Search found 602 matches

by Rusted
Fri Oct 16, 2020 10:57 am
Forum: This is SolarChat !!
Topic: 16.10.20 AR2776 in dire seeing conditions.
Replies: 18
Views: 422

16.10.20 AR2776 in dire seeing conditions.

Glassy, wobbling, shaking, going in and out of focus.
I feel so shamed to share these. :D

16.10.20 11.00 BF1200 2.6x GPC bw 2.jpg
16.10.20 11.00 BF1200 2.6x GPC bw 2.jpg (93.83 KiB) Viewed 422 times
16.10.20 11.12 BF1200 2.6x GPC bw 2.jpg
16.10.20 11.12 BF1200 2.6x GPC bw 2.jpg (97.82 KiB) Viewed 422 times
BTW: With a 2.6x GPC on the '174 camera nose the etalon distance to focus was 23.5cm.
by Rusted
Thu Oct 15, 2020 3:14 pm
Forum: Solar Scope Modifications
Topic: Basic question about PST etalon to focus spacing.
Replies: 39
Views: 1314

Re: Basic question about PST etalon to focus spacing.

How do you focus the camera in the 'second' new arrangement? The 200mm you have labelled up isn't going to be 200mm in reality as you're using a glasspath, it will be greater as it throws the focus further. The focusing eyepiece holder + tromboning the camera's T2-1.25" adapter will have to cope fo...
by Rusted
Thu Oct 15, 2020 5:32 am
Forum: This is SolarChat !!
Topic: AR2776 new one! UPDATE to Animation
Replies: 16
Views: 432

Re: AR2776 new one!

Beautifully captured! :bow

This one looks promising!

"Give me sunshine.. tra-la-la!" :D
by Rusted
Thu Oct 15, 2020 5:18 am
Forum: Solar Scope Modifications
Topic: Basic question about PST etalon to focus spacing.
Replies: 39
Views: 1314

Re: Basic question about PST etalon to focus spacing.

I use a 1.6x, 2x and 2.6x TS GPCs. Only one at a time. These are 1.25" diameter, compact, fairly inexpensive and meant for binoviewers. P1440040 rsz 600 gpcs txt.jpg Overall variation of focus point, compared to no GPC at all, is less than 18mm or 3/4". My 2" SVBony helical focuser could easily mana...
by Rusted
Wed Oct 14, 2020 7:44 pm
Forum: Solar Scope Modifications
Topic: Basic question about PST etalon to focus spacing.
Replies: 39
Views: 1314

Re: Basic question about PST etalon to focus spacing.

I routinely use a rotating T2 adjuster to hold the camera's T2-1.25". This allows me some leeway in achieving camera focus. T2 helical focuser.jpg I have another TS T2 helical focuser but the driving pin fell out! Perhaps a drop of red Loctite would hold the pin in? :D ts-T2 non-rotating-helical-foc...
by Rusted
Wed Oct 14, 2020 6:14 pm
Forum: Solar Scope Modifications
Topic: Basic question about PST etalon to focus spacing.
Replies: 39
Views: 1314

Re: Basic question about PST etalon to focus spacing.

Any image amplification should be going after the blocking filter and before the camera so won't affect the blocking filter performance. How is your scope setup Rusted? Thanks Mark. Ironically, I have just invested in a "normal" focuser for the first time on my H-alpha 150/10. My 2" helical focuser...
by Rusted
Wed Oct 14, 2020 2:49 pm
Forum: Solar Scope Modifications
Topic: Basic question about PST etalon to focus spacing.
Replies: 39
Views: 1314

Re: Basic question about PST etalon to focus spacing.

Thanks to all who responded. :bow The PST BF and ITF are obviously sized for their position in the original PST f/10 beam. So moving them away from focus may cause problems. I have this vague memory of the PST BF and ITF working by multiple reflection.[Like the etalon] So they may well be optimised ...
by Rusted
Mon Oct 12, 2020 5:44 am
Forum: This is SolarChat !!
Topic: AR2774 and AR2775 H-alpha
Replies: 11
Views: 319

Re: AR2774 and AR2775 H-alpha

Excellent detail and close-up too! :bow
by Rusted
Mon Oct 12, 2020 5:39 am
Forum: This is SolarChat !!
Topic: Sol from the 11th of October 2020.
Replies: 10
Views: 265

Re: Sol from the 11th of October 2020.

Nicely crisp images! :bow There is a vaguely similar naming problem when saving JPEGS from TIFs. Most of the name is stripped away once JPEG is selected as the image file type. So I have to Copy the full name before and Paste it in after I have changed to JPEG. Though this can hardly be called a cor...
by Rusted
Sun Oct 11, 2020 6:07 pm
Forum: Solar Scope Modifications
Topic: Basic question about PST etalon to focus spacing.
Replies: 39
Views: 1314

Re: Basic question about PST etalon to focus spacing.

Thanks Rusted, that is all very clear. However, when I add a Barlow I just refocus with the telescopes focuser and it all seems OK? Also, I tried measuring 200mm but it doesn't seem to matter where I put it as I can just focus with the telescope focuser anywhere. So I have no idea where 200mm is? A...
by Rusted
Sun Oct 11, 2020 9:33 am
Forum: This is SolarChat !!
Topic: 10.10.2020 Worst seeing ever!
Replies: 8
Views: 249

Re: 10.10.2020 Worst seeing ever!

marktownley wrote:
Sun Oct 11, 2020 7:49 am
Good result for bad seeing, you're back in a northwesterly airflow like us?
Thanks Mark. :bow

No, we are still in a south westerly flow. Cold at 50F and windy again! :cry:
by Rusted
Sun Oct 11, 2020 9:31 am
Forum: This is SolarChat !!
Topic: 10.10.2020 Worst seeing ever!
Replies: 8
Views: 249

Re: 10.10.2020 Worst seeing ever!

yltansg wrote:
Sun Oct 11, 2020 6:21 am
Well done, Rusted getting a nice image despite such adverse circumstances.

What was your setup?

Alfred
Thanks Alfred. :bow

My setup is in my signature down below.
by Rusted
Sun Oct 11, 2020 5:56 am
Forum: This is SolarChat !!
Topic: 10.10.2020 Worst seeing ever!
Replies: 8
Views: 249

10.10.2020 Worst seeing ever!

Hi,

Fighting cloud, wind and awful transparency.
It was difficult to find the sharpest focus!

10.10.20 11.50 b1200 2.6x gpc bw 2.jpg
10.10.20 11.50 b1200 2.6x gpc bw 2.jpg (84.03 KiB) Viewed 249 times
by Rusted
Sat Oct 10, 2020 8:07 pm
Forum: Solar Scope Modifications
Topic: Basic question about PST etalon to focus spacing.
Replies: 39
Views: 1314

Re: Basic question about PST etalon to focus spacing.

Hi Alexandra, Our modified PST telescopes are based on the same geometry as the little PST but usually made much larger in scale . The little PST objective lens is an f/10. So we aim for f/10 in our enlarged objectives. The entire PST is designed around the geometry of its f/10 objective. If our big...
by Rusted
Sat Oct 10, 2020 12:46 pm
Forum: Solar Scope Modifications
Topic: Basic question about PST etalon to focus spacing.
Replies: 39
Views: 1314

Re: Basic question about PST etalon to focus spacing.

Sorry Mark. I was probably too keen to agree with what I thought you had written. To avoid any further confusion: The etalon spacing is fixed at 200mm from the focal plane . BUT NOT a fixed distance from the telescope objective. The position of the focal plane changes with each change of GPC. So, wi...
by Rusted
Sat Oct 10, 2020 6:56 am
Forum: Solar Scope Modifications
Topic: Basic question about PST etalon to focus spacing.
Replies: 39
Views: 1314

Re: Basic question about PST etalon to focus spacing.

Thank you Mark! :bow This is precisely the information I needed to confirm my own fuzzy thoughts on the matter. :bow2 While moving various components around in the filter stack I noticed the discrepancy in increased spacing with different GPCs. It has been staring me in the face for ages and I never...
by Rusted
Sat Oct 10, 2020 6:34 am
Forum: This is SolarChat !!
Topic: 4.10.20 Belated images of AR2773 near the limb.
Replies: 7
Views: 206

Re: 4.10.20 Belated images of AR2773 near the limb.

Thank you all for your encouragement. :bow

I have been "playing" with my PST etalon to focus spacing.
It provides a surprisingly different presentation compared to having it slightly too long. :o
I have asked questions about this in the Modification Forum.
by Rusted
Fri Oct 09, 2020 8:30 pm
Forum: Solar Scope Modifications
Topic: Basic question about PST etalon to focus spacing.
Replies: 39
Views: 1314

Basic question about PST etalon to focus spacing.

Hi, I am trying to get my head around my use of several different GPCs used as [single] Barlows. When there is no GPC/Barlow involved the focal plane and PST etalon are spaced at 200mm. BUT: What spacing is required when a GPC or Barlow are added in front of the camera? The focal plane is thrown fur...
by Rusted
Fri Oct 09, 2020 1:48 pm
Forum: This is SolarChat !!
Topic: Is this a pore?...H-alpha 10-8-20
Replies: 10
Views: 400

Re: Is this a pore?...H-alpha 10-8-20

Starry Jack wrote:
Fri Oct 09, 2020 1:40 pm
Thanks Rusted and Valery.

Rusted, looks like you caught my feature for sure. Near the limb but I always get befuddled with orientation since it changes with each configuration of lenses I put in. :lol:

Jack
Left of centre, low in the southern, solar hemisphere. :D
by Rusted
Fri Oct 09, 2020 11:43 am
Forum: This is SolarChat !!
Topic: 4.10.20 Belated images of AR2773 near the limb.
Replies: 7
Views: 206

4.10.20 Belated images of AR2773 near the limb.

It is very quiet so I am sharing some [rather poor] images of AR2773 as it approached the limb on the 4th and 5th in poor seeing. We have had a run of cloud and/or rain since then. 4.10.20 15.24 B1200 2x GPC bw.jpg 4.10.20 15.24 B1200 2x GPC col.jpg 5.10.20 10.15 b1200 2x GPC bw.jpg 5.10.20 10.15 b1...
by Rusted
Fri Oct 09, 2020 5:32 am
Forum: This is SolarChat !!
Topic: Is this a pore?...H-alpha 10-8-20
Replies: 10
Views: 400

Re: Is this a pore?...H-alpha 10-8-20

A fascinating image with fine detail! :bow Possibly a curved filament? Is this the correct image orientation Jack? It looks like the south west quadrant from the limb darkening to lower right. I might just have a brief, early window today within several days of cloud and rain. I'd hate to miss your ...
by Rusted
Sun Oct 04, 2020 12:23 pm
Forum: This is SolarChat !!
Topic: AR2773 10/01/2020 with fantastic filament
Replies: 19
Views: 533

Re: AR2773 10/01/2020 with fantastic filament

:bow :bow :bow Absolutely gorgeous detail and processing! :bow :bow :bow
by Rusted
Sun Oct 04, 2020 12:18 pm
Forum: SPoD Archive
Topic: Full disk 01.10.2020
Replies: 8
Views: 249

Re: Full disk 01.10.2020

Very crisp images! :bow

They look good enough to eat! :D
by Rusted
Fri Oct 02, 2020 1:48 pm
Forum: Sunlit Earth
Topic: Harvest Moon 1st October 2020
Replies: 13
Views: 437

Re: Harvest Moon 1st October 2020

Excellent images. :bow

Though the first appears to have a rust problem.
Nothing a drop of WD40 won't cure. ;)