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Whats the difference on AT6RC f/9 to f/5.7?

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#1 JoseBorrero

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Posted 07 January 2013 - 09:46 AM

Well, to answer this I shot a 1 single 600secs in Ha Atik 314L+ each setup and overlaped in Registar you judge :)
BTW I used a Meade FR/FF 0.63x . haven't measure my back focus, but theres no ext ring,a FW and ~10mm spacer is on place. Measurement will be later.

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#2 JoseBorrero

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Posted 08 January 2013 - 11:27 PM

no comments, I guess it was an old topic eh?

#3 Ratchet

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Posted 08 January 2013 - 11:55 PM

Looks like the FF/FR worked out pretty well. I can't make out any distortions. Did you apply any flats to these images? I guess with the decent image circle size and small sensor it may not be visually apparent if there was vignetting with the FR.

#4 JoseBorrero

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Posted 09 January 2013 - 12:24 AM

no calibration just a single shot. no cropping, as you can see no vignetting

#5 Ratchet

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Posted 09 January 2013 - 01:05 AM

I've been eying those ATRCs for a while...

Oh the temptation.

#6 orlyandico

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Posted 09 January 2013 - 02:20 AM

but the atik 314 has a tiny chip compared to DSLRs...

#7 Midnight Dan

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Posted 09 January 2013 - 07:28 AM

Hi Jose:

Is this the Meade 0.63x SCT type focal reducer? If so, what adapters did you need? Can you describe your set of adapters, spacers and focal reducers starting from the back of the scope?

Also, as orlyandico mentions, the size of the sensor makes a big difference in how well this works. What is the physical size of the 314 sensor?

Thanks!
-Dan

#8 JoseBorrero

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Posted 09 January 2013 - 08:32 AM

A 2" nosepiece for the focal reducer is available at scope stuff the otherside is sct to m42 adapter very low profile also from scope stuff.

#9 JoseBorrero

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Posted 09 January 2013 - 08:35 AM

I tried with a dslr about less than a year and no vignetting was note it. That was on the dslr forum I post the owl nebula using same setup. I didn't determined the f ratio by that time, now I use pinpoint in maxim.

but the atik 314 has a tiny chip compared to DSLRs...



#10 JoseBorrero

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Posted 09 January 2013 - 11:47 AM

not final but an in comming image i'm working :)

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#11 pfile

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Posted 09 January 2013 - 10:50 PM

I used to use a televue trf-2008 0.8x reducer flattener with my dslr and at6rc. there was definitely vignetting but it was correctable with flats.

#12 JoseBorrero

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Posted 10 January 2013 - 12:01 AM

I believe the trf has corrected curvature for refractors but the meade fr/ff are made for curvatures of sct's and rc's.

here are some comments about the reducer http://www.bhphotovi...3_Focal_Redu...

I used to use a televue trf-2008 0.8x reducer flattener with my dslr and at6rc. there was definitely vignetting but it was correctable with flats.



#13 Ratchet

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Posted 10 January 2013 - 12:22 AM

There has been posts on another forum about mixing flattener types with some surprising results.

Link

#14 JoseBorrero

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Posted 10 January 2013 - 12:31 PM

Thanks ratchet focal reduced experiment are all around, is a good experience when results came as expected. :)

#15 JoseBorrero

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Posted 11 January 2013 - 10:48 AM

the native focal lenght is 1368mm at f/9, with the meade 6.3 fr/ff the focal lenght goes to 942.4mm, that's a 425.6mm reduction.

#16 JoseBorrero

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Posted 12 January 2013 - 05:30 PM

here's another comparison

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#17 JoseBorrero

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Posted 14 January 2013 - 11:51 AM

Here's the working version with FR/FF On, just 8 x 600 secs in Luminance, Hopefully get the rest of the channels later.

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#18 JoseBorrero

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Posted 14 January 2013 - 12:00 PM

here's my attempt of:

Ha: 7 x 600secs
OIII: 12 x 600secs
SII: 13 x 600secs

Atik 314L+ Mono

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#19 Gray

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Posted 17 January 2013 - 01:40 PM

Looks great Jose! Really like M81 image. :waytogo:

#20 JoseBorrero

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Posted 20 January 2013 - 11:29 AM

Thanks Gray,

I just upload this short exposure that Im working with. Too little clear skies these days

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#21 JoseBorrero

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Posted 21 January 2013 - 03:55 PM

Here's my RGB only; 5 x 200secs Version of the Rosette

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#22 JoseBorrero

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Posted 21 January 2013 - 04:31 PM

And of course my blended version of RGBSHO :p

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#23 JoseBorrero

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Posted 08 April 2013 - 08:01 PM

:grin:

#24 Raginar

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Posted 08 April 2013 - 10:07 PM

That's awesome. So RGBSHO? What's that?

#25 zerro1

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Posted 08 April 2013 - 10:13 PM

SII, Ha, OIII






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