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<p>[QUOTE=&quot;Clawcoins, post: 3192345, member: 77814&quot;]with the winter coming one of the most noticeable set of stars out there is Orion.&nbsp; In it there are several Nebulae such as M42, M78 and the horsehead &amp; flame.</p><p><a href="https://flic.kr/p/yx84Pt" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://flic.kr/p/yx84Pt" rel="nofollow"><img src="https://farm6.staticflickr.com/5621/21355606581_6a11c3c6c8.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" />20150912_OrionNebulae3-01</a> by , on Flickr</p><p><br /></p><p>in relation to the imaging circle .... it&#039;s basically for DX.&nbsp; FX has a dark ring around it.&nbsp; I was searching for my 40k high airplane at 4,000mm that clearly shows the dark ring around it but I can&#039;t find it right now.</p><p><br /></p><p>as to DSLR, MIrrorless and the cooled cameras such as converted Nikon D5x00s.&nbsp;&nbsp; DSLR has a mirror slap.&nbsp; In my scopes and tests I&#039;ve found I need a 5 second pause before initiating the sensor to eliminate all motion.&nbsp; This is being super critical as in deep space you may end up cropping alot and I have tests showing this the best pause time.&nbsp; Thus you need Bulb mode.&nbsp; Some lower end Nikons have a pause which I think only is 3 seconds - not enough time in my book.</p><p><br /></p><p>Mirrorless.&nbsp; No mirror slap.&nbsp; Modern recent mirrorless at crop and FullFrame are fine for astrophotography.&nbsp; Some older SONYs have a software fiasco nicknamed &quot;star eater&quot; - very appropriately named.&nbsp; So make sure any used one&#039;s software doesn&#039;t do that.</p><p><br /></p><p>Once you get above 20 minutes and you consistently do that you maybe should look at cooled cameras.&nbsp; The sensor gets really hot and you start getting pixels getting burnt out, and thus dead pixels.&nbsp; The cooled cameras allow the sensor to stay cool and prevent overheating.&nbsp; but conversely, by that time you have a really nice telescope and higher end computerized tracking system.[/QUOTE]</p><p><br /></p>

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