I would go for the Swaro's or a second hand Zeiss Victory, the Victory glass is far better than the Diralyt these are cheap for one reason the glass is no as good, As for 25 mm or 30 mm i dont think it makes much difference to light, but i purchased 30 mm just incase it did.
DS
Sounds a bit odd - why would they perform worse on a moderated rifle than one without ?I own both these scopes.
I can tell you that 30mm tubes only afford a greater zoom range than 25mm and light transmission is not relevant.Hence the Zeiss being 3-12 and the Swaro being 4-12.
If I were to buy either of these scopes again I would buy the Zeiss. I have had Swaro scopes for 20 yrs but recently have lost confidence in the brand.
McLeods of Tain tell me they are getting huge numbers of returned Swaro scopes not holding zero on moderated rifles. My new 4-12 Swaro was returned twice for this.
The Zeiss Duralyt is a new model, hopefully designed to perform on moderated rifles(as most now are)and up to date mine is faultless.
S.
Is that based on experience with the Duralyt ? Not had a chance to look through one yet but interested to see what they are like , i have chosen Zeiss over Swarovski in the past but not had a chance to compare their latest offerings head to head in the field (and looking through them in a shop is no substitute ).
The 30mm tube is unlikely to increase percieved light transmission through the tube , but it will most likely be stronger and have a wider adjustment range for windage / elevation.
Sounds a bit odd - why would they perform worse on a moderated rifle than one without ?
A moderator will soak up some recoil - thus reducing 'shock' to the scope , unless of course the symptoms are actually worse on unmoderated rifles as an untold part of the story .
Agreed that the recoil does not disappear - but it is reduced , i have read the physics on it - but a bit beyond me , however it is fact that the recoil is reduced by a moderator - my own shoulder will bear witness to this , moderators and muzzle brakes are routinely used to reduce muzzle flip and tame the recoil on the monster calibres .A moderator doesn't make the recoil just disappear as such but the energy is exchanged in a different way- newton's 3rd law and all that. I assume it is this type of recoil that the scopes are not designed to withstand as they are used to a simple backwards recoil.
However do correct me if i have been misinformed.
George
Agreed that the recoil does not disappear - but it is reduced , i have read the physics on it - but a bit beyond me , however it is fact that the recoil is reduced by a moderator - my own shoulder will bear witness to this , moderators and muzzle brakes are routinely used to reduce muzzle flip and tame the recoil on the monster calibres .
This is why i am interested to know why rifles equipped with moderators have been identified as a cause of a problem with zero shift on Swarovski scopes , a rifle that is recoiling less should be causing less problems not more .A moderator on a centrefire rifle would not cause a different type of recoil - just less , for a different type of recoil look at springer airguns - the recoil is fore and aft - caused by the forward impact / energy of the spring and the 'standard' recoil caused by the pellet leaving the muzzle , known to reduce less well built scopes to a pile of parts .
You are right , the energy produced cannot simply disappear, but the direction of movement that this energy causes to the rifle may be changed (and this may well be the reasoning behind the claims / possible effect to a scope ).Once again the recoil is reduced hugely my shoulder would also bare witness to this but the energy that causes the recoil doesn't disappear, it can't. It is simply converted into another form of energy thats physics, energy can't be created or destroyed it just changes form or so GCSE physics taught me any way. The energy must simply be exerted in a different way quite how that is i am not sure but it does it none the less and i did read it somewhere how the energy from the round is change but i forget. Anyway i think the reason that scopes struggle with the moderator is that the way the energy is transferred is not the way that scopes are designed to withstand and this is why it is meant to be causing problems.
George
Is that based on experience with the Duralyt ? Not had a chance to look through one yet but interested to see what they are like , i have chosen Zeiss over Swarovski in the past but not had a chance to compare their latest offerings head to head in the field (and looking through them in a shop is no substitute ).
The 30mm tube is unlikely to increase percieved light transmission through the tube , but it will most likely be stronger and have a wider adjustment range for windage / elevation.