Night Out of Focus - Blood Moon

Take-5-JB · 01-24-2019, 01:10 PM - **1 Like**

Photolady,

Maybe I'm wrong, but 300mm on APS-C sensor (1.5 to 1 for 35mm) would be 450mm equivalent and a 2x teleconverter would make it 900mm. That came from my comment where I used a 300mm f4 with 2x converter on a K3. Most of my issues came in more than one axis direction, not just forward motion blurring due to lunar advance. It was 28 F and I was in a hoodie with no gloves. Totally ill-prepared, forgetful (64 years old) and not as good of an equipment check as should have done. Took into consideration that f5.6 with 2x would be F11.2, f6.3 = 12.6, etc. I just screwed up. Usually when I use 300mm, 400mm, 500mm, etc with a 2x for the moon my shutter speeds are 150 - 500 and all is well even if I forget the SR is on, but here I was nailed by SR and lunar advancement velocity. Glad no lives depended on my operational prep for this one!!!

JB

photolady95 · 01-24-2019, 06:57 PM - **1 Like**

Originally posted by Take-5-JB

Photolady,

Maybe I'm wrong, but 300mm on APS-C sensor (1.5 to 1 for 35mm) would be 450mm equivalent and a 2x teleconverter would make it 900mm. That came from my comment where I used a 300mm f4 with 2x converter on a K3. Most of my issues came in more than one axis direction, not just forward motion blurring due to lunar advance. It was 28 F and I was in a hoodie with no gloves. Totally ill-prepared, forgetful (64 years old) and not as good of an equipment check as should have done. Took into consideration that f5.6 with 2x would be F11.2, f6.3 = 12.6, etc. I just screwed up. Usually when I use 300mm, 400mm, 500mm, etc with a 2x for the moon my shutter speeds are 150 - 500 and all is well even if I forget the SR is on, but here I was nailed by SR and lunar advancement velocity. Glad no lives depended on my operational prep for this one!!!

JB

300mm x 2 equals 600mm, not 900mm, the equivalent of 1.5 would give 900mm.

**Bob 256** · 01-25-2019, 09:53 AM - **1 Like**

Originally posted by clackers

Your shutter speed was way too slow.

The moon is much faster across the sky than the stars (20 seconds would be fine for them).

??The moon moves almost the same rate as the stars??

**clackers** · 01-25-2019, 10:57 AM - **1 Like**

Originally posted by Bob 256

??The moon moves almost the same rate as the stars??

Yes, it's about 4 percent *slower* as MossyRocks and orhers pointed out to me, Bob.

Last edited by clackers; 01-25-2019 at 12:44 PM.

**jawats** · 01-25-2019, 11:40 AM

Originally posted by clackers

Yes, it's about 4 percent *slower* as MossyRocks pointed out to me, Bob.

Why Do Objects Appear to Move Across the Sky at Night? | Sciencing

Seems a good explanation.

**Bob 256** · 01-25-2019, 05:39 PM - **1 Like**

Originally posted by clackers

Yes, it's about 4 percent *slower* as MossyRocks and orhers pointed out to me, Bob.

Oops - Sorry about that Clackers. I clicked on the thread and think I jumped in at a point earlier on - quite a few posts had been made that I didn't see. Didn't mean to add to those.

I know you can get hit over the head too many times and then start to see stars

**clackers** · 01-26-2019, 12:00 AM - **1 Like**

Originally posted by Bob 256

Oops - Sorry about that Clackers. I clicked on the thread and think I jumped in at a point earlier on - quite a few posts had been made that I didn't see. Didn't mean to add to those.

I know you can get hit over the head too many times and then start to see stars

I'm grateful to everyone to be set right, and glad the thread (which can be googled in the future) contains rich, accurate info.

**jawats** · 01-26-2019, 11:47 AM

Originally posted by clackers

I'm grateful to everyone to be set right, and glad the thread (which can be googled in the future) contains rich, accurate info.

I am as well, Clackers.

Plus, I love starting threads that stir the pot a bit.

It's the lawyer in me.

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01-24-2019, 01:10 PM - 1 Like	#31
Take-5-JB Senior Member Join Date: Jan 2010 Location: South Carolina Posts: 236	Photolady, Maybe I'm wrong, but 300mm on APS-C sensor (1.5 to 1 for 35mm) would be 450mm equivalent and a 2x teleconverter would make it 900mm. That came from my comment where I used a 300mm f4 with 2x converter on a K3. Most of my issues came in more than one axis direction, not just forward motion blurring due to lunar advance. It was 28 F and I was in a hoodie with no gloves. Totally ill-prepared, forgetful (64 years old) and not as good of an equipment check as should have done. Took into consideration that f5.6 with 2x would be F11.2, f6.3 = 12.6, etc. I just screwed up. Usually when I use 300mm, 400mm, 500mm, etc with a 2x for the moon my shutter speeds are 150 - 500 and all is well even if I forget the SR is on, but here I was nailed by SR and lunar advancement velocity. Glad no lives depended on my operational prep for this one!!! JB

01-24-2019, 06:57 PM - 1 Like	#32
photolady95 Otis Memorial Pentaxian Join Date: May 2009 Location: Cruising the forum watching his back Photos: Gallery \| Albums Posts: 12,712	Originally posted by Take-5-JB Photolady, Maybe I'm wrong, but 300mm on APS-C sensor (1.5 to 1 for 35mm) would be 450mm equivalent and a 2x teleconverter would make it 900mm. That came from my comment where I used a 300mm f4 with 2x converter on a K3. Most of my issues came in more than one axis direction, not just forward motion blurring due to lunar advance. It was 28 F and I was in a hoodie with no gloves. Totally ill-prepared, forgetful (64 years old) and not as good of an equipment check as should have done. Took into consideration that f5.6 with 2x would be F11.2, f6.3 = 12.6, etc. I just screwed up. Usually when I use 300mm, 400mm, 500mm, etc with a 2x for the moon my shutter speeds are 150 - 500 and all is well even if I forget the SR is on, but here I was nailed by SR and lunar advancement velocity. Glad no lives depended on my operational prep for this one!!! JB 300mm x 2 equals 600mm, not 900mm, the equivalent of 1.5 would give 900mm.

01-25-2019, 09:53 AM - 1 Like	#33
Bob 256 Site Supporter Join Date: Jun 2008 Location: Idaho Photos: Gallery Posts: 2,375	Originally posted by clackers Your shutter speed was way too slow. The moon is much faster across the sky than the stars (20 seconds would be fine for them). ??The moon moves almost the same rate as the stars??

01-25-2019, 10:57 AM - 1 Like	#34
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by Bob 256 ??The moon moves almost the same rate as the stars?? Yes, it's about 4 percent slower as MossyRocks and orhers pointed out to me, Bob. Last edited by clackers; 01-25-2019 at 12:44 PM.

01-25-2019, 11:40 AM	#35
jawats Site Supporter Join Date: Nov 2017 Photos: Gallery \| Albums Posts: 756 Original Poster	Originally posted by clackers Yes, it's about 4 percent slower as MossyRocks pointed out to me, Bob. Why Do Objects Appear to Move Across the Sky at Night? \| Sciencing Seems a good explanation.

01-25-2019, 05:39 PM - 1 Like	#36
Bob 256 Site Supporter Join Date: Jun 2008 Location: Idaho Photos: Gallery Posts: 2,375	Originally posted by clackers Yes, it's about 4 percent slower as MossyRocks and orhers pointed out to me, Bob. Oops - Sorry about that Clackers. I clicked on the thread and think I jumped in at a point earlier on - quite a few posts had been made that I didn't see. Didn't mean to add to those. I know you can get hit over the head too many times and then start to see stars

01-26-2019, 12:00 AM - 1 Like	#37
clackers Otis Memorial Pentaxian Join Date: Jul 2013 Location: Melbourne Photos: Albums Posts: 16,397	Originally posted by Bob 256 Oops - Sorry about that Clackers. I clicked on the thread and think I jumped in at a point earlier on - quite a few posts had been made that I didn't see. Didn't mean to add to those. I know you can get hit over the head too many times and then start to see stars I'm grateful to everyone to be set right, and glad the thread (which can be googled in the future) contains rich, accurate info.

01-26-2019, 11:47 AM	#38
jawats Site Supporter Join Date: Nov 2017 Photos: Gallery \| Albums Posts: 756 Original Poster	Originally posted by clackers I'm grateful to everyone to be set right, and glad the thread (which can be googled in the future) contains rich, accurate info. I am as well, Clackers. Plus, I love starting threads that stir the pot a bit. It's the lawyer in me.