Mine is a Sigma 300mm F2.8 EX APO in Pentax KAF mount. It's the last of
their film lenses in that focal length, before they reformulated for
digital. It has a detachable lens hood that reverses when it's in its
case. Measuring across the outside of the lens hood it's 129mm.
The Astrozap 124mm-130mm fits snugly over the end of the lens hood. I
barely need to tighten the three thumb screws to keep it in place.
Measuring outside to outside of the front element is 115 mm, so it looks
like the hood adds 14 mm. I was able to buy from a local camera dealer
& actually verify it fit when I purchased it.
The Pentax Forums specs for the SMC Pentax-FA* 300mm F2.8 ED[IF] says it
can take 112mm screw on filters on the front and gives a Diam x Length =
123 x 247 mm. So, I'm thinking the outside of the lens hood is 123mm.
The AZ-1514 I bought might fit loosely or you might need to go with the
next size smaller - AZ-1513 117mm-124mm (4-5/8 to 4-7/8) diameter to get
a snug fit.
The page I linked before has the full line of Astrozap filters.
On 7/13/2017 16:34, Gonz wrote:
John, I'm thinking of getting this too. Is yours for the A *300/2.8?
Thats what I'm going to use and haven't had a chance to measure the
outside diameter of the lens end.
On Tue, Jul 11, 2017 at 11:02 PM, John <sesso...@earthlink.net> wrote:
On 7/11/2017 21:54, Mark Roberts wrote:
I expect there will be more than a few of us attempting to photograph
the eclipse next month. I've just started a little research into it
and I'm closing in on a decision as to what filter to use. My longest
lens is my FA*300/2.8 and it's happily configured with an in-lens 43mm
filter capability. Here's what I've found that looks most promising:
https://www.optcorp.com/spectrum-threaded-camera-solar-filter-43mm.html
Anyone have any experience or other recommendations?
I've talked to several people who photographed previous eclipses and was
told not to use the internal filters because the lens will concentrate
enough light to melt them & besides messing up the filter it can damage
the lens & the sensor. One of my sources stated he had found out the
hard way.
I got an Astrozap AZ-1514 Full Aperture Glass Solar filter that fits
over the lens hood on my 300/2.8 - "Full Aperture Glass Solar Filter
124mm-130mm (4-7/8 to 5-1/8) diameter."
https://www.astrozap.com/scripts/prodList.asp?idCategory=36
I tried it out at GFM. It worked just fine, but I'm still learning how
to aim the camera. I should measure the lens hood diameter on my
80-200/2.8 Tokina ATX-Pro and order a filter for it.
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