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08-20-2018, 09:22 AM   #31
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QuoteOriginally posted by boriscleto Quote
I hope you're getting more use out of the 300/4 than I am of the 150-500...
I've been using it a lot lately mostly to get to know it and how I should best use it. I liked my old Super Takumar 300mm F/4 but that one I mostly either used at infinity, or tried, and failed, to take bird pictures with it. I bought it mostly for astro but the next time I head up to my lake property I will probably take it out and chase the loons and redwing black birds with it.

---------- Post added 08-20-18 at 09:34 AM ----------

QuoteOriginally posted by csa Quote
I don't know if there's a non-macro version. I know mine is clearly marked "Macro" Here's mine:

Sigma 300mm F4 APO Lens Reviews - Sigma Lenses - Pentax Lens Review Database
That is the one I have as well but it isn't labeled macro, but it is the same close focus one that gives the 1:3 magnification.

08-22-2018, 03:49 AM   #32
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So I finally got to do some real astrophotography with this lens. So far it seems like a good performer. I finally got a fairly clear sky last night (boo work night) and even though it was still smokey out I only lost about 1.5 stops when taking a moon picture instead of the 6.5 stops I did on saturday. This gave me hope that I might be able to capture M51. I did and while not the best (far too few exposures) I clearly captured it and things worked pretty well even wide open. Also it appears that astro tracer works just fine when going after DSOs.

ISO 800

What is more impressive is that this was captured with a 3/4 moon from the park in my backyard which is a high 8 on the bortle scale shortly after sunset as I came in at 9:15, and with still visible haze from the smoke.

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