Thanks John.
On Thu, Jul 13, 2017 at 10:14 PM, John <sesso...@earthlink.net> wrote: > 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. >>> >>> -- >>> Science - Questions we may never find answers for. >>> Religion - Answers we must never question. >>> >>> >>> -- >>> PDML Pentax-Discuss Mail List >>> PDML@pdml.net >>> http://pdml.net/mailman/listinfo/pdml_pdml.net >>> to UNSUBSCRIBE from the PDML, please visit the link directly above and >>> follow the directions. >> >> >> >> > > -- > Science - Questions we may never find answers for. > Religion - Answers we must never question. > > -- > PDML Pentax-Discuss Mail List > PDML@pdml.net > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. -- -- Photography takes an instant out of time, altering life by holding it still. Dorothea Lange -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
