Super-telephoto a pipe dream on Pentax FF?

desert-tiger · 02-13-2018, 10:05 AM

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Well I have a k5 and the K1 and of course i can use the k1 on crap mode with my 15-450 but what about this Tamron-F AF Tele-Converter 1.4X Pz-AF MC4 Teleconverter for Pentax K KAF3 Mount | eBay

**dadipentak** · 02-13-2018, 11:31 AM

Originally posted by desert-tiger

but what about this Tamron-F AF Tele-Converter 1.4xPZ-AF MC4?

I've been using one for years (with A*400/2.8, FA*300/2.8, F*600/4 & DA*300/4) and have been quite pleased.

Ian Stuart Forsyth · 02-13-2018, 07:09 PM

Originally posted by normhead

You do realize that a 22% increase in resolution is the difference between 400mm lens and a 500mm lens?

And do you realize that the difference 1.22 crop factor will only narrow FOV going from 400mm to 488mm, for wildlife photography that sits near the bottom on my concerns when I go out and photograph

normhead · 02-13-2018, 07:55 PM

Originally posted by Ian Stuart Forsyth

And do you realize that the difference 1.22 crop factor will only narrow FOV going from 400mm to 488mm, for wildlife photography that sits near the bottom on my concerns when I go out and photograph

Ya right, so you're saying forget that 500mm lens, just buy a 400, it's the same according to you. How do Nikon and Canon sell all those 500mm and 600mm lenses then if all you need is 400mm and it's just as good. You'd think long glass would be extinct by now.

These people don't agree, but hey whatever.

Who's to be believed here? Ian, or all these folks?

Don't go getting stupid on me here Ian. Especially in birding, you never have long enough and 400 is too short. 500 is barely adequate, a 600 ƒ4 with a 1.4 on it is quite nice.I know you like to "win" these discussions that that was pretty lame even for you.

Last edited by normhead; 02-13-2018 at 08:00 PM.

Ian Stuart Forsyth · 02-13-2018, 08:50 PM

Originally posted by normhead

Don't go getting stupid on me here Ian. Especially in birding, you never have long enough and 400 is too short. 500 is barely adequate, a 600 ƒ4 with a 1.4 on it is quite nice.I know you like to "win" these discussions that that was pretty lame even for you.

Less than 10% of the wildlife photographs I have taken last 5 year was over 400mm on FF

take this one at 370mm, my regret with this photo is I should have went with 300m for better framing

One of my all time favorites was taken at 290mm on FF

There must be some inherent difficulty to shoot birds from bird feeds because you keep posting photographs as some testament to how hard they are to take, you might be right as I usually don't photograph wildlife around them.

And as far as winning these discussions, I know you can paint the snow yellow way more than I ever could, so you will winning these discussions is a given every time.

What I feel as really really lame is that everyone must photograph, use equipment, and think as how would Norm take this photograph. You must be right as you are the self appointed expert
I guess I'll have to start taking Bird photographs around the feeder to better understand you .

normhead · 02-14-2018, 07:18 AM

Whatever

02-13-2018, 11:31 AM	#62
dadipentak Site Supporter Join Date: Jul 2008 Location: Baltimore, Maryland Photos: Gallery Posts: 11,590	Originally posted by desert-tiger but what about this Tamron-F AF Tele-Converter 1.4xPZ-AF MC4? I've been using one for years (with A400/2.8, FA300/2.8, F600/4 & DA300/4) and have been quite pleased. Last edited by dadipentak; 02-13-2018 at 11:52 AM.

02-14-2018, 07:18 AM	#66
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,451	Whatever Last edited by normhead; 02-14-2018 at 08:13 AM.

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02-13-2018, 10:05 AM	#61
desert-tiger Junior Member Join Date: Mar 2013 Photos: Albums Posts: 47	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. Well I have a k5 and the K1 and of course i can use the k1 on crap mode with my 15-450 but what about this Tamron-F AF Tele-Converter 1.4X Pz-AF MC4 Teleconverter for Pentax K KAF3 Mount \| eBay

02-13-2018, 07:09 PM	#63
Ian Stuart Forsyth Pentaxian Join Date: May 2009 Location: Somewhere over the rainbow Photos: Gallery Posts: 1,531	Originally posted by normhead You do realize that a 22% increase in resolution is the difference between 400mm lens and a 500mm lens? And do you realize that the difference 1.22 crop factor will only narrow FOV going from 400mm to 488mm, for wildlife photography that sits near the bottom on my concerns when I go out and photograph

02-13-2018, 07:55 PM	#64
normhead Pentaxian Join Date: Jun 2007 Location: Near Algonquin Park Photos: Gallery \| Albums Posts: 40,451	Originally posted by Ian Stuart Forsyth And do you realize that the difference 1.22 crop factor will only narrow FOV going from 400mm to 488mm, for wildlife photography that sits near the bottom on my concerns when I go out and photograph Ya right, so you're saying forget that 500mm lens, just buy a 400, it's the same according to you. How do Nikon and Canon sell all those 500mm and 600mm lenses then if all you need is 400mm and it's just as good. You'd think long glass would be extinct by now. These people don't agree, but hey whatever. Who's to be believed here? Ian, or all these folks? Don't go getting stupid on me here Ian. Especially in birding, you never have long enough and 400 is too short. 500 is barely adequate, a 600 ƒ4 with a 1.4 on it is quite nice.I know you like to "win" these discussions that that was pretty lame even for you. Last edited by normhead; 02-13-2018 at 08:00 PM.

02-13-2018, 08:50 PM	#65
Ian Stuart Forsyth Pentaxian Join Date: May 2009 Location: Somewhere over the rainbow Photos: Gallery Posts: 1,531	Originally posted by normhead Don't go getting stupid on me here Ian. Especially in birding, you never have long enough and 400 is too short. 500 is barely adequate, a 600 ƒ4 with a 1.4 on it is quite nice.I know you like to "win" these discussions that that was pretty lame even for you. Less than 10% of the wildlife photographs I have taken last 5 year was over 400mm on FF take this one at 370mm, my regret with this photo is I should have went with 300m for better framing One of my all time favorites was taken at 290mm on FF There must be some inherent difficulty to shoot birds from bird feeds because you keep posting photographs as some testament to how hard they are to take, you might be right as I usually don't photograph wildlife around them. And as far as winning these discussions, I know you can paint the snow yellow way more than I ever could, so you will winning these discussions is a given every time. What I feel as really really lame is that everyone must photograph, use equipment, and think as how would Norm take this photograph. You must be right as you are the self appointed expert I guess I'll have to start taking Bird photographs around the feeder to better understand you .