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Astrophotography

M45 with Orion 8 inch F3.9
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It looks good though
 
- Steve
 
 
 
Sent: Wednesday, November 01, 2017 2:57 PM
Subject: M45 with Orion 8 inch F3.9 <<$183950678279$>>
 
I have a 75 minute, 800 ISO (3min x 25) of M45 taken with my new 8 in F3.9 Orion Astrograph and a modified Canon D450 at Okie Tex.
You can tell how badly it needs a coma corrector (by the edges) which I have now . Also, the collimation was set using a laser collimator which is not good enough. You can tell by the fat stars on the left side and thinner stars on the right. I did do a defocused star test and you could see the primary mirror still need tweaking. It is not off by much.

I do like the star spikes caused by the secondary mirror holder.

Dave Eisfeldt
Attachment(s):
-m45_10-17_800iso_75_min_Okie_Tex_Orion_8_in_F3_9_no_coma_cor.jpg (1.9 MB)
Well done Dave! I like the star spikes too. If and when I get my C1100/LX850 working again I plan to find a way to install wires on four sides of the Hyperstar to get the spikes. 

Jeff

On Wed, Nov 1, 2017 at 2:57 PM, Astrophotography <astrophotography@centexastronomy.org> wrote:
I have a 75 minute, 800 ISO (3min x 25) of M45 taken with my new 8 in F3.9 Orion Astrograph and a modified Canon D450 at Okie Tex.
You can tell how badly it needs a coma corrector (by the edges) which I have now . Also, the collimation was set using a laser collimator which is not good enough. You can tell by the fat stars on the left side and thinner stars on the right. I did do a defocused star test and you could see the primary mirror still need tweaking. It is not off by much.

I do like the star spikes caused by the secondary mirror holder.

Dave Eisfeldt
Attachment(s):
-m45_10-17_800iso_75_min_Okie_Tex_Orion_8_in_F3_9_no_coma_cor.jpg (1.9 MB)

I have a 75 minute, 800 ISO (3min x 25) of M45 taken with my new 8 in F3.9 Orion Astrograph and a modified Canon D450 at Okie Tex.
You can tell how badly it needs a coma corrector (by the edges) which I have now . Also, the collimation was set using a laser collimator which is not good enough. You can tell by the fat stars on the left side and thinner stars on the right. I did do a defocused star test and you could see the primary mirror still need tweaking. It is not off by much.

I do like the star spikes caused by the secondary mirror holder.

Dave Eisfeldt
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