300mm plus Lens Club: discuss your long lenses

Mike.P® · 06-06-2010, 12:54 PM - **1 Like**

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Pentax 300mm f4.5 and 1.7x AF teleconverter.

kacansas03 · 06-06-2010, 01:28 PM

With that 1.7 AF teleconverter are you losing 1.5 stops of light or less? The old formula I know is 1.4X tele = loose 1 stop, 2X Tele loose 2 stops. Someone recently wrote that my 1.5X tele from Kenko has me loose just over 1 stop, like 1.3 or 1.25 stops. I hope some one knows the answer to this question.

Mike.P® · 06-06-2010, 02:35 PM

Originally posted by kacansas03

With that 1.7 AF teleconverter are you losing 1.5 stops of light or less? The old formula I know is 1.4X tele = loose 1 stop, 2X Tele loose 2 stops. Someone recently wrote that my 1.5X tele from Kenko has me loose just over 1 stop, like 1.3 or 1.25 stops. I hope some one knows the answer to this question.

My 300mm f4.5 jumps to f8 minimum with the 1.7x

iFoto · 06-07-2010, 03:41 AM

Pentax A*600/5.6 ED IF + Teleconverter 2XL
for sale in the german pentax forum
DigitalFotoNetz.de :: Thema anzeigen - Pentax A*600 ED IF

and a PENTAX A* 300mm f/2.8 ED IF
japan e-bay shop
smc PENTAX A* 300mm f/2.8 ED IF Excellent bei eBay.de: Lenses (endet 03.07.10 07:00:40 MESZ)

**dadipentak** · 06-07-2010, 08:38 AM

Originally posted by iFoto

Pentax A*600/5.6 ED IF + Teleconverter 2XL
for sale in the german pentax forum

Mein Gott!

siva.ss.kumar · 06-07-2010, 10:01 AM

Originally posted by dadipentak

Mein Gott!

Exactly. I guess, at these prices, I can't afford in a thousand years. Guess, I have to be satisfied with 300/4

A*300/2.8 for about USD 1250 anyone?

8540tomg · 06-07-2010, 02:40 PM - **2 Likes**

I posted these elsewhere but they seem to fit here as well.

Female Red Wing Black Bird

Male of same species.

Tom G

**ChipB** · 06-07-2010, 03:44 PM

Very nice Tom! I'm really impressed!

**dadipentak** · 06-07-2010, 03:51 PM

I really like those, Tom--rich color and great resolution!

borno · 06-07-2010, 05:10 PM

Nice RWBB's Tom

8540tomg · 06-07-2010, 07:05 PM

Chip, Dave, Borno

Thanks for the kind words.

Tom G

siva.ss.kumar · 06-07-2010, 09:27 PM

Very sharp pics Tom. Could you tell us what were the settings when you took the pictures.
I find that with Bigma, in low light (cloudy sky or inside of the forest where all you get is filtered sun light), either you get shakes or soft images.

8540tomg · 06-08-2010, 04:27 AM

Originally posted by siva.ss.kumar

Very sharp pics Tom. Could you tell us what were the settings when you took the pictures.
I find that with Bigma, in low light (cloudy sky or inside of the forest where all you get is filtered sun light), either you get shakes or soft images.

Siva,

Sure. I always shoot at ISO 100 with the K10 mounted on a monopod. Shutter speed was 1/200 sec at between f 8 and f 11. I always shoot with the sun at my back with this lens as experience indicates I’ll get the best results and less PF. As I recall it was mid afternoon and a fairly sunny day. I adjusted the setting on the K10 accordingly.

Tom G

**dadipentak** · 06-08-2010, 10:20 AM

Originally posted by 8540tomg

I always shoot with the sun at my back ... as experience indicates I’ll get the best results and less PF.

I'd add "whenever possible" and Amen!" ;~)

Jewelltrail · 06-08-2010, 10:45 AM

Quote:

8540tomg: I posted these elsewhere but they seem to fit here as well.

Female Red Wing Black Bird

SOOOPER DOOOOOPER shot!

06-07-2010, 02:40 PM - 2 Likes	#637
8540tomg Veteran Member Join Date: Feb 2008 Location: Waterloo, Ontario Photos: Gallery Posts: 4,461	SMC Pentax M 400/5.6 I posted these elsewhere but they seem to fit here as well. Female Red Wing Black Bird Male of same species. Tom G

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06-06-2010, 12:54 PM - 1 Like	#631
Mike.P® Veteran Member Join Date: Mar 2008 Location: New Milton, Hampshire, UK Photos: Gallery \| Albums Posts: 2,154	Staff note: This post may contain affiliate links, which means Pentax Forums may earn a small commission if a visitor clicks through and makes a purchase. If you would like to support the forum directly, you may also make a donation here. Pentax 300mm f4.5 and 1.7x AF teleconverter.

06-06-2010, 01:28 PM	#632
kacansas03 Veteran Member Join Date: Dec 2008 Location: Twin Cities, Minnesota Photos: Albums Posts: 650	With that 1.7 AF teleconverter are you losing 1.5 stops of light or less? The old formula I know is 1.4X tele = loose 1 stop, 2X Tele loose 2 stops. Someone recently wrote that my 1.5X tele from Kenko has me loose just over 1 stop, like 1.3 or 1.25 stops. I hope some one knows the answer to this question.

06-06-2010, 02:35 PM	#633
Mike.P® Veteran Member Join Date: Mar 2008 Location: New Milton, Hampshire, UK Photos: Gallery \| Albums Posts: 2,154	Originally posted by kacansas03 With that 1.7 AF teleconverter are you losing 1.5 stops of light or less? The old formula I know is 1.4X tele = loose 1 stop, 2X Tele loose 2 stops. Someone recently wrote that my 1.5X tele from Kenko has me loose just over 1 stop, like 1.3 or 1.25 stops. I hope some one knows the answer to this question. My 300mm f4.5 jumps to f8 minimum with the 1.7x

06-07-2010, 03:41 AM	#634
iFoto Senior Member Join Date: Feb 2008 Photos: Gallery \| Albums Posts: 177	Pentax A600/5.6 ED IF + Teleconverter 2XL for sale in the german pentax forum DigitalFotoNetz.de :: Thema anzeigen - Pentax A600 ED IF and a PENTAX A* 300mm f/2.8 ED IF japan e-bay shop smc PENTAX A* 300mm f/2.8 ED IF Excellent bei eBay.de: Lenses (endet 03.07.10 07:00:40 MESZ)

06-07-2010, 08:38 AM	#635
dadipentak Site Supporter Join Date: Jul 2008 Location: Baltimore, Maryland Photos: Gallery Posts: 11,590	Originally posted by iFoto Pentax A*600/5.6 ED IF + Teleconverter 2XL for sale in the german pentax forum Mein Gott!

06-07-2010, 10:01 AM	#636
siva.ss.kumar Pentaxian Join Date: Jan 2008 Location: Chennai, India Photos: Albums Posts: 534	Originally posted by dadipentak Mein Gott! Exactly. I guess, at these prices, I can't afford in a thousand years. Guess, I have to be satisfied with 300/4 A*300/2.8 for about USD 1250 anyone?

06-07-2010, 03:44 PM	#638
ChipB Site Supporter Join Date: Nov 2007 Location: Eau Claire, WI Photos: Gallery \| Albums Posts: 2,701	Very nice Tom! I'm really impressed!

06-07-2010, 03:51 PM	#639
dadipentak Site Supporter Join Date: Jul 2008 Location: Baltimore, Maryland Photos: Gallery Posts: 11,590	I really like those, Tom--rich color and great resolution!

06-07-2010, 05:10 PM	#640
borno Veteran Member Join Date: Nov 2006 Location: md-usa Photos: Gallery \| Albums Posts: 2,580	Nice RWBB's Tom

06-07-2010, 07:05 PM	#641
8540tomg Veteran Member Join Date: Feb 2008 Location: Waterloo, Ontario Photos: Gallery Posts: 4,461	Chip, Dave, Borno Thanks for the kind words. Tom G

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06-07-2010, 09:27 PM	#642
siva.ss.kumar Pentaxian Join Date: Jan 2008 Location: Chennai, India Photos: Albums Posts: 534	Very sharp pics Tom. Could you tell us what were the settings when you took the pictures. I find that with Bigma, in low light (cloudy sky or inside of the forest where all you get is filtered sun light), either you get shakes or soft images.

06-08-2010, 04:27 AM	#643
8540tomg Veteran Member Join Date: Feb 2008 Location: Waterloo, Ontario Photos: Gallery Posts: 4,461	Originally posted by siva.ss.kumar Very sharp pics Tom. Could you tell us what were the settings when you took the pictures. I find that with Bigma, in low light (cloudy sky or inside of the forest where all you get is filtered sun light), either you get shakes or soft images. Siva, Sure. I always shoot at ISO 100 with the K10 mounted on a monopod. Shutter speed was 1/200 sec at between f 8 and f 11. I always shoot with the sun at my back with this lens as experience indicates I’ll get the best results and less PF. As I recall it was mid afternoon and a fairly sunny day. I adjusted the setting on the K10 accordingly. Tom G

06-08-2010, 10:20 AM	#644
dadipentak Site Supporter Join Date: Jul 2008 Location: Baltimore, Maryland Photos: Gallery Posts: 11,590	Originally posted by 8540tomg I always shoot with the sun at my back ... as experience indicates I’ll get the best results and less PF. I'd add "whenever possible" and Amen!" ;~)

06-08-2010, 10:45 AM	#645
Jewelltrail Veteran Member Join Date: May 2008 Location: Rhode Island Photos: Albums Posts: 4,180	Quote: 8540tomg: I posted these elsewhere but they seem to fit here as well. Female Red Wing Black Bird SOOOPER DOOOOOPER shot!