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07-17-2011, 08:28 AM   #1
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Pentax 300mm f4 A* with 1.4 X extender

I tested my 300mm A* today with and without 1.4 X Dedicated extender. I am very pleased with the sharpness. Shutter priority at 1/400 sec. Camera selected f13 (reads f9 in data because of extender). First is a small jpg of entire frame. Second is a crop at actual pixels with 1.4X on the lens.
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Dave

07-17-2011, 08:32 AM   #2
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I'll try again:
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07-17-2011, 08:49 AM   #3
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Thanks. Interesting that the camera should the right f-number with compensation with the extender but the exif data does not.
07-17-2011, 12:20 PM   #4
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Thanks for the post Dave, and for sharing the shot. The DA300mm f/4 is a lens I have been contemplating on getting with an extender, but I always seem to wait just a little-bit longer in hopes that a FA*300mm f/2.8 will show up. Oh well, dreams are nice.

07-17-2011, 03:47 PM   #5
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QuoteOriginally posted by Yamanobori Quote
Thanks. Interesting that the camera should the right f-number with compensation with the extender but the exif data does not.
I made an error in my statement. I used shutter Priority at 1/400 sec. Without the extender the EXIF data shows f13. With the extender, the EXIF data shows f9. Both apeatures were camera selected. I did not bothre to post shots without the extender, because, quite frankly, I could see no difference in sharpness at 100%. I did not use mirror lock up as I was manually focus following as the boat moved. I did use lock up on a stationary object, but at 1/400 I saw no difference.
Dave
07-17-2011, 10:58 PM   #6
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QuoteOriginally posted by DigiMack Quote
Thanks for the post Dave, and for sharing the shot. The DA300mm f/4 is a lens I have been contemplating on getting with an extender, but I always seem to wait just a little-bit longer in hopes that a FA*300mm f/2.8 will show up. Oh well, dreams are nice.
I think maybe you are getting confused. This thread is about the A* 300 on the 645 format.
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