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Want to Try Film at least once... what do I need to know?

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#26 Michael Covington

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Posted 03 May 2019 - 06:28 PM

We still want to know how much difference there is (and what the difference consists of), not merely which one performs better.


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#27 GraySkies

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Posted 03 May 2019 - 09:04 PM

So I looked at Stellarium tonight forward to the start of June... possible three targets :

RedC51:

Blue Horsehead Nebula (IC 4592) & IC4601

 

North American Nebula (NGC 7000) and Pelican Nebula (IC 5070)

ZS80:
 

Andromeda Galaxy (M31) with M110 and M32

If I went with the SCT I could go for smaller targets but it will be at f/10 which is pretty slow... and I'm not as familiar with the Northern Summer Sky as I am with the Winter.


Edited by GraySkies, 03 May 2019 - 09:06 PM.

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#28 Michael Covington

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Posted 03 May 2019 - 09:54 PM

You need a low f-ratio and bright objects.  What is the exact film?  Kodak Ektar?  Ektar has good hydrogen-alpha response; some other color films don't.



#29 Michael Covington

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Posted 03 May 2019 - 09:55 PM

Amateurs did not photograph galaxies through telescopes until CCDs came along.  I'm not kidding.  Well, a few pioneers with cooled-emulsion cameras did...



#30 TOMDEY

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Posted 04 May 2019 - 12:07 AM

Amateurs did not photograph galaxies through telescopes until CCDs came along.  I'm not kidding.  Well, a few pioneers with cooled-emulsion cameras did...

Ahhh... yes! The cold cam (was that Jack Newton?!) There were a few of us die-hards. Actually grateful when the weather was sub-zero (F!) Then two continuous hours of hand-guiding, then straight to the dark room... and then the hour drive into Rochester. I'd arrive at work at 6am, sitting at my desk, bleary-eyed, gripping a hot cup of coffee, with my frost-bitten fingers, negative in the other fist. Thankfully, my employer was Eastman Kodak --- they understood, encouraged, and even rewarded the obsession.

 

Here's a later picture, from when EK TP2415 film had arrived on the scene. Galaxies were my favorites... and still are!  Tom

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#31 Michael Covington

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Posted 04 May 2019 - 10:55 AM

I wonder if I corresponded with you at Kodak when I was doing some of my early writing... I was certainly in touch with them regularly.



#32 TOMDEY

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Posted 04 May 2019 - 11:25 AM

I wonder if I corresponded with you at Kodak when I was doing some of my early writing... I was certainly in touch with them regularly.

Hi, Michael; not sure; it's "all a blur"  I was with B&L from 1968-1980+ (some of that overseas for Uncle Sam) then Kodak after that. I was working Government Projects; was not directly involved in film. I do remember admiring the glass emulsion plates, including the 14x14-inchers for the Palomar Schmidts! My understanding is that some (small) % of those would spontaneously rupture/explode in the stressed plate-holders?! There's a LOT of energy stored in a flat plate puckered to a spherical mandrel ! Those chipped windshield commercials remind me of that, to this day. All it takes is one little undetected scratch, crack or chip and BLAMMO!    Tom


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#33 Michael Covington

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Posted 06 May 2019 - 11:18 PM

Is this the film the OP wants to use?  It has a nice peak at 656 nm, good for hydrogen nebulae.
https://imaging.koda..._portra_400.pdf




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