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**mikesbike** · 10-05-2020, 05:01 PM

Originally posted by dlh

it tends to slide back in if it's pointed upwards (e.g., attempting to track birds in flight).

Oh, this is not good, and the DFA 150-450mm is a fairly recent design!!

**Ash** · 10-05-2020, 08:23 PM

Originally posted by MossyRocks

You are an evil temptress. Now I'm debating if I should even look at it or not.

All in good faith.

My contemplation over the lens quickly fizzled when I considered how rare I would have both the opportunity and the finances to justify it.
I've just settled on a 400/5.6 for now, until something like a snappy DFA 300/4 comes along...

**tduell** · 10-05-2020, 09:47 PM - **1 Like**

Originally posted by dlh

secondly, there's no way to lock the zooming part, which, if I have it extended towards the greater telephoto range, it tends to slide back in if it's pointed upwards (e.g., attempting to track birds in flight).

The zoom can creep when the lens is pointed up or down, more so when the lens has had a lot of use and the seals are less tight, but it won't/can't creep if you hold the zoom ring, which to me is a natural way of holding the lens and allows you to rapidly re-frame as required, so I'd say it's not an issue if hand holding.

Cheers,
Terry

**Ash** · 10-05-2020, 10:46 PM

As a pipedream, which of the two lenses would you want to see in a DFA?
300/4 or 300/2.8 (considering the extra weight and size it would have)?

angerdan · 10-06-2020, 02:29 AM

Originally posted by Ash

As a pipedream, which of the two lenses would you want to see in a DFA?
300/4 or 300/2.8
(considering the extra weight and size it would have)?

more an 400mm f4.x (like the Minolta) than the 300mm f2.8
recent/current lens designs are much more lightweight than 30 years ago when F/FA-lenses were on the market.
1987: Canon EF 300mm f/2.8L USM = 2855kg
2011: Canon EF 300mm f/2.8L IS II USM: 2440kg (-15%)

**Pål Jensen** · 10-06-2020, 02:50 AM

I think they should make slow DO super telephotos like Canon have.

**MossyRocks** · 10-06-2020, 06:30 AM

Originally posted by Ash

My contemplation over the lens quickly fizzled when I considered how rare I would have both the opportunity and the finances to justify it.

For astro it would be a good lens and I do a lot of astro shooting. Since I already have the 1.4X-L converter it becomes even more appealing. I did look and saw that it was pending sale so that takes the pressure off.

10-06-2020, 02:29 AM	#35
angerdan Pentaxian Join Date: Feb 2015 Photos: Gallery \| Albums Posts: 2,643	Originally posted by Ash As a pipedream, which of the two lenses would you want to see in a DFA? 300/4 or 300/2.8 (considering the extra weight and size it would have)? more an 400mm f4.x (like the Minolta) than the 300mm f2.8 recent/current lens designs are much more lightweight than 30 years ago when F/FA-lenses were on the market. 1987: Canon EF 300mm f/2.8L USM = 2855kg 2011: Canon EF 300mm f/2.8L IS II USM: 2440kg (-15%)

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10-05-2020, 05:01 PM	#31
mikesbike Site Supporter Join Date: Dec 2016 Location: Southeastern Michigan Posts: 4,562	Originally posted by dlh it tends to slide back in if it's pointed upwards (e.g., attempting to track birds in flight). Oh, this is not good, and the DFA 150-450mm is a fairly recent design!!

10-05-2020, 08:23 PM	#32
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920	Originally posted by MossyRocks You are an evil temptress. Now I'm debating if I should even look at it or not. All in good faith. My contemplation over the lens quickly fizzled when I considered how rare I would have both the opportunity and the finances to justify it. I've just settled on a 400/5.6 for now, until something like a snappy DFA 300/4 comes along...

10-05-2020, 09:47 PM - 1 Like	#33
tduell Loyal Site Supporter Join Date: May 2015 Location: Melbourne Posts: 1,517 Original Poster	Originally posted by dlh secondly, there's no way to lock the zooming part, which, if I have it extended towards the greater telephoto range, it tends to slide back in if it's pointed upwards (e.g., attempting to track birds in flight). The zoom can creep when the lens is pointed up or down, more so when the lens has had a lot of use and the seals are less tight, but it won't/can't creep if you hold the zoom ring, which to me is a natural way of holding the lens and allows you to rapidly re-frame as required, so I'd say it's not an issue if hand holding. Cheers, Terry

10-05-2020, 10:46 PM	#34
Ash Loyal Site Supporter Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,920	As a pipedream, which of the two lenses would you want to see in a DFA? 300/4 or 300/2.8 (considering the extra weight and size it would have)?

10-06-2020, 02:50 AM	#36
Pål Jensen Site Supporter Join Date: Dec 2007 Location: Norway Photos: Albums Posts: 4,371	I think they should make slow DO super telephotos like Canon have.

10-06-2020, 06:30 AM	#37
MossyRocks Loyal Site Supporter Join Date: Nov 2017 Location: Minnesota Photos: Gallery \| Albums Posts: 2,982	Originally posted by Ash My contemplation over the lens quickly fizzled when I considered how rare I would have both the opportunity and the finances to justify it. For astro it would be a good lens and I do a lot of astro shooting. Since I already have the 1.4X-L converter it becomes even more appealing. I did look and saw that it was pending sale so that takes the pressure off.

I would like an updated DA*300

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