Pentax 300mm f4 A* with 1.4 X extender

gurtch · 07-17-2011, 08:28 AM

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.
Best
Dave

gurtch · 07-17-2011, 08:32 AM

I'll try again:

Yamanobori · 07-17-2011, 08:49 AM

Thanks. Interesting that the camera should the right f-number with compensation with the extender but the exif data does not.

**DigiMack** · 07-17-2011, 12:20 PM

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.

gurtch · 07-17-2011, 03:47 PM

Originally posted by Yamanobori

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

goddo31 · 07-17-2011, 10:58 PM

Originally posted by DigiMack

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.

07-17-2011, 08:28 AM	#1
gurtch Senior Member Join Date: Nov 2010 Location: Beach Haven, NJ Posts: 176	*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. Best Dave

07-17-2011, 08:32 AM	#2
gurtch Senior Member Join Date: Nov 2010 Location: Beach Haven, NJ Posts: 176 Original Poster	I'll try again: Attached Images

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07-17-2011, 08:49 AM	#3
Yamanobori Veteran Member Join Date: Feb 2011 Photos: Gallery Posts: 573	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
DigiMack Site Supporter Join Date: Dec 2010 Posts: 169	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
gurtch Senior Member Join Date: Nov 2010 Location: Beach Haven, NJ Posts: 176 Original Poster	Originally posted by Yamanobori 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
goddo31 Veteran Member Join Date: Feb 2009 Location: Perth, Western Australia Photos: Gallery \| Albums Posts: 2,576	Originally posted by DigiMack 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 FA300mm 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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