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Experimenting calcium imaging with small refractors
Replies: 28
Views: 2017

Re: Experimenting calcium imaging with small refractors

Very informative table. Looking at the spot diagrams for the g-line (light blue) it seems that only few of the objectives are fairly corrected for this wavelength (calcium H and K lines should give even worse results) but of course some are better than others. Note that semi-apo designs are not much...
by krakatoa1883
Thu Sep 20, 2018 8:04 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Experimenting calcium imaging with small refractors
Replies: 28
Views: 2017

Re: Experimenting calcium imaging with small refractors

Peter made some excellent images using a 115mm triplet, may be with optics similar to Tecnosky apo but I am not sure. I had this triplet in its first version with a different focuser but same objective and I remember it was really good. At the time I was not interested in calcium imaging but I am no...
by krakatoa1883
Thu Sep 20, 2018 2:30 pm
Forum: This is SolarChat !!
Topic: Sept 16th Sun and Yard Views
Replies: 11
Views: 485

Re: Sept 16th Sun and Yard Views

Nice set o images and beautiful colors in your yard!
by krakatoa1883
Thu Sep 20, 2018 7:31 am
Forum: This is SolarChat !!
Topic: Sol in CaK from the 14th and in Ha from the 16th of September 2018.
Replies: 9
Views: 507

Re: Sol in CaK from the 14th and in Ha from the 16th of September 2018.

Beautiful, Eric, that snake on the right side is impressive!
by krakatoa1883
Thu Sep 20, 2018 7:30 am
Forum: This is SolarChat !!
Topic: Exploding arch prom from 9/19
Replies: 16
Views: 808

Re: Exploding arch prom from 9/19

Impressive, well captured!
by krakatoa1883
Thu Sep 20, 2018 7:30 am
Forum: SPoD Archive
Topic: Exploding arch prom from 9/19
Replies: 12
Views: 507

Re: Exploding arch prom from 9/19

Impressive, well captured!
by krakatoa1883
Wed Sep 19, 2018 7:56 pm
Forum: Commercial Solar Filters/Cameras/Hardware
Topic: Experimenting calcium imaging with small refractors
Replies: 28
Views: 2017

Re: Experimenting calcium imaging with small refractors

Fine images, Pedro. Your image with the TMB80 F/11.7 is quite good and is representative of the resolution that can actuallly be reached with a 80 mm in Ca K. On my side, I had found that the (old) Taka FSQ 106 was good when stopped down to 80 mm. thanks Christian, I had an excellent sample of Sky 9...