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Your most used focal length range for A.P.?

astrophotography imaging refractor
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#1 Eric H

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Posted 14 August 2019 - 02:00 PM

OK, Astrophotography and refractor peeps. What is your most used focal length range?



#2 Ballyhoo

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Posted 14 August 2019 - 03:38 PM

I am guessing the sweet-spot is 500mm to 600mm of course responses will vary but that will cover most diffuse nebula, like NGC 7000. for galaxies the sweet-spot is a lit higher. 



#3 HydrogenAlpha

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Posted 14 August 2019 - 11:03 PM

Depends on your chip size too. I'm running my setup at 585mm with an APS-H. Previously I was going at 450mm with an MFT sensor, which gives roughly the same fov.

#4 NikhilJoshi

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Posted 22 August 2019 - 02:45 PM

TEC-140 with AP QuadTCC. 700mm at f/5. KAF-8300 chip gives about 1.5deg FOV.


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#5 knight_parn

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Posted 22 August 2019 - 03:06 PM

For me it's between 450mm and 700mm, f/4.9 and f/6.5. I'm using an APS-C DSLR.


Edited by knight_parn, 22 August 2019 - 03:07 PM.

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#6 Eric H

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Posted 22 August 2019 - 03:26 PM

So far it seems a lot of widefield imaging.



#7 Hesiod

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Posted 22 August 2019 - 05:33 PM

200mm (from this spring 300mm): at such short focals can avoid the guide, the goto, and in general term any kind of hassle; also, can keep the weight at minimum.

Being free from hassles and diminutive in sizes is for me of paramount importance since I am for the most a "visual" stargazer and take pictures while observing (and, obviously, do not want to waste my time  fighting with electronic crap), to find some comfort when bad weather hits for too many days


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#8 OldManSky

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Posted 22 August 2019 - 06:04 PM

So far it seems a lot of widefield imaging.

I spent a lot of my early years in astrophotography doing narrow-field.  Going after small galaxies and PNs with long focal-length (and usually slow) instruments.  SCTs, VC-200Ls, big Newts, etc.  It was challenging, and now and then rewarding.

At this point, I prefer wide-field imaging.  Putting some of the smaller stuff in context in the sky.  Seeing the swirling clouds of faint nebulosity around the brighter targets.  Fields full of colorful stars.  Wonderful.

I still appreciate those narrow-field, well-done galaxy shots, PN shots, etc.  But I've found my home -- and it's between 135 and 650mm FL. :)


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#9 Kevin_A

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Posted 22 August 2019 - 06:23 PM

I like 600mm to 900mm as it gives me more sensor filling targets with APS-C or fullframe cameras.

Its all a matter of preference...


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#10 zjc26138

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Posted 23 August 2019 - 06:35 AM

I'm at 910mm with my TMB130SS. Used with both a APS-C and Full-Frame sensors.


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#11 hfjacinto

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Posted 23 August 2019 - 07:30 AM

Depends on the target. I have ~380, ~900 and ~1200.
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#12 DeanS

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Posted 23 August 2019 - 09:55 AM

Tak FS60 with reducer   252mm

 

Tak E160 F/3.3  525mm

 

AP130 820mm

 

TEC160  1120mm

 

AGO newt   1235mm

 

AGO iDK     1700+mm

 

My most used that gives me the best results under about any sky conditions is the E160.  I always said if I could only keep one imaging scope it would be this.  But that was before theAP130 and TEC160 arrived, would be harder choice now.

 

Dean


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#13 Esso2112

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Posted 23 August 2019 - 10:40 PM

Most used would be 1218mm with a Tak FS-152 @ ff8. 

 

Second place would be 560mm with a Tak FCT-125 @ f4.5


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#14 psandelle

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Posted 23 August 2019 - 11:29 PM

352mm

 

420mm

 

600mm

 

900mm

 

1200mm

 

Really depends on the target. Right now I’m doing a lot of 352, but that will change. Lower FL is more forgiving, so one probably sees more of that, but once the wrinkles in a rig are worked out, it depends on the tRget.

 

Paul


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#15 balu01

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Posted 24 August 2019 - 02:00 AM

1000 TOA 130 mostly prefer full frame , sometimes the TOA 35 reducer to be able to fit target.

Edited by balu01, 24 August 2019 - 02:02 AM.

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#16 CvBadengoth

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Posted 24 August 2019 - 03:26 AM

quite recently a lot at 1200mm, hunting galaxies most of the time in APSC format (ASI071)...


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