Was hoping to use the lens at around f2 - 2.8.
The main light pollution I have in my area is the glow from the city which give my images a yellowish tinge. I live in a Bortle 6 zone.
Just an idea. Would I be better off astro modding my 1200D and keep that as my dedicated portable astro camera that way I can still use my 700D for everyday photography? The only issue with that is I am not confident enough to mod the camera myself and the services I found nationwide are no less than $500 which doesn't seem like it's worth it as I am not out every night taking photos.
I was considering a cooled OSC but the purpose of this setup is to be very portable (DSLR and batteries) and I have no intention of adding an autoguider yet.
Quote:
Originally Posted by JA
The Samyang 135mm f/2 is a very sharp lens, even wide open at f/2, but does get some 5-10% sharper at f/4 so the size of any front mounted filter could be reduced somewhat, if you for instance did not want to shoot wide open at f/2. Do you have any preference for how you'd like to use the lens: Wide open or stopped down? If it's wide open you probably only have one type of front mounted filter available to you, possibly only in a couple of sizes 77mm or 72mm with a step down ring that shouldn't vignette. If stopped down there are some other types available or possibly just lower cost options you could try.
With anything related to light pollution it may not be that easy to say this type of filter is better than that, especially when you're talking about an UNMODIFIED DSLR, since it too will have its own built UV-IR filter built in over the sensor and in Canon's case that will typically allow for no more than ~25% transmission of Hydrogen Alpha. The trick is of course to get rid of everything else that isn't the true sky. That is possible to an extent if your light pollution is from Sodium Type Street lighting. If it's LED based or more broad band light pollution, it can be reduced somewhat, but nothing like what's possible for results with simple filters designed to deal with Sodium Based street lightning.
So that begs the question: What type of light pollution do you have that you want to deal with?
Best
JA
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